From: Peter Maydell <peter.maydell@linaro.org>
Date: Tue, 7 Dec 2010 14:13:43 +0000 (+0000)
Subject: target-arm: Fix VQSHL of signed 64 bit values by shift counts >= 64
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=eb7a3d7964f748ba815200372d7ff403737c54d7;p=qemu-xen-4.1-testing.git

target-arm: Fix VQSHL of signed 64 bit values by shift counts >= 64

VQSHL of a signed 64 bit non-zero value by a shift count >= 64 should
saturate; return the correct value in this case.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---

diff --git a/target-arm/neon_helper.c b/target-arm/neon_helper.c
index d29b88461..2dc3d96db 100644
--- a/target-arm/neon_helper.c
+++ b/target-arm/neon_helper.c
@@ -608,7 +608,7 @@ uint64_t HELPER(neon_qshl_s64)(CPUState *env, uint64_t valop, uint64_t shiftop)
     if (shift >= 64) {
         if (val) {
             SET_QC();
-            val = (val >> 63) & ~SIGNBIT64;
+            val = (val >> 63) ^ ~SIGNBIT64;
         }
     } else if (shift <= -64) {
         val >>= 63;