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      1 //===---- CGOpenMPRuntimeNVPTX.cpp - Interface to OpenMP NVPTX Runtimes ---===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 //
      9 // This provides a class for OpenMP runtime code generation specialized to NVPTX
     10 // targets from generalized CGOpenMPRuntimeGPU class.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "CGOpenMPRuntimeNVPTX.h"
     15 #include "CGOpenMPRuntimeGPU.h"
     16 #include "CodeGenFunction.h"
     17 #include "clang/AST/Attr.h"
     18 #include "clang/AST/DeclOpenMP.h"
     19 #include "clang/AST/StmtOpenMP.h"
     20 #include "clang/AST/StmtVisitor.h"
     21 #include "clang/Basic/Cuda.h"
     22 #include "llvm/ADT/SmallPtrSet.h"
     23 #include "llvm/IR/IntrinsicsNVPTX.h"
     24 
     25 using namespace clang;
     26 using namespace CodeGen;
     27 using namespace llvm::omp;
     28 
     29 CGOpenMPRuntimeNVPTX::CGOpenMPRuntimeNVPTX(CodeGenModule &CGM)
     30     : CGOpenMPRuntimeGPU(CGM) {
     31   if (!CGM.getLangOpts().OpenMPIsDevice)
     32     llvm_unreachable("OpenMP NVPTX can only handle device code.");
     33 }
     34 
     35 llvm::Value *CGOpenMPRuntimeNVPTX::getGPUWarpSize(CodeGenFunction &CGF) {
     36   return CGF.EmitRuntimeCall(
     37       llvm::Intrinsic::getDeclaration(
     38           &CGF.CGM.getModule(), llvm::Intrinsic::nvvm_read_ptx_sreg_warpsize),
     39       "nvptx_warp_size");
     40 }
     41 
     42 llvm::Value *CGOpenMPRuntimeNVPTX::getGPUThreadID(CodeGenFunction &CGF) {
     43   CGBuilderTy &Bld = CGF.Builder;
     44   llvm::Function *F;
     45   F = llvm::Intrinsic::getDeclaration(
     46       &CGF.CGM.getModule(), llvm::Intrinsic::nvvm_read_ptx_sreg_tid_x);
     47   return Bld.CreateCall(F, llvm::None, "nvptx_tid");
     48 }
     49 
     50 llvm::Value *CGOpenMPRuntimeNVPTX::getGPUNumThreads(CodeGenFunction &CGF) {
     51   CGBuilderTy &Bld = CGF.Builder;
     52   llvm::Function *F;
     53   F = llvm::Intrinsic::getDeclaration(
     54       &CGF.CGM.getModule(), llvm::Intrinsic::nvvm_read_ptx_sreg_ntid_x);
     55   return Bld.CreateCall(F, llvm::None, "nvptx_num_threads");
     56 }
     57