From: Jonas Hahnfeld <Hahnfeld@itc.rwth-aachen.de>
Date: Fri, 17 Feb 2017 18:32:58 +0000 (+0000)
Subject: [OpenMP] Fix cancellation point in task with no cancel
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f5e70210f247a8f746d0664f88e89140f959f15b;p=clang

[OpenMP] Fix cancellation point in task with no cancel

With tasks, the cancel may happen in another task. This has a different
region info which means that we can't find it here.

Differential Revision: https://reviews.llvm.org/D30091

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@295474 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CGOpenMPRuntime.cpp b/lib/CodeGen/CGOpenMPRuntime.cpp
index 099fa5905b..92d5ee748d 100644
--- a/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -4716,7 +4716,9 @@ void CGOpenMPRuntime::emitCancellationPointCall(
   // global_tid, kmp_int32 cncl_kind);
   if (auto *OMPRegionInfo =
           dyn_cast_or_null<CGOpenMPRegionInfo>(CGF.CapturedStmtInfo)) {
-    if (OMPRegionInfo->hasCancel()) {
+    // For 'cancellation point taskgroup', the task region info may not have a
+    // cancel. This may instead happen in another adjacent task.
+    if (CancelRegion == OMPD_taskgroup || OMPRegionInfo->hasCancel()) {
       llvm::Value *Args[] = {
           emitUpdateLocation(CGF, Loc), getThreadID(CGF, Loc),
           CGF.Builder.getInt32(getCancellationKind(CancelRegion))};
diff --git a/test/OpenMP/cancellation_point_codegen.cpp b/test/OpenMP/cancellation_point_codegen.cpp
index 22969141af..de65c11402 100644
--- a/test/OpenMP/cancellation_point_codegen.cpp
+++ b/test/OpenMP/cancellation_point_codegen.cpp
@@ -78,6 +78,12 @@ for (int i = 0; i < argc; ++i) {
 }
 // CHECK: call i8* @__kmpc_omp_task_alloc(
 // CHECK: call i32 @__kmpc_omp_task(
+#pragma omp task
+{
+#pragma omp cancellation point taskgroup
+}
+// CHECK: call i8* @__kmpc_omp_task_alloc(
+// CHECK: call i32 @__kmpc_omp_task(
 #pragma omp parallel sections
 {
   {
@@ -125,6 +131,15 @@ for (int i = 0; i < argc; ++i) {
 // CHECK: [[RETURN]]
 // CHECK: ret i32 0
 
+// CHECK: define internal i32 @{{[^(]+}}(i32
+// CHECK: [[RES:%.+]] = call i32 @__kmpc_cancellationpoint(%ident_t* {{[^,]+}}, i32 {{[^,]+}}, i32 4)
+// CHECK: [[CMP:%.+]] = icmp ne i32 [[RES]], 0
+// CHECK: br i1 [[CMP]], label %[[EXIT:[^,]+]],
+// CHECK: [[EXIT]]
+// 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: [[RES:%.+]] = call i32 @__kmpc_cancellationpoint(%ident_t* {{[^,]+}}, i32 [[GTID:%.+]], i32 3)