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target-arm: Fix signed VRSHL by large shift counts

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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 <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-02-15 13:44:42 +00:00 committed by Aurelien Jarno
parent 4bd4ee072c
commit 0670a7b65b
1 changed files with 3 additions and 14 deletions
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17
target-arm/neon_helper.c
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@ -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) {