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wasm: support all @div{trunc/floor/exact} ops

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This does however not support floats of bitsizes
different than 32 or 64. f16, f80, f126 will require
support for compiler-rt and are out-of-scope for this commit.

Signed integers are currently not supported either.
This commit is contained in:
Luuk de Gram 2022-06-08 20:00:04 +02:00
parent 180baa0546
commit 9b84f29503
1 changed files with 32 additions and 4 deletions
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36
src/arch/wasm/CodeGen.zig
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@ -1441,7 +1441,11 @@ fn genInst(self: *Self, inst: Air.Inst.Index) !WValue {
.subwrap => self.airWrapBinOp(inst, .sub),
.mul => self.airBinOp(inst, .mul),
.mulwrap => self.airWrapBinOp(inst, .mul),
.div_trunc => self.airBinOp(inst, .div),
.div_float,
.div_exact,
.div_trunc,
=> self.airBinOp(inst, .div),
.div_floor => self.airDivFloor(inst),
.bit_and => self.airBinOp(inst, .@"and"),
.bit_or => self.airBinOp(inst, .@"or"),
.bool_and => self.airBinOp(inst, .@"and"),
@ -1583,9 +1587,6 @@ fn genInst(self: *Self, inst: Air.Inst.Index) !WValue {
.add_sat,
.sub_sat,
.mul_sat,
.div_float,
.div_floor,
.div_exact,
.mod,
.assembly,
.shl_sat,
@ -4757,3 +4758,30 @@ fn airByteSwap(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
else => return self.fail("TODO: @byteSwap for integers with bitsize {d}", .{int_info.bits}),
}
}
fn airDivFloor(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
if (self.liveness.isUnused(inst)) return WValue{ .none = {} };
const bin_op = self.air.instructions.items(.data)[inst].bin_op;
const ty = self.air.typeOfIndex(inst);
const lhs = try self.resolveInst(bin_op.lhs);
const rhs = try self.resolveInst(bin_op.rhs);
const div_result = try self.binOp(lhs, rhs, ty, .div);
if (ty.isUnsignedInt()) {
return div_result;
} else if (ty.isSignedInt()) {
return self.fail("TODO: `@divFloor` for signed integers", .{});
}
try self.emitWValue(div_result);
switch (ty.floatBits(self.target)) {
32 => try self.addTag(.f32_floor),
64 => try self.addTag(.f64_floor),
else => |bit_size| return self.fail("TODO: `@divFloor` for floats with bitsize: {d}", .{bit_size}),
}
const result = try self.allocLocal(ty);
try self.addLabel(.local_set, result.local);
return result;
}