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x86_64: handle struct_field_ptr for stack_offset mcv

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This commit is contained in:
Jakub Konka 2022-02-01 21:45:39 +01:00
parent 9de30bb065
commit 0cccd8a887
1 changed files with 16 additions and 4 deletions
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20
src/arch/x86_64/CodeGen.zig
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@ -1795,7 +1795,8 @@ fn structFieldPtr(self: *Self, inst: Air.Inst.Index, operand: Air.Inst.Ref, inde
return MCValue.dead;
}
const mcv = try self.resolveInst(operand);
const struct_ty = self.air.typeOf(operand).childType();
const ptr_ty = self.air.typeOf(operand);
const struct_ty = ptr_ty.childType();
const struct_size = @intCast(u32, struct_ty.abiSize(self.target.*));
const struct_field_offset = @intCast(u32, struct_ty.structFieldOffset(index, self.target.*));
const struct_field_ty = struct_ty.structFieldType(index);
@ -1804,12 +1805,23 @@ fn structFieldPtr(self: *Self, inst: Air.Inst.Index, operand: Air.Inst.Ref, inde
const dst_mcv: MCValue = result: {
switch (mcv) {
.stack_offset => {
const offset_reg = try self.copyToTmpRegister(ptr_ty, .{
.immediate = offset_to_field,
});
self.register_manager.freezeRegs(&.{offset_reg});
defer self.register_manager.unfreezeRegs(&.{offset_reg});
const dst_mcv = try self.copyToNewRegister(inst, ptr_ty, mcv);
try self.genBinMathOpMir(.add, ptr_ty, dst_mcv, .{ .register = offset_reg });
break :result dst_mcv;
},
.ptr_stack_offset => |off| {
const ptr_stack_offset = off + @intCast(i32, offset_to_field);
break :result MCValue{ .ptr_stack_offset = ptr_stack_offset };
},
.register => |reg| {
const offset_reg = try self.copyToTmpRegister(Type.usize, .{
const offset_reg = try self.copyToTmpRegister(ptr_ty, .{
.immediate = offset_to_field,
});
self.register_manager.freezeRegs(&.{offset_reg});
@ -1822,13 +1834,13 @@ fn structFieldPtr(self: *Self, inst: Air.Inst.Index, operand: Air.Inst.Ref, inde
} else {
self.register_manager.freezeRegs(&.{reg});
const result_reg = try self.register_manager.allocReg(inst, &.{});
try self.genSetReg(Type.usize, result_reg, mcv);
try self.genSetReg(ptr_ty, result_reg, mcv);
break :blk result_reg;
}
};
defer if (!can_reuse_operand) self.register_manager.unfreezeRegs(&.{reg});
try self.genBinMathOpMir(.add, Type.usize, .{ .register = result_reg }, .{ .register = offset_reg });
try self.genBinMathOpMir(.add, ptr_ty, .{ .register = result_reg }, .{ .register = offset_reg });
break :result MCValue{ .register = result_reg };
},
else => return self.fail("TODO implement codegen struct_field_ptr for {}", .{mcv}),