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[libomptarget][nvptx] Bug fix: Correctly identify the warp master active thread. 

llvm-svn: 327556
This commit is contained in:
George Rokos 2018-03-14 19:11:36 +00:00
parent 4e6b822cdc
commit 59be4b434f
1 changed files with 2 additions and 1 deletions
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3
openmp/libomptarget/deviceRTLs/nvptx/src/data_sharing.cu
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@ -37,7 +37,8 @@ __device__ static bool IsWarpMasterActiveThread() {
unsigned long long Mask = getActiveThreadsMask();
unsigned long long ShNum = WARPSIZE - (getThreadId() % WARPSIZE);
unsigned long long Sh = Mask << ShNum;
return Sh == 0;
// Truncate Sh to the 32 lower bits
return (unsigned)Sh == 0;
}
// Return true if this is the master thread.
__device__ static bool IsMasterThread() {