From 88ad920b8adbce8b00085c51a61e57b5fbc83b0c Mon Sep 17 00:00:00 2001
From: j_mayer <j_mayer@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Thu, 25 Oct 2007 23:36:08 +0000
Subject: Fix PowerPC 64x64 bits multiplication overflow check.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3444 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-ppc/op_helper.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index 13c1fbb00f..06a5a561ca 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -331,7 +331,8 @@ void do_mulldo (void)
     uint64_t tl;
 
     muls64(&tl, &th, T0, T1);
-    if (likely(th == 0)) {
+    /* If th != 0 && th != -1, then we had an overflow */
+    if (likely((th + 1) <= 1)) {
         xer_ov = 0;
     } else {
         xer_ov = 1;
-- 
cgit v1.2.3