From: Peter Maydell <peter.maydell@linaro.org>
Date: Tue, 15 Feb 2011 13:44:45 +0000 (+0000)
Subject: target-arm: Fix saturated values for Neon right shifts
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=960e623bfd45c92ce165177b8a0e748867fe5878;p=qemu.git

target-arm: Fix saturated values for Neon right shifts

Fix value returned by signed 8 and 16 bit qrshl helpers
when the result has saturated.

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 c97aa7dbd4..235a32c670 100644
--- a/target-arm/neon_helper.c
+++ b/target-arm/neon_helper.c
@@ -886,7 +886,10 @@ uint64_t HELPER(neon_qrshl_u64)(CPUState *env, uint64_t val, uint64_t shiftop)
         dest = src1 << tmp; \
         if ((dest >> tmp) != src1) { \
             SET_QC(); \
-            dest = src1 >> 31; \
+            dest = (uint32_t)(1 << (sizeof(src1) * 8 - 1)); \
+            if (src1 > 0) { \
+                dest--; \
+            } \
         } \
     }} while (0)
 NEON_VOP_ENV(qrshl_s8, neon_s8, 4)