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target-arm: Fix GE bits for v6media signed modulo arithmetic

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Fix the signed modulo arithmetic helpers for the v6media
instructions (SADD8, SSUB8, SADD16, SSUB16, SASX, SSAX) to set
the GE bits correctly (based on the result of the add or subtract
before it is truncated to 16 bits, not after).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-03-10 18:51:49 +00:00 committed by Aurelien Jarno
parent 2a0308c54f
commit db6e2e65ad
1 changed files with 2 additions and 2 deletions
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4
target-arm/helper.c
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@ -2171,7 +2171,7 @@ static inline uint8_t sub8_usat(uint8_t a, uint8_t b)
/* Signed modulo arithmetic. */ /* Signed modulo arithmetic. */
#define SARITH16(a, b, n, op) do { \ #define SARITH16(a, b, n, op) do { \
int32_t sum; \ int32_t sum; \
sum = (int16_t)((uint16_t)(a) op (uint16_t)(b)); \ sum = (int32_t)(int16_t)(a) op (int32_t)(int16_t)(b); \
RESULT(sum, n, 16); \ RESULT(sum, n, 16); \
if (sum >= 0) \ if (sum >= 0) \
ge |= 3 << (n * 2); \ ge |= 3 << (n * 2); \
@ -2179,7 +2179,7 @@ static inline uint8_t sub8_usat(uint8_t a, uint8_t b)
#define SARITH8(a, b, n, op) do { \ #define SARITH8(a, b, n, op) do { \
int32_t sum; \ int32_t sum; \
sum = (int8_t)((uint8_t)(a) op (uint8_t)(b)); \ sum = (int32_t)(int8_t)(a) op (int32_t)(int8_t)(b); \
RESULT(sum, n, 8); \ RESULT(sum, n, 8); \
if (sum >= 0) \ if (sum >= 0) \
ge |= 1 << n; \ ge |= 1 << n; \