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[libc] Fix lane-id utility function not using built-in #84902

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Merged
merged 1 commit into from
Mar 12, 2024
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[libc] Fix lane-id utility function not using built-in #84902

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2 changes: 1 addition & 1 deletion libc/src/__support/GPU/nvptx/utils.h
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,7 @@ LIBC_INLINE uint32_t get_lane_size() { return 32; }

/// Returns the id of the thread inside of a CUDA warp executing together.
[[clang::convergent]] LIBC_INLINE uint32_t get_lane_id() {
return get_thread_id() & (get_lane_size() - 1);
return __nvvm_read_ptx_sreg_laneid();
}

/// Returns the bit-mask of active threads in the current warp.
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