[libc-commits] [libc] 2e93dd0 - [libc] Fix hanging test on NVPTX due to lack of warp sync

[Joseph Huber via libc-commits]

Author: Joseph Huber
Date: 2023-05-04T21:38:24-05:00
New Revision: 2e93dd06134d4e71436b0aec3f668e0302b6e7ea

URL: https://github.com/llvm/llvm-project/commit/2e93dd06134d4e71436b0aec3f668e0302b6e7ea
DIFF: https://github.com/llvm/llvm-project/commit/2e93dd06134d4e71436b0aec3f668e0302b6e7ea.diff

LOG: [libc] Fix hanging test on NVPTX due to lack of warp sync

Previously this wasn't implemented because it's effectively a no-op.
However, this should be safe to emit on sm_60 architectures. It's
important because it carries semantic importance for whether or not
something can be moved. So we should always emit this instrinsic.

Differential Revision: https://reviews.llvm.org/D149923

Added: 
    

Modified: 
    libc/src/__support/GPU/nvptx/utils.h

Removed: 
    


################################################################################
diff  --git a/libc/src/__support/GPU/nvptx/utils.h b/libc/src/__support/GPU/nvptx/utils.h
index 9f20edf16c62..763675735a2b 100644
--- a/libc/src/__support/GPU/nvptx/utils.h
+++ b/libc/src/__support/GPU/nvptx/utils.h
@@ -130,11 +130,7 @@ LIBC_INLINE uint32_t get_lane_size() { return LANE_SIZE; }
 
 /// Waits for all threads in the warp to reconverge for independent scheduling.
 [[clang::convergent]] LIBC_INLINE void sync_lane(uint64_t mask) {
-#if __CUDA_ARCH__ >= 700
   __nvvm_bar_warp_sync(mask);
-#else
-  (void)mask;
-#endif
 }
 
 } // namespace gpu