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target-arm: Fix signed VQRSHL by large shift counts 

Handle the case of signed VQRSHL by a shift count of the width of the
data type or larger, which must be special cased in the qrshl_s*
helper functions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-02-15 13:44:48 +00:00 committed by Aurelien Jarno
parent 0b36f4cd47
commit 7b6ecf5b3a
1 changed files with 31 additions and 3 deletions
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34
target-arm/neon_helper.c
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@ -880,7 +880,19 @@ uint64_t HELPER(neon_qrshl_u64)(CPUState *env, uint64_t val, uint64_t shiftop)
#define NEON_FN(dest, src1, src2) do { \
int8_t tmp; \
tmp = (int8_t)src2; \
if (tmp < 0) { \
if (tmp >= (ssize_t)sizeof(src1) * 8) { \
if (src1) { \
SET_QC(); \
dest = (1 << (sizeof(src1) * 8 - 1)); \
if (src1 > 0) { \
dest--; \
} \
} else { \
dest = 0; \
} \
} else if (tmp <= -(ssize_t)sizeof(src1) * 8) { \
dest = 0; \
} else if (tmp < 0) { \
dest = (src1 + (1 << (-1 - tmp))) >> -tmp; \
} else { \
dest = src1 << tmp; \
@ -903,7 +915,16 @@ uint32_t HELPER(neon_qrshl_s32)(CPUState *env, uint32_t valop, uint32_t shiftop)
int32_t dest;
int32_t val = (int32_t)valop;
int8_t shift = (int8_t)shiftop;
if (shift < 0) {
if (shift >= 32) {
if (val) {
SET_QC();
dest = (val >> 31) ^ ~SIGNBIT;
} else {
dest = 0;
}
} else if (shift <= -32) {
dest = 0;
} else if (shift < 0) {
int64_t big_dest = ((int64_t)val + (1 << (-1 - shift)));
dest = big_dest >> -shift;
} else {
@ -923,7 +944,14 @@ uint64_t HELPER(neon_qrshl_s64)(CPUState *env, uint64_t valop, uint64_t shiftop)
int8_t shift = (uint8_t)shiftop;
int64_t val = valop;
if (shift < 0) {
if (shift >= 64) {
if (val) {
SET_QC();
val = (val >> 63) ^ ~SIGNBIT64;
}
} else if (shift <= -64) {
val = 0;
} else if (shift < 0) {
val >>= (-shift - 1);
if (val == INT64_MAX) {
/* In this case, it means that the rounding constant is 1,