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[Qemu-devel] [PATCH 02/10] target-arm: Fix signed VRSHL by large shift c
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH 02/10] target-arm: Fix signed VRSHL by large shift counts |
Date: |
Tue, 15 Feb 2011 13:44:42 +0000 |
Correctly handle VRSHL of signed values by a shift count of the
width of the data type or larger, which must be special-cased in the
rshl_s* helper functions.
Signed-off-by: Peter Maydell <address@hidden>
---
target-arm/neon_helper.c | 17 +++--------------
1 files changed, 3 insertions(+), 14 deletions(-)
diff --git a/target-arm/neon_helper.c b/target-arm/neon_helper.c
index cc63636..f692640 100644
--- a/target-arm/neon_helper.c
+++ b/target-arm/neon_helper.c
@@ -543,14 +543,9 @@ uint64_t HELPER(neon_shl_s64)(uint64_t valop, uint64_t
shiftop)
#define NEON_FN(dest, src1, src2) do { \
int8_t tmp; \
tmp = (int8_t)src2; \
- if (tmp >= (ssize_t)sizeof(src1) * 8) { \
+ if ((tmp >= (ssize_t)sizeof(src1) * 8) \
+ || (tmp <= -(ssize_t)sizeof(src1) * 8)) { \
dest = 0; \
- } else if (tmp < -(ssize_t)sizeof(src1) * 8) { \
- dest = src1 >> (sizeof(src1) * 8 - 1); \
- } else if (tmp == -(ssize_t)sizeof(src1) * 8) { \
- dest = src1 >> (tmp - 1); \
- dest++; \
- dest >>= 1; \
} else if (tmp < 0) { \
dest = (src1 + (1 << (-1 - tmp))) >> -tmp; \
} else { \
@@ -584,14 +579,8 @@ uint64_t HELPER(neon_rshl_s64)(uint64_t valop, uint64_t
shiftop)
{
int8_t shift = (int8_t)shiftop;
int64_t val = valop;
- if (shift >= 64) {
+ if ((shift >= 64) || (shift <= -64)) {
val = 0;
- } else if (shift < -64) {
- val >>= 63;
- } else if (shift == -63) {
- val >>= 63;
- val++;
- val >>= 1;
} else if (shift < 0) {
val >>= (-shift - 1);
if (val == INT64_MAX) {
--
1.7.1
- [Qemu-devel] [PATCH 00/10] Fix Neon shift instructions, Peter Maydell, 2011/02/15
- [Qemu-devel] [PATCH 03/10] target-arm: Fix unsigned VRSHL.s8 and .s16 right shifts by type width, Peter Maydell, 2011/02/15
- [Qemu-devel] [PATCH 10/10] target-arm: Fix shift by immediate and narrow where src, dest overlap, Peter Maydell, 2011/02/15
- [Qemu-devel] [PATCH 08/10] target-arm: Fix signed VQRSHL by large shift counts, Peter Maydell, 2011/02/15
- [Qemu-devel] [PATCH 04/10] target-arm: fix unsigned 64 bit right shifts., Peter Maydell, 2011/02/15
- [Qemu-devel] [PATCH 07/10] target-arm: fix decoding of Neon 64 bit shifts., Peter Maydell, 2011/02/15
- [Qemu-devel] [PATCH 05/10] target-arm: Fix saturated values for Neon right shifts, Peter Maydell, 2011/02/15
- [Qemu-devel] [PATCH 02/10] target-arm: Fix signed VRSHL by large shift counts,
Peter Maydell <=
- [Qemu-devel] [PATCH 01/10] target-arm: Fix rounding constant addition for Neon shifts, Peter Maydell, 2011/02/15
- [Qemu-devel] [PATCH 06/10] target-arm: fix Neon VQSHRN and VSHRN., Peter Maydell, 2011/02/15
- [Qemu-devel] [PATCH 09/10] target-arm: Fix unsigned VQRSHL by large shift counts, Peter Maydell, 2011/02/15
- [Qemu-devel] Re: [PATCH 00/10] Fix Neon shift instructions, Christophe Lyon, 2011/02/15
- Re: [Qemu-devel] [PATCH 00/10] Fix Neon shift instructions, Aurelien Jarno, 2011/02/20