From bed033d3ac67a9c5d88e061c6070d049bd7527fd Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Thu, 11 Sep 2025 10:56:10 +0200
Subject: amd64: improve codegen for ADD

---
 amd64/emit.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'amd64')

diff --git a/amd64/emit.c b/amd64/emit.c
index c10e751..6634c64 100644
--- a/amd64/emit.c
+++ b/amd64/emit.c
@@ -837,6 +837,9 @@ emitinstr(uchar **pcode, struct function *fn, struct block *blk, int curi, struc
          Xaddf(pcode, cls, dst, mkimmdatregoper(ins->r));
       } else if (ins->reg-1 == dst.reg) { /* two-address add */
          Xadd(pcode, cls, dst, mkimmdatregoper(ins->r));
+      } else if (isregref(ins->r) && ins->reg-1 == mkregoper(ins->r).reg) {
+         /* also two-address after swapping operands */
+         Xadd(pcode, cls, reg2oper(ins->reg-1), mkimmdatregoper(ins->l));
       } else { /* three-address add (lea) */
          struct oper mem = { OMEM, .base = NOBASE, .index = NOINDEX };
          dst = reg2oper(ins->reg-1);
-- 
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