[OpenMP] Add function attribute for triggering data sharing.
Summary: The backend should only emit data sharing code for the cases where it is needed. A new function attribute is used by Clang to enable data sharing only for the cases where OpenMP semantics require it and there are variables that need to be shared. Reviewers: hfinkel, Hahnfeld, ABataev, carlo.bertolli, caomhin Reviewed By: ABataev Subscribers: cfe-commits, jholewinski Differential Revision: https://reviews.llvm.org/D41123 llvm-svn: 320527
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@ -942,6 +942,8 @@ void CGOpenMPRuntimeNVPTX::emitGenericParallelCall(
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llvm::Value *ID = Bld.CreateBitOrPointerCast(WFn, CGM.Int8PtrTy);
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if (!CapturedVars.empty()) {
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// There's somehting to share, add the attribute
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CGF.CurFn->addFnAttr("has-nvptx-shared-depot");
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// Prepare for parallel region. Indicate the outlined function.
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Address SharedArgs =
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CGF.CreateDefaultAlignTempAlloca(CGF.VoidPtrPtrTy,
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@ -22,7 +22,7 @@ void test_ds(){
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/// ========= In the worker function ========= ///
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// CK1: define internal void @__omp_offloading_{{.*}}test_ds{{.*}}worker(){{.*}}{
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// CK1: define internal void @__omp_offloading_{{.*}}test_ds{{.*}}worker() [[ATTR1:#.*]] {
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// CK1: [[SHAREDARGS:%.+]] = alloca i8**
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// CK1: call i1 @__kmpc_kernel_parallel(i8** %work_fn, i8*** [[SHAREDARGS]])
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// CK1: [[SHARGSTMP:%.+]] = load i8**, i8*** [[SHAREDARGS]]
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@ -30,7 +30,7 @@ void test_ds(){
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/// ========= In the kernel function ========= ///
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// CK1: {{.*}}define void @__omp_offloading{{.*}}test_ds{{.*}}()
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// CK1: {{.*}}define void @__omp_offloading{{.*}}test_ds{{.*}}() [[ATTR2:#.*]] {
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// CK1: [[SHAREDARGS1:%.+]] = alloca i8**
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// CK1: call void @__kmpc_kernel_prepare_parallel({{.*}}, i8*** [[SHAREDARGS1]], i32 1)
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// CK1: [[SHARGSTMP1:%.+]] = load i8**, i8*** [[SHAREDARGS1]]
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@ -40,7 +40,7 @@ void test_ds(){
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/// ========= In the data sharing wrapper function ========= ///
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// CK1: {{.*}}define internal void @__omp_outlined___wrapper({{.*}}i8**){{.*}}{
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// CK1: {{.*}}define internal void @__omp_outlined___wrapper({{.*}}i8**) [[ATTR1]] {
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// CK1: [[SHAREDARGS2:%.+]] = alloca i8**
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// CK1: store i8** %2, i8*** [[SHAREDARGS2]]
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// CK1: [[SHARGSTMP3:%.+]] = load i8**, i8*** [[SHAREDARGS2]]
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@ -49,4 +49,9 @@ void test_ds(){
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// CK1: [[SHARGSTMP6:%.+]] = load i32*, i32** [[SHARGSTMP5]]
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// CK1: call void @__omp_outlined__({{.*}}, i32* [[SHARGSTMP6]])
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/// ========= Attributes ========= ///
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// CK1-NOT: attributes [[ATTR1]] = { {{.*}}"has-nvptx-shared-depot"{{.*}} }
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// CK1: attributes [[ATTR2]] = { {{.*}}"has-nvptx-shared-depot"{{.*}} }
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#endif
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