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x64: mul_with_overflow: cannot reuse operand if not the result

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This commit is contained in:
Jakub Konka 2022-05-05 21:35:59 +02:00
parent 0728847ce7
commit e3160ec573
1 changed files with 1 additions and 4 deletions
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5
src/arch/x86_64/CodeGen.zig
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@ -1496,11 +1496,8 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
rhs.freezeIfRegister(&self.register_manager);
defer rhs.unfreezeIfRegister(&self.register_manager);
// TODO check if we could reuse rhs instead, and swap the values out.
const dst_reg: Register = blk: {
if (self.reuseOperand(inst, bin_op.lhs, 0, lhs)) {
if (lhs.isRegister()) break :blk lhs.register;
}
if (lhs.isRegister()) break :blk lhs.register;
break :blk try self.copyToTmpRegister(ty, lhs);
};
self.register_manager.freezeRegs(&.{dst_reg});