2e6e4e6aee
The `assumes` directive is an OpenMP 5.1 feature that allows the user to provide assumptions to the optimizer. Assumptions can refer to directives (`absent` and `contains` clauses), expressions (`holds` clause), or generic properties (`no_openmp_routines`, `ext_ABCD`, ...). The `assumes` spelling is used for assumptions in the global scope while `assume` is used for executable contexts with an associated structured block. This patch only implements the global spellings. While clauses with arguments are "accepted" by the parser, they will simply be ignored for now. The implementation lowers the assumptions directly to the `AssumptionAttr`. Reviewed By: ABataev Differential Revision: https://reviews.llvm.org/D91980
92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
// RUN: %clang_cc1 -verify -fopenmp -ast-print %s | FileCheck %s
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// RUN: %clang_cc1 -fopenmp -x c++ -std=c++11 -emit-pch -o %t %s
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// RUN: %clang_cc1 -fopenmp -std=c++11 -include-pch %t -fsyntax-only -verify %s -ast-print | FileCheck %s
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// RUN: %clang_cc1 -verify -fopenmp-simd -ast-print %s | FileCheck %s
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// RUN: %clang_cc1 -fopenmp-simd -x c++ -std=c++11 -emit-pch -o %t %s
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// RUN: %clang_cc1 -fopenmp-simd -std=c++11 -include-pch %t -fsyntax-only -verify %s -ast-print | FileCheck %s
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// expected-no-diagnostics
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// It is unclear if we want to annotate the template instantiations, e.g., S<int>::foo, or not in the two
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// situations shown below. Since it is always fair to drop assumptions, we do that for now.
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#ifndef HEADER
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#define HEADER
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template <typename T>
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struct S {
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int a;
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// CHECK: template <typename T> struct S {
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// CHECK: void foo() __attribute__((assume("global_assumption"))) {
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void foo() {
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#pragma omp parallel
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{}
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}
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};
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// CHECK: template<> struct S<int> {
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// CHECK: void foo() __attribute__((assume("global_assumption"))) {
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#pragma omp begin assumes no_openmp
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// CHECK: void S_with_assumes_no_call() __attribute__((assume("no_openmp"))) __attribute__((assume("global_assumption"))) {
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void S_with_assumes_no_call() {
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S<int> s;
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s.a = 0;
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}
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// CHECK: void S_with_assumes_call() __attribute__((assume("no_openmp"))) __attribute__((assume("global_assumption"))) {
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void S_with_assumes_call() {
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S<int> s;
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s.a = 0;
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// If this is executed we have UB!
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s.foo();
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}
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#pragma omp end assumes
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// CHECK: void S_without_assumes() __attribute__((assume("global_assumption"))) {
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void S_without_assumes() {
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S<int> s;
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s.foo();
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}
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#pragma omp assumes ext_global_assumption
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// Same as the struct S above but the order in which we instantiate P is different, first outside of an assumes.
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template <typename T>
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struct P {
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// CHECK: template <typename T> struct P {
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// CHECK: void foo() __attribute__((assume("global_assumption"))) {
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int a;
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void foo() {
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#pragma omp parallel
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{}
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}
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};
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// TODO: Avoid the duplication here:
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// CHECK: template<> struct P<int> {
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// CHECK: void foo() __attribute__((assume("global_assumption"))) __attribute__((assume("global_assumption"))) {
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// CHECK: void P_without_assumes() __attribute__((assume("global_assumption"))) {
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void P_without_assumes() {
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P<int> p;
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p.foo();
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}
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#pragma omp begin assumes no_openmp
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// CHECK: void P_with_assumes_no_call() __attribute__((assume("no_openmp"))) __attribute__((assume("global_assumption"))) {
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void P_with_assumes_no_call() {
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P<int> p;
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p.a = 0;
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}
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// CHECK: void P_with_assumes_call() __attribute__((assume("no_openmp"))) __attribute__((assume("global_assumption"))) {
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void P_with_assumes_call() {
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P<int> p;
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p.a = 0;
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// If this is executed we have UB!
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p.foo();
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}
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#pragma omp end assumes
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#endif
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