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stage2 ARM: implement slice_elem_ptr, ptr_elem_ptr

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joachimschmidt557 2022-03-17 09:57:10 +01:00
parent f3f5a5d05b
commit 3ecba7d7a2
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GPG Key ID: E0B575BE2884ACC5
6 changed files with 60 additions and 33 deletions
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88
src/arch/arm/CodeGen.zig
View File

@ -1358,24 +1358,28 @@ fn airWrapErrUnionErr(self: *Self, inst: Air.Inst.Index) !void {
return self.finishAir(inst, result, .{ ty_op.operand, .none, .none });
}
fn slicePtr(self: *Self, mcv: MCValue) !MCValue {
switch (mcv) {
.dead, .unreach => unreachable,
.register => unreachable, // a slice doesn't fit in one register
.stack_argument_offset => |off| {
return MCValue{ .stack_argument_offset = off + 4 };
},
.stack_offset => |off| {
return MCValue{ .stack_offset = off + 4 };
},
.memory => |addr| {
return MCValue{ .memory = addr };
},
else => return self.fail("TODO implement slice_ptr for {}", .{mcv}),
}
}
fn airSlicePtr(self: *Self, inst: Air.Inst.Index) !void {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else result: {
const mcv = try self.resolveInst(ty_op.operand);
switch (mcv) {
.dead, .unreach => unreachable,
.register => unreachable, // a slice doesn't fit in one register
.stack_argument_offset => |off| {
break :result MCValue{ .stack_argument_offset = off + 4 };
},
.stack_offset => |off| {
break :result MCValue{ .stack_offset = off + 4 };
},
.memory => |addr| {
break :result MCValue{ .memory = addr };
},
else => return self.fail("TODO implement slice_ptr for {}", .{mcv}),
}
break :result try self.slicePtr(mcv);
};
return self.finishAir(inst, result, .{ ty_op.operand, .none, .none });
}
@ -1409,7 +1413,7 @@ fn airPtrSliceLenPtr(self: *Self, inst: Air.Inst.Index) !void {
switch (mcv) {
.dead, .unreach => unreachable,
.ptr_stack_offset => |off| {
break :result MCValue{ .ptr_stack_offset = off + 4 };
break :result MCValue{ .ptr_stack_offset = off };
},
else => return self.fail("TODO implement ptr_slice_len_ptr for {}", .{mcv}),
}
@ -1424,7 +1428,7 @@ fn airPtrSlicePtrPtr(self: *Self, inst: Air.Inst.Index) !void {
switch (mcv) {
.dead, .unreach => unreachable,
.ptr_stack_offset => |off| {
break :result MCValue{ .ptr_stack_offset = off };
break :result MCValue{ .ptr_stack_offset = off + 4 };
},
else => return self.fail("TODO implement ptr_slice_ptr_ptr for {}", .{mcv}),
}
@ -1455,15 +1459,17 @@ fn airSliceElemVal(self: *Self, inst: Air.Inst.Index) !void {
if (index_is_register) self.register_manager.freezeRegs(&.{index_mcv.register});
defer if (index_is_register) self.register_manager.unfreezeRegs(&.{index_mcv.register});
const base_mcv: MCValue = switch (slice_mcv) {
.stack_offset => |off| .{ .register = try self.copyToTmpRegister(slice_ptr_field_type, .{ .stack_offset = off + 4 }) },
.stack_argument_offset => |off| .{ .register = try self.copyToTmpRegister(slice_ptr_field_type, .{ .stack_argument_offset = off + 4 }) },
else => return self.fail("TODO slice_elem_val when slice is {}", .{slice_mcv}),
};
self.register_manager.freezeRegs(&.{base_mcv.register});
const base_mcv = try self.slicePtr(slice_mcv);
switch (elem_size) {
1, 4 => {
const base_reg = switch (base_mcv) {
.register => |r| r,
else => try self.copyToTmpRegister(slice_ptr_field_type, base_mcv),
};
self.register_manager.freezeRegs(&.{base_reg});
defer self.register_manager.unfreezeRegs(&.{base_reg});
const dst_reg = try self.register_manager.allocReg(inst);
const dst_mcv = MCValue{ .register = dst_reg };
self.register_manager.freezeRegs(&.{dst_reg});
@ -1491,13 +1497,11 @@ fn airSliceElemVal(self: *Self, inst: Air.Inst.Index) !void {
.tag = tag,
.data = .{ .rr_offset = .{
.rt = dst_reg,
.rn = base_mcv.register,
.rn = base_reg,
.offset = .{ .offset = Instruction.Offset.reg(index_reg, .{ .lsl = shift }) },
} },
});
self.register_manager.unfreezeRegs(&.{base_mcv.register});
break :result dst_mcv;
},
else => {
@ -1515,7 +1519,16 @@ fn airSliceElemVal(self: *Self, inst: Air.Inst.Index) !void {
fn airSliceElemPtr(self: *Self, inst: Air.Inst.Index) !void {
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const extra = self.air.extraData(Air.Bin, ty_pl.payload).data;
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else return self.fail("TODO implement slice_elem_ptr for {}", .{self.target.cpu.arch});
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else result: {
const slice_mcv = try self.resolveInst(extra.lhs);
const index_mcv = try self.resolveInst(extra.rhs);
const base_mcv = try self.slicePtr(slice_mcv);
const slice_ty = self.air.typeOf(extra.lhs);
const addr = try self.binOp(.ptr_add, null, base_mcv, index_mcv, slice_ty, Type.usize);
break :result addr;
};
return self.finishAir(inst, result, .{ extra.lhs, extra.rhs, .none });
}
@ -1535,7 +1548,15 @@ fn airPtrElemVal(self: *Self, inst: Air.Inst.Index) !void {
fn airPtrElemPtr(self: *Self, inst: Air.Inst.Index) !void {
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const extra = self.air.extraData(Air.Bin, ty_pl.payload).data;
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else return self.fail("TODO implement ptr_elem_ptr for {}", .{self.target.cpu.arch});
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else result: {
const ptr_mcv = try self.resolveInst(extra.lhs);
const index_mcv = try self.resolveInst(extra.rhs);
const ptr_ty = self.air.typeOf(extra.lhs);
const addr = try self.binOp(.ptr_add, null, ptr_mcv, index_mcv, ptr_ty, Type.usize);
break :result addr;
};
return self.finishAir(inst, result, .{ extra.lhs, extra.rhs, .none });
}
@ -1760,7 +1781,7 @@ fn store(self: *Self, ptr: MCValue, value: MCValue, ptr_ty: Type, value_ty: Type
try self.genStrRegister(value_reg, addr_reg, value_ty);
},
else => {
if (value_ty.abiSize(self.target.*) <= 4) {
if (elem_size <= 4) {
const tmp_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{tmp_reg});
defer self.register_manager.unfreezeRegs(&.{tmp_reg});
@ -1784,6 +1805,17 @@ fn store(self: *Self, ptr: MCValue, value: MCValue, ptr_ty: Type, value_ty: Type
try self.genSetReg(ptr_ty, src_reg, .{ .ptr_stack_offset = off });
},
.memory => |addr| try self.genSetReg(Type.usize, src_reg, .{ .immediate = @intCast(u32, addr) }),
.stack_argument_offset => |unadjusted_off| {
const adj_off = unadjusted_off + elem_size;
_ = try self.addInst(.{
.tag = .ldr_ptr_stack_argument,
.data = .{ .r_stack_offset = .{
.rt = src_reg,
.stack_offset = adj_off,
} },
});
},
else => return self.fail("TODO store {} to register", .{value}),
}

1
test/behavior/align.zig
View File

@ -115,7 +115,6 @@ fn addUnalignedSlice(a: []align(1) const u32, b: []align(1) const u32) u32 {
test "specifying alignment allows pointer cast" {
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
try testBytesAlign(0x33);
}

1
test/behavior/array.zig
View File

@ -272,7 +272,6 @@ test "read/write through global variable array of struct fields initialized via
test "implicit cast single-item pointer" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
try testImplicitCastSingleItemPtr();
comptime try testImplicitCastSingleItemPtr();

1
test/behavior/basic.zig
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@ -636,7 +636,6 @@ var global_ptr = &gdt[0];
test "global constant is loaded with a runtime-known index" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
const S = struct {
fn doTheTest() !void {

1
test/behavior/optional.zig
View File

@ -275,7 +275,6 @@ test "0-bit child type coerced to optional" {
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
const S = struct {
fn doTheTest() !void {

1
test/behavior/struct.zig
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@ -1289,7 +1289,6 @@ test "initialize struct with empty literal" {
test "loading a struct pointer perfoms a copy" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
const S = struct {
a: i32,