From: Richard Henderson <rth@twiddle.net>
Date: Wed, 31 Jul 2013 04:26:04 +0000 (-1000)
Subject: tcg-ppc64: Avoid code for nop move
X-Git-Tag: v1.7.0-rc0~86^2~9
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=f8b84129073d600cef20d526814b9bdd15c2e1ba;p=qemu-xen-unstable.git

tcg-ppc64: Avoid code for nop move

While these are rare from code that's been through the optimizer,
it's not uncommon within the tcg backend.

Signed-off-by: Richard Henderson <rth@twiddle.net>
---

diff --git a/tcg/ppc64/tcg-target.c b/tcg/ppc64/tcg-target.c
index 27a955ba2a..357f8c11de 100644
--- a/tcg/ppc64/tcg-target.c
+++ b/tcg/ppc64/tcg-target.c
@@ -509,7 +509,9 @@ static const uint32_t tcg_to_isel[] = {
 static inline void tcg_out_mov(TCGContext *s, TCGType type,
                                TCGReg ret, TCGReg arg)
 {
-    tcg_out32(s, OR | SAB(arg, ret, arg));
+    if (ret != arg) {
+        tcg_out32(s, OR | SAB(arg, ret, arg));
+    }
 }
 
 static inline void tcg_out_rld(TCGContext *s, int op, TCGReg ra, TCGReg rs,