diff options
| author | Christophe Lyon <christophe.lyon@st.com> | 2011-02-04 15:17:51 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2011-02-04 20:57:41 +0100 |
| commit | 72902672dc2ed6281cdb205259c1d52ecf01f6b2 (patch) | |
| tree | fca59bfa29ce8ab11ca444ae651c4e5d513546a5 /target-arm/neon_helper.c | |
| parent | 5371cb81405a35ca4c1f6ab23f93a4f7260ffa53 (diff) | |
Set the right overflow bit for neon 32 and 64 bit saturating add/sub.
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'target-arm/neon_helper.c')
| -rw-r--r-- | target-arm/neon_helper.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/target-arm/neon_helper.c b/target-arm/neon_helper.c index fead1525c4..268af33a6c 100644 --- a/target-arm/neon_helper.c +++ b/target-arm/neon_helper.c @@ -198,6 +198,28 @@ NEON_VOP_ENV(qadd_u16, neon_u16, 2) #undef NEON_FN #undef NEON_USAT +uint32_t HELPER(neon_qadd_u32)(CPUState *env, uint32_t a, uint32_t b) +{ + uint32_t res = a + b; + if (res < a) { + SET_QC(); + res = ~0; + } + return res; +} + +uint64_t HELPER(neon_qadd_u64)(CPUState *env, uint64_t src1, uint64_t src2) +{ + uint64_t res; + + res = src1 + src2; + if (res < src1) { + SET_QC(); + res = ~(uint64_t)0; + } + return res; +} + #define NEON_SSAT(dest, src1, src2, type) do { \ int32_t tmp = (uint32_t)src1 + (uint32_t)src2; \ if (tmp != (type)tmp) { \ @@ -218,6 +240,28 @@ NEON_VOP_ENV(qadd_s16, neon_s16, 2) #undef NEON_FN #undef NEON_SSAT +uint32_t HELPER(neon_qadd_s32)(CPUState *env, uint32_t a, uint32_t b) +{ + uint32_t res = a + b; + if (((res ^ a) & SIGNBIT) && !((a ^ b) & SIGNBIT)) { + SET_QC(); + res = ~(((int32_t)a >> 31) ^ SIGNBIT); + } + return res; +} + +uint64_t HELPER(neon_qadd_s64)(CPUState *env, uint64_t src1, uint64_t src2) +{ + uint64_t res; + + res = src1 + src2; + if (((res ^ src1) & SIGNBIT64) && !((src1 ^ src2) & SIGNBIT64)) { + SET_QC(); + res = ((int64_t)src1 >> 63) ^ ~SIGNBIT64; + } + return res; +} + #define NEON_USAT(dest, src1, src2, type) do { \ uint32_t tmp = (uint32_t)src1 - (uint32_t)src2; \ if (tmp != (type)tmp) { \ @@ -234,6 +278,29 @@ NEON_VOP_ENV(qsub_u16, neon_u16, 2) #undef NEON_FN #undef NEON_USAT +uint32_t HELPER(neon_qsub_u32)(CPUState *env, uint32_t a, uint32_t b) +{ + uint32_t res = a - b; + if (res > a) { + SET_QC(); + res = 0; + } + return res; +} + +uint64_t HELPER(neon_qsub_u64)(CPUState *env, uint64_t src1, uint64_t src2) +{ + uint64_t res; + + if (src1 < src2) { + SET_QC(); + res = 0; + } else { + res = src1 - src2; + } + return res; +} + #define NEON_SSAT(dest, src1, src2, type) do { \ int32_t tmp = (uint32_t)src1 - (uint32_t)src2; \ if (tmp != (type)tmp) { \ @@ -254,6 +321,28 @@ NEON_VOP_ENV(qsub_s16, neon_s16, 2) #undef NEON_FN #undef NEON_SSAT +uint32_t HELPER(neon_qsub_s32)(CPUState *env, uint32_t a, uint32_t b) +{ + uint32_t res = a - b; + if (((res ^ a) & SIGNBIT) && ((a ^ b) & SIGNBIT)) { + SET_QC(); + res = ~(((int32_t)a >> 31) ^ SIGNBIT); + } + return res; +} + +uint64_t HELPER(neon_qsub_s64)(CPUState *env, uint64_t src1, uint64_t src2) +{ + uint64_t res; + + res = src1 - src2; + if (((res ^ src1) & SIGNBIT64) && ((src1 ^ src2) & SIGNBIT64)) { + SET_QC(); + res = ((int64_t)src1 >> 63) ^ ~SIGNBIT64; + } + return res; +} + #define NEON_FN(dest, src1, src2) dest = (src1 + src2) >> 1 NEON_VOP(hadd_s8, neon_s8, 4) NEON_VOP(hadd_u8, neon_u8, 4) |