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Sema: enhance div_trunc, div_exact, div_floor
* No longer emit div_exact AIR instruction that can produce a remainder, invoking undefined behavior. * div_trunc, div_exact, div_floor are extracted from analyzeArithmetic and directly handled similarly to div_trunc, integrating them with integer overflow safety checking. * Also they no longer emit divide-by-zero safety checking when RHS is comptime known to be non-zero.
This commit is contained in:
Andrew Kelley
parent
1fc24e8d80
commit
40f8f0134f
@ -111,8 +111,9 @@ pub const Inst = struct {
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div_floor,
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/// Same as `div_floor` with optimized float mode.
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div_floor_optimized,
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/// Integer or float division. Guaranteed no remainder.
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/// For integers, wrapping is undefined behavior.
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/// Integer or float division.
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/// If a remainder would be produced, undefined behavior occurs.
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/// For integers, overflow is undefined behavior.
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/// Both operands are guaranteed to be the same type, and the result type
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/// is the same as both operands.
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/// Uses the `bin_op` field.
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853
src/Sema.zig
853
src/Sema.zig
@ -875,10 +875,6 @@ fn analyzeBodyInner(
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.add => try sema.zirArithmetic(block, inst, .add),
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.addwrap => try sema.zirArithmetic(block, inst, .addwrap),
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.add_sat => try sema.zirArithmetic(block, inst, .add_sat),
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.div => try sema.zirDiv(block, inst),
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.div_exact => try sema.zirArithmetic(block, inst, .div_exact),
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.div_floor => try sema.zirArithmetic(block, inst, .div_floor),
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.div_trunc => try sema.zirArithmetic(block, inst, .div_trunc),
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.mod_rem => try sema.zirArithmetic(block, inst, .mod_rem),
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.mod => try sema.zirArithmetic(block, inst, .mod),
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.rem => try sema.zirArithmetic(block, inst, .rem),
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@ -889,6 +885,11 @@ fn analyzeBodyInner(
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.subwrap => try sema.zirArithmetic(block, inst, .subwrap),
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.sub_sat => try sema.zirArithmetic(block, inst, .sub_sat),
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.div => try sema.zirDiv(block, inst),
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.div_exact => try sema.zirDivExact(block, inst),
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.div_floor => try sema.zirDivFloor(block, inst),
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.div_trunc => try sema.zirDivTrunc(block, inst),
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.maximum => try sema.zirMinMax(block, inst, .max),
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.minimum => try sema.zirMinMax(block, inst, .min),
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@ -10999,6 +11000,7 @@ fn zirDiv(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.Ins
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if (try rhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
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return sema.failWithDivideByZero(block, rhs_src);
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}
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// TODO: if the RHS is one, return the LHS directly
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}
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},
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else => {},
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@ -11041,105 +11043,8 @@ fn zirDiv(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.Ins
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try sema.requireRuntimeBlock(block, src, runtime_src);
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if (block.wantSafety()) {
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int_overflow: {
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if (!is_int) break :int_overflow;
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// If the LHS is unsigned, it cannot cause overflow.
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if (!lhs_scalar_ty.isSignedInt()) break :int_overflow;
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// If the LHS is widened to a larger integer type, no overflow is possible.
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if (lhs_scalar_ty.intInfo(target).bits < resolved_type.intInfo(target).bits) {
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break :int_overflow;
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}
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const min_int = try resolved_type.minInt(sema.arena, target);
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const neg_one = try Value.Tag.int_i64.create(sema.arena, -1);
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// If the LHS is comptime-known to be not equal to the min int,
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// no overflow is possible.
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if (maybe_lhs_val) |lhs_val| {
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if (!lhs_val.compare(.eq, min_int, resolved_type, mod)) break :int_overflow;
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}
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// If the RHS is comptime-known to not be equal to -1, no overflow is possible.
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if (maybe_rhs_val) |rhs_val| {
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if (!rhs_val.compare(.eq, neg_one, resolved_type, mod)) break :int_overflow;
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}
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var ok: Air.Inst.Ref = .none;
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if (resolved_type.zigTypeTag() == .Vector) {
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const vector_ty_ref = try sema.addType(resolved_type);
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if (maybe_lhs_val == null) {
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const min_int_ref = try sema.addConstant(
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resolved_type,
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try Value.Tag.repeated.create(sema.arena, min_int),
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);
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ok = try block.addCmpVector(casted_lhs, min_int_ref, .neq, vector_ty_ref);
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}
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if (maybe_rhs_val == null) {
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const neg_one_ref = try sema.addConstant(
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resolved_type,
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try Value.Tag.repeated.create(sema.arena, neg_one),
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);
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const rhs_ok = try block.addCmpVector(casted_rhs, neg_one_ref, .neq, vector_ty_ref);
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if (ok == .none) {
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ok = rhs_ok;
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} else {
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ok = try block.addBinOp(.bool_or, ok, rhs_ok);
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}
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}
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assert(ok != .none);
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ok = try block.addInst(.{
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.tag = .reduce,
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.data = .{ .reduce = .{
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.operand = ok,
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.operation = .And,
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} },
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});
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} else {
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if (maybe_lhs_val == null) {
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const min_int_ref = try sema.addConstant(resolved_type, min_int);
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ok = try block.addBinOp(.cmp_neq, casted_lhs, min_int_ref);
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}
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if (maybe_rhs_val == null) {
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const neg_one_ref = try sema.addConstant(resolved_type, neg_one);
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const rhs_ok = try block.addBinOp(.cmp_neq, casted_rhs, neg_one_ref);
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if (ok == .none) {
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ok = rhs_ok;
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} else {
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ok = try block.addBinOp(.bool_or, ok, rhs_ok);
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}
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}
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assert(ok != .none);
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}
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try sema.addSafetyCheck(block, ok, .integer_overflow);
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}
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div_by_zero: {
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// Strict IEEE floats have well-defined division by zero.
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if (!is_int and block.float_mode == .Strict) break :div_by_zero;
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// If rhs was comptime-known to be zero a compile error would have been
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// emitted above.
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if (maybe_rhs_val != null) break :div_by_zero;
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const ok = if (resolved_type.zigTypeTag() == .Vector) ok: {
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const zero_val = try Value.Tag.repeated.create(sema.arena, Value.zero);
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const zero = try sema.addConstant(resolved_type, zero_val);
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const ok = try block.addCmpVector(casted_rhs, zero, .neq, try sema.addType(resolved_type));
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break :ok try block.addInst(.{
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.tag = if (is_int) .reduce else .reduce_optimized,
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.data = .{ .reduce = .{
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.operand = ok,
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.operation = .And,
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} },
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});
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} else ok: {
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const zero = try sema.addConstant(resolved_type, Value.zero);
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break :ok try block.addBinOp(if (is_int) .cmp_neq else .cmp_neq_optimized, casted_rhs, zero);
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};
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try sema.addSafetyCheck(block, ok, .divide_by_zero);
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}
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try sema.addDivIntOverflowSafety(block, resolved_type, lhs_scalar_ty, maybe_lhs_val, maybe_rhs_val, casted_lhs, casted_rhs, is_int);
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try sema.addDivByZeroSafety(block, resolved_type, maybe_rhs_val, casted_rhs, is_int);
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}
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const air_tag = if (is_int) Air.Inst.Tag.div_trunc else switch (block.float_mode) {
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@ -11149,6 +11054,497 @@ fn zirDiv(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.Ins
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return block.addBinOp(air_tag, casted_lhs, casted_rhs);
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}
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fn zirDivExact(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.Inst.Ref {
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const inst_data = sema.code.instructions.items(.data)[inst].pl_node;
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const src: LazySrcLoc = .{ .node_offset_bin_op = inst_data.src_node };
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const lhs_src: LazySrcLoc = .{ .node_offset_bin_lhs = inst_data.src_node };
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const rhs_src: LazySrcLoc = .{ .node_offset_bin_rhs = inst_data.src_node };
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const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
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const lhs = try sema.resolveInst(extra.lhs);
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const rhs = try sema.resolveInst(extra.rhs);
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const lhs_ty = sema.typeOf(lhs);
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const rhs_ty = sema.typeOf(rhs);
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const lhs_zig_ty_tag = try lhs_ty.zigTypeTagOrPoison();
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const rhs_zig_ty_tag = try rhs_ty.zigTypeTagOrPoison();
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try sema.checkVectorizableBinaryOperands(block, src, lhs_ty, rhs_ty, lhs_src, rhs_src);
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try sema.checkInvalidPtrArithmetic(block, src, lhs_ty, .div_exact);
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const instructions = &[_]Air.Inst.Ref{ lhs, rhs };
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const resolved_type = try sema.resolvePeerTypes(block, src, instructions, .{
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.override = &[_]LazySrcLoc{ lhs_src, rhs_src },
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});
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const casted_lhs = try sema.coerce(block, resolved_type, lhs, lhs_src);
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const casted_rhs = try sema.coerce(block, resolved_type, rhs, rhs_src);
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const lhs_scalar_ty = lhs_ty.scalarType();
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const scalar_tag = resolved_type.scalarType().zigTypeTag();
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const is_int = scalar_tag == .Int or scalar_tag == .ComptimeInt;
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try sema.checkArithmeticOp(block, src, scalar_tag, lhs_zig_ty_tag, rhs_zig_ty_tag, .div_exact);
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const mod = sema.mod;
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const target = mod.getTarget();
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const maybe_lhs_val = try sema.resolveMaybeUndefValIntable(block, lhs_src, casted_lhs);
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const maybe_rhs_val = try sema.resolveMaybeUndefValIntable(block, rhs_src, casted_rhs);
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const runtime_src = rs: {
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// For integers:
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// If the lhs is zero, then zero is returned regardless of rhs.
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// If the rhs is zero, compile error for division by zero.
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// If the rhs is undefined, compile error because there is a possible
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// value (zero) for which the division would be illegal behavior.
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// If the lhs is undefined, compile error because there is a possible
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// value for which the division would result in a remainder.
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// TODO: emit runtime safety for if there is a remainder
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// TODO: emit runtime safety for division by zero
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//
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// For floats:
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// If the rhs is zero, compile error for division by zero.
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// If the rhs is undefined, compile error because there is a possible
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// value (zero) for which the division would be illegal behavior.
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// If the lhs is undefined, compile error because there is a possible
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// value for which the division would result in a remainder.
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if (maybe_lhs_val) |lhs_val| {
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if (lhs_val.isUndef()) {
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return sema.failWithUseOfUndef(block, rhs_src);
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} else {
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if (try lhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
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return sema.addConstant(resolved_type, Value.zero);
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}
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}
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}
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if (maybe_rhs_val) |rhs_val| {
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if (rhs_val.isUndef()) {
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return sema.failWithUseOfUndef(block, rhs_src);
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}
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if (try rhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
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return sema.failWithDivideByZero(block, rhs_src);
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}
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// TODO: if the RHS is one, return the LHS directly
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}
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if (maybe_lhs_val) |lhs_val| {
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if (maybe_rhs_val) |rhs_val| {
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if (is_int) {
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// TODO: emit compile error if there is a remainder
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return sema.addConstant(
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resolved_type,
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try lhs_val.intDiv(rhs_val, resolved_type, sema.arena, target),
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);
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} else {
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// TODO: emit compile error if there is a remainder
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return sema.addConstant(
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resolved_type,
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try lhs_val.floatDiv(rhs_val, resolved_type, sema.arena, target),
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);
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}
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} else break :rs rhs_src;
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} else break :rs lhs_src;
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};
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try sema.requireRuntimeBlock(block, src, runtime_src);
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// Depending on whether safety is enabled, we will have a slightly different strategy
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// here. The `div_exact` AIR instruction causes undefined behavior if a remainder
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// is produced, so in the safety check case, it cannot be used. Instead we do a
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// div_trunc and check for remainder.
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if (block.wantSafety()) {
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try sema.addDivIntOverflowSafety(block, resolved_type, lhs_scalar_ty, maybe_lhs_val, maybe_rhs_val, casted_lhs, casted_rhs, is_int);
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try sema.addDivByZeroSafety(block, resolved_type, maybe_rhs_val, casted_rhs, is_int);
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const result = try block.addBinOp(.div_trunc, casted_lhs, casted_rhs);
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const ok = if (!is_int) ok: {
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const floored = try block.addUnOp(.floor, result);
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if (resolved_type.zigTypeTag() == .Vector) {
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const eql = try block.addCmpVector(result, floored, .eq, try sema.addType(resolved_type));
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break :ok try block.addInst(.{
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.tag = switch (block.float_mode) {
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.Strict => .reduce,
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.Optimized => .reduce_optimized,
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},
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.data = .{ .reduce = .{
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.operand = eql,
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.operation = .And,
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} },
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});
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} else {
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const is_in_range = try block.addBinOp(switch (block.float_mode) {
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.Strict => .cmp_eq,
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.Optimized => .cmp_eq_optimized,
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}, result, floored);
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break :ok is_in_range;
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}
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} else ok: {
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const remainder = try block.addBinOp(.rem, casted_lhs, casted_rhs);
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if (resolved_type.zigTypeTag() == .Vector) {
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const zero_val = try Value.Tag.repeated.create(sema.arena, Value.zero);
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const zero = try sema.addConstant(resolved_type, zero_val);
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const eql = try block.addCmpVector(remainder, zero, .eq, try sema.addType(resolved_type));
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break :ok try block.addInst(.{
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.tag = .reduce,
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.data = .{ .reduce = .{
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.operand = eql,
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.operation = .And,
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} },
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});
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} else {
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const zero = try sema.addConstant(resolved_type, Value.zero);
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const is_in_range = try block.addBinOp(.cmp_eq, remainder, zero);
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break :ok is_in_range;
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}
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};
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try sema.addSafetyCheck(block, ok, .exact_division_remainder);
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return result;
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}
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return block.addBinOp(airTag(block, is_int, .div_exact, .div_exact_optimized), casted_lhs, casted_rhs);
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}
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fn zirDivFloor(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.Inst.Ref {
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const inst_data = sema.code.instructions.items(.data)[inst].pl_node;
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const src: LazySrcLoc = .{ .node_offset_bin_op = inst_data.src_node };
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const lhs_src: LazySrcLoc = .{ .node_offset_bin_lhs = inst_data.src_node };
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const rhs_src: LazySrcLoc = .{ .node_offset_bin_rhs = inst_data.src_node };
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const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
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const lhs = try sema.resolveInst(extra.lhs);
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const rhs = try sema.resolveInst(extra.rhs);
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const lhs_ty = sema.typeOf(lhs);
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const rhs_ty = sema.typeOf(rhs);
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const lhs_zig_ty_tag = try lhs_ty.zigTypeTagOrPoison();
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const rhs_zig_ty_tag = try rhs_ty.zigTypeTagOrPoison();
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try sema.checkVectorizableBinaryOperands(block, src, lhs_ty, rhs_ty, lhs_src, rhs_src);
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try sema.checkInvalidPtrArithmetic(block, src, lhs_ty, .div_floor);
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const instructions = &[_]Air.Inst.Ref{ lhs, rhs };
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const resolved_type = try sema.resolvePeerTypes(block, src, instructions, .{
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.override = &[_]LazySrcLoc{ lhs_src, rhs_src },
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});
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const casted_lhs = try sema.coerce(block, resolved_type, lhs, lhs_src);
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const casted_rhs = try sema.coerce(block, resolved_type, rhs, rhs_src);
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const lhs_scalar_ty = lhs_ty.scalarType();
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const rhs_scalar_ty = rhs_ty.scalarType();
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const scalar_tag = resolved_type.scalarType().zigTypeTag();
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const is_int = scalar_tag == .Int or scalar_tag == .ComptimeInt;
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try sema.checkArithmeticOp(block, src, scalar_tag, lhs_zig_ty_tag, rhs_zig_ty_tag, .div_floor);
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const mod = sema.mod;
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const target = mod.getTarget();
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const maybe_lhs_val = try sema.resolveMaybeUndefValIntable(block, lhs_src, casted_lhs);
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const maybe_rhs_val = try sema.resolveMaybeUndefValIntable(block, rhs_src, casted_rhs);
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const runtime_src = rs: {
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// For integers:
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// If the lhs is zero, then zero is returned regardless of rhs.
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// If the rhs is zero, compile error for division by zero.
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// If the rhs is undefined, compile error because there is a possible
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// value (zero) for which the division would be illegal behavior.
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// If the lhs is undefined:
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// * if lhs type is signed:
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// * if rhs is comptime-known and not -1, result is undefined
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// * if rhs is -1 or runtime-known, compile error because there is a
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// possible value (-min_int / -1) for which division would be
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// illegal behavior.
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// * if lhs type is unsigned, undef is returned regardless of rhs.
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// TODO: emit runtime safety for division by zero
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//
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// For floats:
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// If the rhs is zero, compile error for division by zero.
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// If the rhs is undefined, compile error because there is a possible
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// value (zero) for which the division would be illegal behavior.
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// If the lhs is undefined, result is undefined.
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if (maybe_lhs_val) |lhs_val| {
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if (!lhs_val.isUndef()) {
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if (try lhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
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return sema.addConstant(resolved_type, Value.zero);
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}
|
||||
}
|
||||
}
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (rhs_val.isUndef()) {
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
}
|
||||
if (try rhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
|
||||
return sema.failWithDivideByZero(block, rhs_src);
|
||||
}
|
||||
// TODO: if the RHS is one, return the LHS directly
|
||||
}
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (lhs_val.isUndef()) {
|
||||
if (lhs_scalar_ty.isSignedInt() and rhs_scalar_ty.isSignedInt()) {
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (try sema.compare(block, src, rhs_val, .neq, Value.negative_one, resolved_type)) {
|
||||
return sema.addConstUndef(resolved_type);
|
||||
}
|
||||
}
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
}
|
||||
return sema.addConstUndef(resolved_type);
|
||||
}
|
||||
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (is_int) {
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.intDivFloor(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
} else {
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.floatDivFloor(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
}
|
||||
} else break :rs rhs_src;
|
||||
} else break :rs lhs_src;
|
||||
};
|
||||
|
||||
try sema.requireRuntimeBlock(block, src, runtime_src);
|
||||
|
||||
if (block.wantSafety()) {
|
||||
try sema.addDivIntOverflowSafety(block, resolved_type, lhs_scalar_ty, maybe_lhs_val, maybe_rhs_val, casted_lhs, casted_rhs, is_int);
|
||||
try sema.addDivByZeroSafety(block, resolved_type, maybe_rhs_val, casted_rhs, is_int);
|
||||
}
|
||||
|
||||
return block.addBinOp(airTag(block, is_int, .div_floor, .div_floor_optimized), casted_lhs, casted_rhs);
|
||||
}
|
||||
|
||||
fn zirDivTrunc(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.Inst.Ref {
|
||||
const inst_data = sema.code.instructions.items(.data)[inst].pl_node;
|
||||
const src: LazySrcLoc = .{ .node_offset_bin_op = inst_data.src_node };
|
||||
const lhs_src: LazySrcLoc = .{ .node_offset_bin_lhs = inst_data.src_node };
|
||||
const rhs_src: LazySrcLoc = .{ .node_offset_bin_rhs = inst_data.src_node };
|
||||
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
|
||||
const lhs = try sema.resolveInst(extra.lhs);
|
||||
const rhs = try sema.resolveInst(extra.rhs);
|
||||
const lhs_ty = sema.typeOf(lhs);
|
||||
const rhs_ty = sema.typeOf(rhs);
|
||||
const lhs_zig_ty_tag = try lhs_ty.zigTypeTagOrPoison();
|
||||
const rhs_zig_ty_tag = try rhs_ty.zigTypeTagOrPoison();
|
||||
try sema.checkVectorizableBinaryOperands(block, src, lhs_ty, rhs_ty, lhs_src, rhs_src);
|
||||
try sema.checkInvalidPtrArithmetic(block, src, lhs_ty, .div_trunc);
|
||||
|
||||
const instructions = &[_]Air.Inst.Ref{ lhs, rhs };
|
||||
const resolved_type = try sema.resolvePeerTypes(block, src, instructions, .{
|
||||
.override = &[_]LazySrcLoc{ lhs_src, rhs_src },
|
||||
});
|
||||
|
||||
const casted_lhs = try sema.coerce(block, resolved_type, lhs, lhs_src);
|
||||
const casted_rhs = try sema.coerce(block, resolved_type, rhs, rhs_src);
|
||||
|
||||
const lhs_scalar_ty = lhs_ty.scalarType();
|
||||
const rhs_scalar_ty = rhs_ty.scalarType();
|
||||
const scalar_tag = resolved_type.scalarType().zigTypeTag();
|
||||
|
||||
const is_int = scalar_tag == .Int or scalar_tag == .ComptimeInt;
|
||||
|
||||
try sema.checkArithmeticOp(block, src, scalar_tag, lhs_zig_ty_tag, rhs_zig_ty_tag, .div_trunc);
|
||||
|
||||
const mod = sema.mod;
|
||||
const target = mod.getTarget();
|
||||
const maybe_lhs_val = try sema.resolveMaybeUndefValIntable(block, lhs_src, casted_lhs);
|
||||
const maybe_rhs_val = try sema.resolveMaybeUndefValIntable(block, rhs_src, casted_rhs);
|
||||
|
||||
const runtime_src = rs: {
|
||||
// For integers:
|
||||
// If the lhs is zero, then zero is returned regardless of rhs.
|
||||
// If the rhs is zero, compile error for division by zero.
|
||||
// If the rhs is undefined, compile error because there is a possible
|
||||
// value (zero) for which the division would be illegal behavior.
|
||||
// If the lhs is undefined:
|
||||
// * if lhs type is signed:
|
||||
// * if rhs is comptime-known and not -1, result is undefined
|
||||
// * if rhs is -1 or runtime-known, compile error because there is a
|
||||
// possible value (-min_int / -1) for which division would be
|
||||
// illegal behavior.
|
||||
// * if lhs type is unsigned, undef is returned regardless of rhs.
|
||||
// TODO: emit runtime safety for division by zero
|
||||
//
|
||||
// For floats:
|
||||
// If the rhs is zero, compile error for division by zero.
|
||||
// If the rhs is undefined, compile error because there is a possible
|
||||
// value (zero) for which the division would be illegal behavior.
|
||||
// If the lhs is undefined, result is undefined.
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (!lhs_val.isUndef()) {
|
||||
if (try lhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
|
||||
return sema.addConstant(resolved_type, Value.zero);
|
||||
}
|
||||
}
|
||||
}
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (rhs_val.isUndef()) {
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
}
|
||||
if (try rhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
|
||||
return sema.failWithDivideByZero(block, rhs_src);
|
||||
}
|
||||
}
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (lhs_val.isUndef()) {
|
||||
if (lhs_scalar_ty.isSignedInt() and rhs_scalar_ty.isSignedInt()) {
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (try sema.compare(block, src, rhs_val, .neq, Value.negative_one, resolved_type)) {
|
||||
return sema.addConstUndef(resolved_type);
|
||||
}
|
||||
}
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
}
|
||||
return sema.addConstUndef(resolved_type);
|
||||
}
|
||||
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (is_int) {
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.intDiv(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
} else {
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.floatDivTrunc(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
}
|
||||
} else break :rs rhs_src;
|
||||
} else break :rs lhs_src;
|
||||
};
|
||||
|
||||
try sema.requireRuntimeBlock(block, src, runtime_src);
|
||||
|
||||
if (block.wantSafety()) {
|
||||
try sema.addDivIntOverflowSafety(block, resolved_type, lhs_scalar_ty, maybe_lhs_val, maybe_rhs_val, casted_lhs, casted_rhs, is_int);
|
||||
try sema.addDivByZeroSafety(block, resolved_type, maybe_rhs_val, casted_rhs, is_int);
|
||||
}
|
||||
|
||||
return block.addBinOp(airTag(block, is_int, .div_trunc, .div_trunc_optimized), casted_lhs, casted_rhs);
|
||||
}
|
||||
|
||||
fn addDivIntOverflowSafety(
|
||||
sema: *Sema,
|
||||
block: *Block,
|
||||
resolved_type: Type,
|
||||
lhs_scalar_ty: Type,
|
||||
maybe_lhs_val: ?Value,
|
||||
maybe_rhs_val: ?Value,
|
||||
casted_lhs: Air.Inst.Ref,
|
||||
casted_rhs: Air.Inst.Ref,
|
||||
is_int: bool,
|
||||
) CompileError!void {
|
||||
if (!is_int) return;
|
||||
|
||||
// If the LHS is unsigned, it cannot cause overflow.
|
||||
if (!lhs_scalar_ty.isSignedInt()) return;
|
||||
|
||||
const mod = sema.mod;
|
||||
const target = mod.getTarget();
|
||||
|
||||
// If the LHS is widened to a larger integer type, no overflow is possible.
|
||||
if (lhs_scalar_ty.intInfo(target).bits < resolved_type.intInfo(target).bits) {
|
||||
return;
|
||||
}
|
||||
|
||||
const min_int = try resolved_type.minInt(sema.arena, target);
|
||||
const neg_one = try Value.Tag.int_i64.create(sema.arena, -1);
|
||||
|
||||
// If the LHS is comptime-known to be not equal to the min int,
|
||||
// no overflow is possible.
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (!lhs_val.compare(.eq, min_int, resolved_type, mod)) return;
|
||||
}
|
||||
|
||||
// If the RHS is comptime-known to not be equal to -1, no overflow is possible.
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (!rhs_val.compare(.eq, neg_one, resolved_type, mod)) return;
|
||||
}
|
||||
|
||||
var ok: Air.Inst.Ref = .none;
|
||||
if (resolved_type.zigTypeTag() == .Vector) {
|
||||
const vector_ty_ref = try sema.addType(resolved_type);
|
||||
if (maybe_lhs_val == null) {
|
||||
const min_int_ref = try sema.addConstant(
|
||||
resolved_type,
|
||||
try Value.Tag.repeated.create(sema.arena, min_int),
|
||||
);
|
||||
ok = try block.addCmpVector(casted_lhs, min_int_ref, .neq, vector_ty_ref);
|
||||
}
|
||||
if (maybe_rhs_val == null) {
|
||||
const neg_one_ref = try sema.addConstant(
|
||||
resolved_type,
|
||||
try Value.Tag.repeated.create(sema.arena, neg_one),
|
||||
);
|
||||
const rhs_ok = try block.addCmpVector(casted_rhs, neg_one_ref, .neq, vector_ty_ref);
|
||||
if (ok == .none) {
|
||||
ok = rhs_ok;
|
||||
} else {
|
||||
ok = try block.addBinOp(.bool_or, ok, rhs_ok);
|
||||
}
|
||||
}
|
||||
assert(ok != .none);
|
||||
ok = try block.addInst(.{
|
||||
.tag = .reduce,
|
||||
.data = .{ .reduce = .{
|
||||
.operand = ok,
|
||||
.operation = .And,
|
||||
} },
|
||||
});
|
||||
} else {
|
||||
if (maybe_lhs_val == null) {
|
||||
const min_int_ref = try sema.addConstant(resolved_type, min_int);
|
||||
ok = try block.addBinOp(.cmp_neq, casted_lhs, min_int_ref);
|
||||
}
|
||||
if (maybe_rhs_val == null) {
|
||||
const neg_one_ref = try sema.addConstant(resolved_type, neg_one);
|
||||
const rhs_ok = try block.addBinOp(.cmp_neq, casted_rhs, neg_one_ref);
|
||||
if (ok == .none) {
|
||||
ok = rhs_ok;
|
||||
} else {
|
||||
ok = try block.addBinOp(.bool_or, ok, rhs_ok);
|
||||
}
|
||||
}
|
||||
assert(ok != .none);
|
||||
}
|
||||
try sema.addSafetyCheck(block, ok, .integer_overflow);
|
||||
}
|
||||
|
||||
fn addDivByZeroSafety(
|
||||
sema: *Sema,
|
||||
block: *Block,
|
||||
resolved_type: Type,
|
||||
maybe_rhs_val: ?Value,
|
||||
casted_rhs: Air.Inst.Ref,
|
||||
is_int: bool,
|
||||
) CompileError!void {
|
||||
// Strict IEEE floats have well-defined division by zero.
|
||||
if (!is_int and block.float_mode == .Strict) return;
|
||||
|
||||
// If rhs was comptime-known to be zero a compile error would have been
|
||||
// emitted above.
|
||||
if (maybe_rhs_val != null) return;
|
||||
|
||||
const ok = if (resolved_type.zigTypeTag() == .Vector) ok: {
|
||||
const zero_val = try Value.Tag.repeated.create(sema.arena, Value.zero);
|
||||
const zero = try sema.addConstant(resolved_type, zero_val);
|
||||
const ok = try block.addCmpVector(casted_rhs, zero, .neq, try sema.addType(resolved_type));
|
||||
break :ok try block.addInst(.{
|
||||
.tag = if (is_int) .reduce else .reduce_optimized,
|
||||
.data = .{ .reduce = .{
|
||||
.operand = ok,
|
||||
.operation = .And,
|
||||
} },
|
||||
});
|
||||
} else ok: {
|
||||
const zero = try sema.addConstant(resolved_type, Value.zero);
|
||||
break :ok try block.addBinOp(if (is_int) .cmp_neq else .cmp_neq_optimized, casted_rhs, zero);
|
||||
};
|
||||
try sema.addSafetyCheck(block, ok, .divide_by_zero);
|
||||
}
|
||||
|
||||
fn airTag(block: *Block, is_int: bool, normal: Air.Inst.Tag, optimized: Air.Inst.Tag) Air.Inst.Tag {
|
||||
if (is_int) return normal;
|
||||
return switch (block.float_mode) {
|
||||
@ -11423,13 +11819,8 @@ fn analyzeArithmetic(
|
||||
const scalar_tag = resolved_type.scalarType().zigTypeTag();
|
||||
|
||||
const is_int = scalar_tag == .Int or scalar_tag == .ComptimeInt;
|
||||
const is_float = scalar_tag == .Float or scalar_tag == .ComptimeFloat;
|
||||
|
||||
if (!is_int and !(is_float and floatOpAllowed(zir_tag))) {
|
||||
return sema.fail(block, src, "invalid operands to binary expression: '{s}' and '{s}'", .{
|
||||
@tagName(lhs_zig_ty_tag), @tagName(rhs_zig_ty_tag),
|
||||
});
|
||||
}
|
||||
try sema.checkArithmeticOp(block, src, scalar_tag, lhs_zig_ty_tag, rhs_zig_ty_tag, zir_tag);
|
||||
|
||||
const mod = sema.mod;
|
||||
const target = mod.getTarget();
|
||||
@ -11636,187 +12027,6 @@ fn analyzeArithmetic(
|
||||
} else break :rs .{ .src = rhs_src, .air_tag = .sub_sat };
|
||||
} else break :rs .{ .src = lhs_src, .air_tag = .sub_sat };
|
||||
},
|
||||
.div_trunc => {
|
||||
// For integers:
|
||||
// If the lhs is zero, then zero is returned regardless of rhs.
|
||||
// If the rhs is zero, compile error for division by zero.
|
||||
// If the rhs is undefined, compile error because there is a possible
|
||||
// value (zero) for which the division would be illegal behavior.
|
||||
// If the lhs is undefined:
|
||||
// * if lhs type is signed:
|
||||
// * if rhs is comptime-known and not -1, result is undefined
|
||||
// * if rhs is -1 or runtime-known, compile error because there is a
|
||||
// possible value (-min_int / -1) for which division would be
|
||||
// illegal behavior.
|
||||
// * if lhs type is unsigned, undef is returned regardless of rhs.
|
||||
// TODO: emit runtime safety for division by zero
|
||||
//
|
||||
// For floats:
|
||||
// If the rhs is zero, compile error for division by zero.
|
||||
// If the rhs is undefined, compile error because there is a possible
|
||||
// value (zero) for which the division would be illegal behavior.
|
||||
// If the lhs is undefined, result is undefined.
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (!lhs_val.isUndef()) {
|
||||
if (try lhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
|
||||
return sema.addConstant(resolved_type, Value.zero);
|
||||
}
|
||||
}
|
||||
}
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (rhs_val.isUndef()) {
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
}
|
||||
if (try rhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
|
||||
return sema.failWithDivideByZero(block, rhs_src);
|
||||
}
|
||||
}
|
||||
const air_tag: Air.Inst.Tag = if (block.float_mode == .Optimized) .div_trunc_optimized else .div_trunc;
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (lhs_val.isUndef()) {
|
||||
if (lhs_scalar_ty.isSignedInt() and rhs_scalar_ty.isSignedInt()) {
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (try sema.compare(block, src, rhs_val, .neq, Value.negative_one, resolved_type)) {
|
||||
return sema.addConstUndef(resolved_type);
|
||||
}
|
||||
}
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
}
|
||||
return sema.addConstUndef(resolved_type);
|
||||
}
|
||||
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (is_int) {
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.intDiv(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
} else {
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.floatDivTrunc(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
}
|
||||
} else break :rs .{ .src = rhs_src, .air_tag = air_tag };
|
||||
} else break :rs .{ .src = lhs_src, .air_tag = air_tag };
|
||||
},
|
||||
.div_floor => {
|
||||
// For integers:
|
||||
// If the lhs is zero, then zero is returned regardless of rhs.
|
||||
// If the rhs is zero, compile error for division by zero.
|
||||
// If the rhs is undefined, compile error because there is a possible
|
||||
// value (zero) for which the division would be illegal behavior.
|
||||
// If the lhs is undefined:
|
||||
// * if lhs type is signed:
|
||||
// * if rhs is comptime-known and not -1, result is undefined
|
||||
// * if rhs is -1 or runtime-known, compile error because there is a
|
||||
// possible value (-min_int / -1) for which division would be
|
||||
// illegal behavior.
|
||||
// * if lhs type is unsigned, undef is returned regardless of rhs.
|
||||
// TODO: emit runtime safety for division by zero
|
||||
//
|
||||
// For floats:
|
||||
// If the rhs is zero, compile error for division by zero.
|
||||
// If the rhs is undefined, compile error because there is a possible
|
||||
// value (zero) for which the division would be illegal behavior.
|
||||
// If the lhs is undefined, result is undefined.
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (!lhs_val.isUndef()) {
|
||||
if (try lhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
|
||||
return sema.addConstant(resolved_type, Value.zero);
|
||||
}
|
||||
}
|
||||
}
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (rhs_val.isUndef()) {
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
}
|
||||
if (try rhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
|
||||
return sema.failWithDivideByZero(block, rhs_src);
|
||||
}
|
||||
}
|
||||
const air_tag: Air.Inst.Tag = if (block.float_mode == .Optimized) .div_floor_optimized else .div_floor;
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (lhs_val.isUndef()) {
|
||||
if (lhs_scalar_ty.isSignedInt() and rhs_scalar_ty.isSignedInt()) {
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (try sema.compare(block, src, rhs_val, .neq, Value.negative_one, resolved_type)) {
|
||||
return sema.addConstUndef(resolved_type);
|
||||
}
|
||||
}
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
}
|
||||
return sema.addConstUndef(resolved_type);
|
||||
}
|
||||
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (is_int) {
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.intDivFloor(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
} else {
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.floatDivFloor(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
}
|
||||
} else break :rs .{ .src = rhs_src, .air_tag = air_tag };
|
||||
} else break :rs .{ .src = lhs_src, .air_tag = air_tag };
|
||||
},
|
||||
.div_exact => {
|
||||
// For integers:
|
||||
// If the lhs is zero, then zero is returned regardless of rhs.
|
||||
// If the rhs is zero, compile error for division by zero.
|
||||
// If the rhs is undefined, compile error because there is a possible
|
||||
// value (zero) for which the division would be illegal behavior.
|
||||
// If the lhs is undefined, compile error because there is a possible
|
||||
// value for which the division would result in a remainder.
|
||||
// TODO: emit runtime safety for if there is a remainder
|
||||
// TODO: emit runtime safety for division by zero
|
||||
//
|
||||
// For floats:
|
||||
// If the rhs is zero, compile error for division by zero.
|
||||
// If the rhs is undefined, compile error because there is a possible
|
||||
// value (zero) for which the division would be illegal behavior.
|
||||
// If the lhs is undefined, compile error because there is a possible
|
||||
// value for which the division would result in a remainder.
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (lhs_val.isUndef()) {
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
} else {
|
||||
if (try lhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
|
||||
return sema.addConstant(resolved_type, Value.zero);
|
||||
}
|
||||
}
|
||||
}
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (rhs_val.isUndef()) {
|
||||
return sema.failWithUseOfUndef(block, rhs_src);
|
||||
}
|
||||
if (try rhs_val.compareWithZeroAdvanced(.eq, sema.kit(block, src))) {
|
||||
return sema.failWithDivideByZero(block, rhs_src);
|
||||
}
|
||||
}
|
||||
const air_tag: Air.Inst.Tag = if (block.float_mode == .Optimized) .div_exact_optimized else .div_exact;
|
||||
if (maybe_lhs_val) |lhs_val| {
|
||||
if (maybe_rhs_val) |rhs_val| {
|
||||
if (is_int) {
|
||||
// TODO: emit compile error if there is a remainder
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.intDiv(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
} else {
|
||||
// TODO: emit compile error if there is a remainder
|
||||
return sema.addConstant(
|
||||
resolved_type,
|
||||
try lhs_val.floatDiv(rhs_val, resolved_type, sema.arena, target),
|
||||
);
|
||||
}
|
||||
} else break :rs .{ .src = rhs_src, .air_tag = air_tag };
|
||||
} else break :rs .{ .src = lhs_src, .air_tag = air_tag };
|
||||
},
|
||||
.mul => {
|
||||
// For integers:
|
||||
// If either of the operands are zero, the result is zero.
|
||||
@ -12195,28 +12405,6 @@ fn analyzeArithmetic(
|
||||
}
|
||||
}
|
||||
switch (rs.air_tag) {
|
||||
// zig fmt: off
|
||||
.div_float, .div_exact, .div_trunc, .div_floor, .div_float_optimized,
|
||||
.div_exact_optimized, .div_trunc_optimized, .div_floor_optimized
|
||||
// zig fmt: on
|
||||
=> if (scalar_tag == .Int or block.float_mode == .Optimized) {
|
||||
const ok = if (resolved_type.zigTypeTag() == .Vector) ok: {
|
||||
const zero_val = try Value.Tag.repeated.create(sema.arena, Value.zero);
|
||||
const zero = try sema.addConstant(sema.typeOf(casted_rhs), zero_val);
|
||||
const ok = try block.addCmpVector(casted_rhs, zero, .neq, try sema.addType(resolved_type));
|
||||
break :ok try block.addInst(.{
|
||||
.tag = if (block.float_mode == .Optimized) .reduce_optimized else .reduce,
|
||||
.data = .{ .reduce = .{
|
||||
.operand = ok,
|
||||
.operation = .And,
|
||||
} },
|
||||
});
|
||||
} else ok: {
|
||||
const zero = try sema.addConstant(sema.typeOf(casted_rhs), Value.zero);
|
||||
break :ok try block.addBinOp(if (block.float_mode == .Optimized) .cmp_neq_optimized else .cmp_neq, casted_rhs, zero);
|
||||
};
|
||||
try sema.addSafetyCheck(block, ok, .divide_by_zero);
|
||||
},
|
||||
.rem, .mod, .rem_optimized, .mod_optimized => {
|
||||
const ok = if (resolved_type.zigTypeTag() == .Vector) ok: {
|
||||
const zero_val = try Value.Tag.repeated.create(sema.arena, Value.zero);
|
||||
@ -12243,47 +12431,6 @@ fn analyzeArithmetic(
|
||||
},
|
||||
else => {},
|
||||
}
|
||||
if (rs.air_tag == .div_exact or rs.air_tag == .div_exact_optimized) {
|
||||
const result = try block.addBinOp(.div_exact, casted_lhs, casted_rhs);
|
||||
const ok = if (scalar_tag == .Float) ok: {
|
||||
const floored = try block.addUnOp(.floor, result);
|
||||
|
||||
if (resolved_type.zigTypeTag() == .Vector) {
|
||||
const eql = try block.addCmpVector(result, floored, .eq, try sema.addType(resolved_type));
|
||||
break :ok try block.addInst(.{
|
||||
.tag = if (block.float_mode == .Optimized) .reduce_optimized else .reduce,
|
||||
.data = .{ .reduce = .{
|
||||
.operand = eql,
|
||||
.operation = .And,
|
||||
} },
|
||||
});
|
||||
} else {
|
||||
const is_in_range = try block.addBinOp(if (block.float_mode == .Optimized) .cmp_eq_optimized else .cmp_eq, result, floored);
|
||||
break :ok is_in_range;
|
||||
}
|
||||
} else ok: {
|
||||
const remainder = try block.addBinOp(.rem, casted_lhs, casted_rhs);
|
||||
|
||||
if (resolved_type.zigTypeTag() == .Vector) {
|
||||
const zero_val = try Value.Tag.repeated.create(sema.arena, Value.zero);
|
||||
const zero = try sema.addConstant(sema.typeOf(casted_rhs), zero_val);
|
||||
const eql = try block.addCmpVector(remainder, zero, .eq, try sema.addType(resolved_type));
|
||||
break :ok try block.addInst(.{
|
||||
.tag = .reduce,
|
||||
.data = .{ .reduce = .{
|
||||
.operand = eql,
|
||||
.operation = .And,
|
||||
} },
|
||||
});
|
||||
} else {
|
||||
const zero = try sema.addConstant(sema.typeOf(casted_rhs), Value.zero);
|
||||
const is_in_range = try block.addBinOp(if (block.float_mode == .Optimized) .cmp_eq_optimized else .cmp_eq, remainder, zero);
|
||||
break :ok is_in_range;
|
||||
}
|
||||
};
|
||||
try sema.addSafetyCheck(block, ok, .exact_division_remainder);
|
||||
return result;
|
||||
}
|
||||
}
|
||||
return block.addBinOp(rs.air_tag, casted_lhs, casted_rhs);
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user