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clang-p2996/clang/test/OpenMP/cancel_codegen.cpp
Alexey Bataev 957d856e7e [OPENMP] Fixed codegen for 'omp cancel' construct. 
If 'omp cancel' construct is used in a worksharing construct it may
cause hanging of the software in case if reduction clause is used. Patch fixes this problem by avoiding extra reduction processing for branches that were canceled.

llvm-svn: 287227
2016-11-17 15:12:05 +00:00

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// RUN: %clang_cc1 -verify -fopenmp -triple x86_64-apple-darwin13.4.0 -emit-llvm -o - %s | FileCheck %s
// RUN: %clang_cc1 -fopenmp -x c++ -std=c++11 -triple x86_64-apple-darwin13.4.0 -emit-pch -o %t %s
// RUN: %clang_cc1 -fopenmp -std=c++11 -include-pch %t -fsyntax-only -verify %s -triple x86_64-apple-darwin13.4.0 -emit-llvm -o - | FileCheck %s
// expected-no-diagnostics
#ifndef HEADER
#define HEADER
float flag;
int main (int argc, char **argv) {
// CHECK: [[GTID:%.+]] = call i32 @__kmpc_global_thread_num(
#pragma omp parallel
{
#pragma omp cancel parallel if(flag)
argv[0][0] = argc;
}
// CHECK: call void (%ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(
#pragma omp sections
{
#pragma omp cancel sections
}
// CHECK: call void @__kmpc_for_static_init_4(
// CHECK: call i32 @__kmpc_cancel(
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: call void @__kmpc_for_static_fini(
// CHECK: call void @__kmpc_barrier(%ident_t*
#pragma omp sections
{
#pragma omp cancel sections
#pragma omp section
{
#pragma omp cancel sections
}
}
// CHECK: call void @__kmpc_for_static_init_4(
// CHECK: [[RES:%.+]] = call i32 @__kmpc_cancel(%ident_t* {{[^,]+}}, i32 [[GTID]], i32 3)
// CHECK: [[CMP:%.+]] = icmp ne i32 [[RES]], 0
// CHECK: br i1 [[CMP]], label %[[EXIT:[^,].+]], label %[[CONTINUE:.+]]
// CHECK: [[EXIT]]
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: br label
// CHECK: [[CONTINUE]]
// CHECK: br label
// CHECK: [[RES:%.+]] = call i32 @__kmpc_cancel(%ident_t* {{[^,]+}}, i32 [[GTID]], i32 3)
// CHECK: [[CMP:%.+]] = icmp ne i32 [[RES]], 0
// CHECK: br i1 [[CMP]], label %[[EXIT:[^,].+]], label %[[CONTINUE:.+]]
// CHECK: [[EXIT]]
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: br label
// CHECK: [[CONTINUE]]
// CHECK: br label
// CHECK: call void @__kmpc_for_static_fini(
#pragma omp for
for (int i = 0; i < argc; ++i) {
#pragma omp cancel for if(cancel: flag)
}
// CHECK: call void @__kmpc_for_static_init_4(
// CHECK: [[FLAG:%.+]] = load float, float* @{{.+}},
// CHECK: [[BOOL:%.+]] = fcmp une float [[FLAG]], 0.000000e+00
// CHECK: br i1 [[BOOL]], label %[[THEN:[^,]+]], label %[[ELSE:[^,]+]]
// CHECK: [[THEN]]
// CHECK: [[RES:%.+]] = call i32 @__kmpc_cancel(%ident_t* {{[^,]+}}, i32 [[GTID]], i32 2)
// CHECK: [[CMP:%.+]] = icmp ne i32 [[RES]], 0
// CHECK: br i1 [[CMP]], label %[[EXIT:[^,].+]], label %[[CONTINUE:.+]]
// CHECK: [[EXIT]]
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: br label
// CHECK: [[CONTINUE]]
// CHECK: br label
// CHECK: [[ELSE]]
// CHECK: br label
// CHECK: call void @__kmpc_for_static_fini(
// CHECK: call void @__kmpc_barrier(%ident_t*
#pragma omp task
{
#pragma omp cancel taskgroup
}
// CHECK: call i8* @__kmpc_omp_task_alloc(
// CHECK: call i32 @__kmpc_omp_task(
#pragma omp parallel sections
{
#pragma omp cancel sections
}
// CHECK: call void (%ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(
#pragma omp parallel sections
{
#pragma omp cancel sections
#pragma omp section
{
#pragma omp cancel sections
}
}
// CHECK: call void (%ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(
int r = 0;
#pragma omp parallel for reduction(+: r)
for (int i = 0; i < argc; ++i) {
#pragma omp cancel for
r += i;
}
// CHECK: call void (%ident_t*, i32, void (i32*, i32*, ...)*, ...) @__kmpc_fork_call(
return argc;
}
// CHECK: define internal void @{{[^(]+}}(i32* {{[^,]+}}, i32* {{[^,]+}},
// CHECK: [[FLAG:%.+]] = load float, float* @{{.+}},
// CHECK: [[BOOL:%.+]] = fcmp une float [[FLAG]], 0.000000e+00
// CHECK: br i1 [[BOOL]], label %[[THEN:[^,]+]], label %[[ELSE:[^,]+]]
// CHECK: [[THEN]]
// CHECK: [[RES:%.+]] = call i32 @__kmpc_cancel(%ident_t* {{[^,]+}}, i32 {{[^,]+}}, i32 1)
// CHECK: [[CMP:%.+]] = icmp ne i32 [[RES]], 0
// CHECK: br i1 [[CMP]], label %[[EXIT:[^,]+]],
// CHECK: [[EXIT]]
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: br label %[[RETURN:.+]]
// CHECK: [[ELSE]]
// CHECK: br label
// CHECK: [[RETURN]]
// CHECK: ret void
// CHECK: define internal i32 @{{[^(]+}}(i32
// CHECK: [[RES:%.+]] = call i32 @__kmpc_cancel(%ident_t* {{[^,]+}}, i32 {{[^,]+}}, i32 4)
// CHECK: [[CMP:%.+]] = icmp ne i32 [[RES]], 0
// CHECK: br i1 [[CMP]], label %[[EXIT:[^,]+]],
// CHECK: [[EXIT]]
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: br label %[[RETURN:.+]]
// CHECK: [[RETURN]]
// CHECK: ret i32 0
// CHECK: define internal void @{{[^(]+}}(i32* {{[^,]+}}, i32* {{[^,]+}})
// CHECK: call void @__kmpc_for_static_init_4(
// CHECK: call i32 @__kmpc_cancel(
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: call void @__kmpc_for_static_fini(
// CHECK: ret void
// CHECK: define internal void @{{[^(]+}}(i32* {{[^,]+}}, i32* {{[^,]+}})
// CHECK: call void @__kmpc_for_static_init_4(
// CHECK: [[RES:%.+]] = call i32 @__kmpc_cancel(%ident_t* {{[^,]+}}, i32 [[GTID:%.+]], i32 3)
// CHECK: [[CMP:%.+]] = icmp ne i32 [[RES]], 0
// CHECK: br i1 [[CMP]], label %[[EXIT:[^,].+]], label %[[CONTINUE:.+]]
// CHECK: [[EXIT]]
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: br label
// CHECK: [[CONTINUE]]
// CHECK: br label
// CHECK: [[RES:%.+]] = call i32 @__kmpc_cancel(%ident_t* {{[^,]+}}, i32 [[GTID]], i32 3)
// CHECK: [[CMP:%.+]] = icmp ne i32 [[RES]], 0
// CHECK: br i1 [[CMP]], label %[[EXIT:[^,].+]], label %[[CONTINUE:.+]]
// CHECK: [[EXIT]]
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: br label
// CHECK: [[CONTINUE]]
// CHECK: br label
// CHECK: call void @__kmpc_for_static_fini(
// CHECK: ret void
// CHECK: define internal void @{{[^(]+}}(i32* {{[^,]+}}, i32* {{[^,]+}},
// CHECK: call void @__kmpc_for_static_init_4(
// CHECK: [[RES:%.+]] = call i32 @__kmpc_cancel(%ident_t* {{[^,]+}}, i32 [[GTID:%.+]], i32 2)
// CHECK: [[CMP:%.+]] = icmp ne i32 [[RES]], 0
// CHECK: br i1 [[CMP]], label %[[EXIT:[^,].+]], label %[[CONTINUE:.+]]
// CHECK: [[EXIT]]
// CHECK: call i32 @__kmpc_cancel_barrier(%ident_t*
// CHECK: br label
// CHECK: [[CONTINUE]]
// CHECK: br label
// CHECK: call void @__kmpc_for_static_fini(
// CHECK: call i32 @__kmpc_reduce_nowait(
// CHECK: call void @__kmpc_end_reduce_nowait(
// CHECK: call void @__kmpc_for_static_fini(
// CHECK: ret void
#endif
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