qemu/0020-tcg-optimize-simplify-and-r-a-0-cases.patch
Cole Robinson 9290838132 Fix boot hang if console is not connected (bz #894451)
Fix segfault with zero length virtio-scsi disk (bz #847549)
2013-02-02 15:47:37 -05:00

27 lines
941 B
Diff

From f08c59ce7dee67a95cf06d9588b4312e7d071788 Mon Sep 17 00:00:00 2001
From: Aurelien Jarno <aurelien@aurel32.net>
Date: Thu, 6 Sep 2012 16:47:14 +0200
Subject: [PATCH] tcg/optimize: simplify and r, a, 0 cases
and r, a, 0 is equivalent to a movi r, 0.
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
tcg/optimize.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 0db849e..c12cb2b 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -360,6 +360,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
/* Simplify expression for "op r, a, 0 => movi r, 0" cases */
switch (op) {
+ CASE_OP_32_64(and):
CASE_OP_32_64(mul):
if ((temps[args[2]].state == TCG_TEMP_CONST
&& temps[args[2]].val == 0)) {