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| author | Alexey Bataev <a.bataev@hotmail.com> | 2018-12-10 14:29:05 +0000 |
|---|---|---|
| committer | Alexey Bataev <a.bataev@hotmail.com> | 2018-12-10 14:29:05 +0000 |
| commit | 2586b22bb78b3a95bb3e8cfb36b6f6f540fb3324 (patch) | |
| tree | 329056f18bea28e88a51d30275d76a968216ac57 /openmp | |
| parent | 1086b72b83ad7aa10cb9e8709356a9d9ac83f599 (diff) | |
[OPENMP][NVPTX]Enable fast shuffles on 64bit values only if CUDA >= 9.
Summary:
Shuffle on 64bit data is allowed only for CUDA >= 9.0. Also, fixed the
constant for the mask, need one extra L in the end.
Reviewers: gtbercea, kkwli0
Subscribers: guansong, caomhin, openmp-commits
Differential Revision: https://reviews.llvm.org/D55440
Diffstat (limited to 'openmp')
| -rw-r--r-- | openmp/libomptarget/deviceRTLs/nvptx/src/reduction.cu | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/openmp/libomptarget/deviceRTLs/nvptx/src/reduction.cu b/openmp/libomptarget/deviceRTLs/nvptx/src/reduction.cu index a05a6e016f9..2546302bc42 100644 --- a/openmp/libomptarget/deviceRTLs/nvptx/src/reduction.cu +++ b/openmp/libomptarget/deviceRTLs/nvptx/src/reduction.cu @@ -76,7 +76,17 @@ EXTERN int32_t __kmpc_shuffle_int32(int32_t val, int16_t delta, int16_t size) { } EXTERN int64_t __kmpc_shuffle_int64(int64_t val, int16_t delta, int16_t size) { - return __SHFL_DOWN_SYNC(0xFFFFFFFFFFFFFFFFL, val, delta, size); +#if defined(CUDART_VERSION) && CUDART_VERSION >= 9000 + return __SHFL_DOWN_SYNC(0xFFFFFFFFFFFFFFFFLL, (long long)val, (unsigned)delta, + (int)size); +#else + int lo, hi; + asm volatile("mov.b64 {%0,%1}, %2;" : "=r"(lo), "=r"(hi) : "l"(val)); + hi = __SHFL_DOWN_SYNC(0xFFFFFFFF, hi, delta, size); + lo = __SHFL_DOWN_SYNC(0xFFFFFFFF, lo, delta, size); + asm volatile("mov.b64 %0, {%1,%2};" : "=l"(val) : "r"(lo), "r"(hi)); + return val; +#endif } static INLINE void gpu_regular_warp_reduce(void *reduce_data, |