================
@@ -149,22 +149,23 @@ _DEFAULT_FN_ATTRS static __inline__ void
__gpu_sync_lane(uint64_t __lane_mask) {
// Shuffles the the lanes inside the warp according to the given index.
_DEFAULT_FN_ATTRS static __inline__ uint32_t
-__gpu_shuffle_idx_u32(uint64_t __lane_mask, uint32_t __idx, uint32_t __x) {
+__gpu_shuffle_idx_u32(uint64_t __lane_mask, uint32_t __idx, uint32_t __x,
+ uint32_t __width) {
uint32_t __mask = (uint32_t)__lane_mask;
- return __nvvm_shfl_sync_idx_i32(__mask, __x, __idx, __gpu_num_lanes() - 1u);
+ return __nvvm_shfl_sync_idx_i32(__mask, __x, __idx,
+ ((__gpu_num_lanes() - __width) << 8u) |
0x1f);
----------------
jhuber6 wrote:
Do you know if this is okay so I can approve the backport? (Also below is my
punishment for forgetting to commit the fix the clang test.)
https://github.com/llvm/llvm-project/pull/125896
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