diff options
| author | balrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-07-19 10:46:13 +0000 |
|---|---|---|
| committer | balrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-07-19 10:46:13 +0000 |
| commit | a87aa10b85dcaf8e1a4cc962edbd562a96f78650 (patch) | |
| tree | 161ed997d554a01c6469258493fd7b1eb17d389b /target-arm/helper.c | |
| parent | 7997d92f2c75cf56e8142be8e4c1fb5b8dbcc2a4 (diff) | |
ARMv6: fix SIMD add/sub carry flags (Vincent Palatin).
After a quick code review, it seems to be a bad cut-n-paste between
16-bit and 8-bit UADD/USUB, indeed UADD8/USUB8 tries to set GE bits by
pair instead of one at a time.
Besides, the addition operations (UADD8/UADD16) set GE bits to "NOT
carry" instead of "carry" (probably once again due to a copy of the
substraction code which sets flags to "NOT borrow")
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4900 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'target-arm/helper.c')
| -rw-r--r-- | target-arm/helper.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c index 5998b989b2..021f077f94 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -2059,7 +2059,7 @@ static inline uint8_t sub8_usat(uint8_t a, uint8_t b) uint32_t sum; \ sum = (uint32_t)(uint16_t)(a) + (uint32_t)(uint16_t)(b); \ RESULT(sum, n, 16); \ - if ((sum >> 16) == 0) \ + if ((sum >> 16) == 1) \ ge |= 3 << (n * 2); \ } while(0) @@ -2067,8 +2067,8 @@ static inline uint8_t sub8_usat(uint8_t a, uint8_t b) uint32_t sum; \ sum = (uint32_t)(uint8_t)(a) + (uint32_t)(uint8_t)(b); \ RESULT(sum, n, 8); \ - if ((sum >> 8) == 0) \ - ge |= 3 << (n * 2); \ + if ((sum >> 8) == 1) \ + ge |= 1 << n; \ } while(0) #define SUB16(a, b, n) do { \ @@ -2084,7 +2084,7 @@ static inline uint8_t sub8_usat(uint8_t a, uint8_t b) sum = (uint32_t)(uint8_t)(a) - (uint32_t)(uint8_t)(b); \ RESULT(sum, n, 8); \ if ((sum >> 8) == 0) \ - ge |= 3 << (n * 2); \ + ge |= 1 << n; \ } while(0) #define PFX u |