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target-arm: Fix unsigned VQRSHL by large shift counts 

Correctly handle VQRSHL of unsigned values by a shift count of the
width of the data type or larger, which must be special-cased in the
qrshl_u* 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 13:44:49 +00:00 committed by Aurelien Jarno
parent 7b6ecf5b3a
commit 33ebc29337
1 changed files with 34 additions and 3 deletions
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37
target-arm/neon_helper.c
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@ -818,7 +818,18 @@ uint64_t HELPER(neon_qshlu_s64)(CPUState *env, uint64_t valop, 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 = ~0; \
} else { \
dest = 0; \
} \
} else if (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 < 0) { \
dest = (src1 + (1 << (-1 - tmp))) >> -tmp; \
} else { \
dest = src1 << tmp; \
@ -837,7 +848,18 @@ uint32_t HELPER(neon_qrshl_u32)(CPUState *env, uint32_t val, uint32_t shiftop)
{
uint32_t dest;
int8_t shift = (int8_t)shiftop;
if (shift < 0) {
if (shift >= 32) {
if (val) {
SET_QC();
dest = ~0;
} else {
dest = 0;
}
} else if (shift < -32) {
dest = 0;
} else if (shift == -32) {
dest = val >> 31;
} else if (shift < 0) {
uint64_t big_dest = ((uint64_t)val + (1 << (-1 - shift)));
dest = big_dest >> -shift;
} else {
@ -855,7 +877,16 @@ uint32_t HELPER(neon_qrshl_u32)(CPUState *env, uint32_t val, uint32_t shiftop)
uint64_t HELPER(neon_qrshl_u64)(CPUState *env, uint64_t val, uint64_t shiftop)
{
int8_t shift = (int8_t)shiftop;
if (shift < 0) {
if (shift >= 64) {
if (val) {
SET_QC();
val = ~0;
}
} else if (shift < -64) {
val = 0;
} else if (shift == -64) {
val >>= 63;
} else if (shift < 0) {
val >>= (-shift - 1);
if (val == UINT64_MAX) {
/* In this case, it means that the rounding constant is 1,