From e3160ec573882108e2b51cefcf3abc5b346f70c0 Mon Sep 17 00:00:00 2001
From: Jakub Konka <kubkon@jakubkonka.com>
Date: Thu, 5 May 2022 21:35:59 +0200
Subject: [PATCH] x64: mul_with_overflow: cannot reuse operand if not the
 result

---
 src/arch/x86_64/CodeGen.zig | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/arch/x86_64/CodeGen.zig b/src/arch/x86_64/CodeGen.zig
index 6a6e6ad6cb..767a67bf92 100644
--- a/src/arch/x86_64/CodeGen.zig
+++ b/src/arch/x86_64/CodeGen.zig
@@ -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});