[Openmp-commits] [openmp] fd70f70 - [OpenMP][NVPTX] Replaced CUDA builtin vars with LLVM intrinsics

[Shilei Tian via Openmp-commits]

Author: Shilei Tian
Date: 2021-01-20T12:02:06-05:00
New Revision: fd70f70d1e02752f411fcf923fddda31cce376ae

URL: https://github.com/llvm/llvm-project/commit/fd70f70d1e02752f411fcf923fddda31cce376ae
DIFF: https://github.com/llvm/llvm-project/commit/fd70f70d1e02752f411fcf923fddda31cce376ae.diff

LOG: [OpenMP][NVPTX] Replaced CUDA builtin vars with LLVM intrinsics

Replaced CUDA builtin vars with LLVM intrinsics such that we don't need
definitions of those intrinsics.

Reviewed By: JonChesterfield

Differential Revision: https://reviews.llvm.org/D95013

Added: 
    

Modified: 
    openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.cu

Removed: 
    


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diff  --git a/openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.cu b/openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.cu
index 8052b92a7dee..b5ef549ece57 100644
--- a/openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.cu
+++ b/openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.cu
@@ -115,10 +115,12 @@ DEVICE void __kmpc_impl_threadfence_block() { __threadfence_block(); }
 DEVICE void __kmpc_impl_threadfence_system() { __threadfence_system(); }
 
 // Calls to the NVPTX layer (assuming 1D layout)
-DEVICE int GetThreadIdInBlock() { return threadIdx.x; }
-DEVICE int GetBlockIdInKernel() { return blockIdx.x; }
-DEVICE int GetNumberOfBlocksInKernel() { return gridDim.x; }
-DEVICE int GetNumberOfThreadsInBlock() { return blockDim.x; }
+DEVICE int GetThreadIdInBlock() { return __nvvm_read_ptx_sreg_tid_x(); }
+DEVICE int GetBlockIdInKernel() { return __nvvm_read_ptx_sreg_ctaid_x(); }
+DEVICE int GetNumberOfBlocksInKernel() {
+  return __nvvm_read_ptx_sreg_nctaid_x();
+}
+DEVICE int GetNumberOfThreadsInBlock() { return __nvvm_read_ptx_sreg_ntid_x(); }
 DEVICE unsigned GetWarpId() { return GetThreadIdInBlock() / WARPSIZE; }
 DEVICE unsigned GetLaneId() { return GetThreadIdInBlock() & (WARPSIZE - 1); }