From f7167c9ec81a0e8cd99f6692fa60ae1d476c9758 Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Sat, 20 Dec 2025 07:54:46 +0100
Subject: x86-64: peephole optimization for 3-address shift -> lea

---
 x86_64/isel.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'x86_64/isel.c')

diff --git a/x86_64/isel.c b/x86_64/isel.c
index 19692ed..2b087cd 100644
--- a/x86_64/isel.c
+++ b/x86_64/isel.c
@@ -507,6 +507,7 @@ sel(struct function *fn, struct instr *ins, struct block *blk, int *curi)
    ALU:
       if (!(op == Oadd && kisint(ins->cls))) /* 3-address add is lea */
       if (!(op == Omul && kisint(ins->cls) && isimm32(ins->r))) /* for (I)MUL r,r/m,imm */
+      if (!(op == Oshl && ins->r.t == RICON && ins->r.i <= 3)) /* can be lea */
          ins->inplace = 1;
       if (iscon(ins->l)) {
          fixarg(&ins->l, ins, blk, curi);
-- 
cgit v1.2.3