[mlir][OpenMP] set correct insert point after creating a barrier #142997
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@llvm/pr-subscribers-mlir-llvm @llvm/pr-subscribers-flang-openmp Author: Tom Eccles (tblah) ChangesFixes #138436 Full diff: https://github.com/llvm/llvm-project/pull/142997.diff 2 Files Affected:
diff --git a/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp b/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
index 4a6605e9c74cb..ec1a9c909c94a 100644
--- a/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
@@ -5737,7 +5737,13 @@ convertHostOrTargetOperation(Operation *op, llvm::IRBuilderBase &builder,
llvm::OpenMPIRBuilder::InsertPointOrErrorTy afterIP =
ompBuilder->createBarrier(builder.saveIP(),
llvm::omp::OMPD_barrier);
- return handleError(afterIP, *op);
+ LogicalResult res = handleError(afterIP, *op);
+ if (res.succeeded()) {
+ // If the barrier generated a cancellation check, the insertion
+ // point might now need to be changed to a new continuation block
+ builder.restoreIP(*afterIP);
+ }
+ return res;
})
.Case([&](omp::TaskyieldOp op) {
if (failed(checkImplementationStatus(*op)))
diff --git a/mlir/test/Target/LLVMIR/openmp-barrier-cancel.mlir b/mlir/test/Target/LLVMIR/openmp-barrier-cancel.mlir
new file mode 100644
index 0000000000000..c4b245667a1f3
--- /dev/null
+++ b/mlir/test/Target/LLVMIR/openmp-barrier-cancel.mlir
@@ -0,0 +1,50 @@
+// RUN: mlir-translate --mlir-to-llvmir %s | FileCheck %s
+
+// Regression test for a compiler crash. Ensure that the insertion point is set
+// correctly after the barrier's cancel check
+
+llvm.func @test() {
+ omp.parallel {
+ omp.cancel cancellation_construct_type(parallel)
+ omp.barrier
+ omp.terminator
+ }
+ llvm.return
+}
+
+// CHECK-LABEL: define internal void @test..omp_par
+// CHECK: omp.par.entry:
+// CHECK: %[[VAL_4:.*]] = alloca i32, align 4
+// CHECK: %[[VAL_5:.*]] = load i32, ptr %[[VAL_6:.*]], align 4
+// CHECK: store i32 %[[VAL_5]], ptr %[[VAL_4]], align 4
+// CHECK: %[[VAL_7:.*]] = load i32, ptr %[[VAL_4]], align 4
+// CHECK: br label %[[VAL_8:.*]]
+// CHECK: omp.region.after_alloca: ; preds = %[[VAL_9:.*]]
+// CHECK: br label %[[VAL_10:.*]]
+// CHECK: omp.par.region: ; preds = %[[VAL_8]]
+// CHECK: br label %[[VAL_11:.*]]
+// CHECK: omp.par.region1: ; preds = %[[VAL_10]]
+// CHECK: %[[VAL_12:.*]] = call i32 @__kmpc_global_thread_num(ptr @1)
+// CHECK: %[[VAL_13:.*]] = call i32 @__kmpc_cancel(ptr @1, i32 %[[VAL_12]], i32 1)
+// CHECK: %[[VAL_14:.*]] = icmp eq i32 %[[VAL_13]], 0
+// CHECK: br i1 %[[VAL_14]], label %[[VAL_15:.*]], label %[[VAL_16:.*]]
+// CHECK: omp.par.region1.cncl: ; preds = %[[VAL_11]]
+// CHECK: %[[VAL_17:.*]] = call i32 @__kmpc_global_thread_num(ptr @1)
+// CHECK: %[[VAL_18:.*]] = call i32 @__kmpc_cancel_barrier(ptr @2, i32 %[[VAL_17]])
+// CHECK: br label %[[VAL_19:.*]]
+// CHECK: omp.par.region1.split: ; preds = %[[VAL_11]]
+// CHECK: %[[VAL_20:.*]] = call i32 @__kmpc_global_thread_num(ptr @1)
+// CHECK: %[[VAL_21:.*]] = call i32 @__kmpc_cancel_barrier(ptr @3, i32 %[[VAL_20]])
+// CHECK: %[[VAL_22:.*]] = icmp eq i32 %[[VAL_21]], 0
+// CHECK: br i1 %[[VAL_22]], label %[[VAL_23:.*]], label %[[VAL_24:.*]]
+// CHECK: omp.par.region1.split.cncl: ; preds = %[[VAL_15]]
+// CHECK: br label %[[VAL_19]]
+// CHECK: omp.par.region1.split.cont: ; preds = %[[VAL_15]]
+// CHECK: br label %[[VAL_25:.*]]
+// CHECK: omp.region.cont: ; preds = %[[VAL_23]]
+// CHECK: br label %[[VAL_26:.*]]
+// CHECK: omp.par.pre_finalize: ; preds = %[[VAL_25]]
+// CHECK: br label %[[VAL_19]]
+// CHECK: omp.par.exit.exitStub: ; preds = %[[VAL_26]], %[[VAL_24]], %[[VAL_16]]
+// CHECK: ret void
+
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@llvm/pr-subscribers-mlir-openmp Author: Tom Eccles (tblah) ChangesFixes #138436 Full diff: https://github.com/llvm/llvm-project/pull/142997.diff 2 Files Affected:
diff --git a/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp b/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
index 4a6605e9c74cb..ec1a9c909c94a 100644
--- a/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
@@ -5737,7 +5737,13 @@ convertHostOrTargetOperation(Operation *op, llvm::IRBuilderBase &builder,
llvm::OpenMPIRBuilder::InsertPointOrErrorTy afterIP =
ompBuilder->createBarrier(builder.saveIP(),
llvm::omp::OMPD_barrier);
- return handleError(afterIP, *op);
+ LogicalResult res = handleError(afterIP, *op);
+ if (res.succeeded()) {
+ // If the barrier generated a cancellation check, the insertion
+ // point might now need to be changed to a new continuation block
+ builder.restoreIP(*afterIP);
+ }
+ return res;
})
.Case([&](omp::TaskyieldOp op) {
if (failed(checkImplementationStatus(*op)))
diff --git a/mlir/test/Target/LLVMIR/openmp-barrier-cancel.mlir b/mlir/test/Target/LLVMIR/openmp-barrier-cancel.mlir
new file mode 100644
index 0000000000000..c4b245667a1f3
--- /dev/null
+++ b/mlir/test/Target/LLVMIR/openmp-barrier-cancel.mlir
@@ -0,0 +1,50 @@
+// RUN: mlir-translate --mlir-to-llvmir %s | FileCheck %s
+
+// Regression test for a compiler crash. Ensure that the insertion point is set
+// correctly after the barrier's cancel check
+
+llvm.func @test() {
+ omp.parallel {
+ omp.cancel cancellation_construct_type(parallel)
+ omp.barrier
+ omp.terminator
+ }
+ llvm.return
+}
+
+// CHECK-LABEL: define internal void @test..omp_par
+// CHECK: omp.par.entry:
+// CHECK: %[[VAL_4:.*]] = alloca i32, align 4
+// CHECK: %[[VAL_5:.*]] = load i32, ptr %[[VAL_6:.*]], align 4
+// CHECK: store i32 %[[VAL_5]], ptr %[[VAL_4]], align 4
+// CHECK: %[[VAL_7:.*]] = load i32, ptr %[[VAL_4]], align 4
+// CHECK: br label %[[VAL_8:.*]]
+// CHECK: omp.region.after_alloca: ; preds = %[[VAL_9:.*]]
+// CHECK: br label %[[VAL_10:.*]]
+// CHECK: omp.par.region: ; preds = %[[VAL_8]]
+// CHECK: br label %[[VAL_11:.*]]
+// CHECK: omp.par.region1: ; preds = %[[VAL_10]]
+// CHECK: %[[VAL_12:.*]] = call i32 @__kmpc_global_thread_num(ptr @1)
+// CHECK: %[[VAL_13:.*]] = call i32 @__kmpc_cancel(ptr @1, i32 %[[VAL_12]], i32 1)
+// CHECK: %[[VAL_14:.*]] = icmp eq i32 %[[VAL_13]], 0
+// CHECK: br i1 %[[VAL_14]], label %[[VAL_15:.*]], label %[[VAL_16:.*]]
+// CHECK: omp.par.region1.cncl: ; preds = %[[VAL_11]]
+// CHECK: %[[VAL_17:.*]] = call i32 @__kmpc_global_thread_num(ptr @1)
+// CHECK: %[[VAL_18:.*]] = call i32 @__kmpc_cancel_barrier(ptr @2, i32 %[[VAL_17]])
+// CHECK: br label %[[VAL_19:.*]]
+// CHECK: omp.par.region1.split: ; preds = %[[VAL_11]]
+// CHECK: %[[VAL_20:.*]] = call i32 @__kmpc_global_thread_num(ptr @1)
+// CHECK: %[[VAL_21:.*]] = call i32 @__kmpc_cancel_barrier(ptr @3, i32 %[[VAL_20]])
+// CHECK: %[[VAL_22:.*]] = icmp eq i32 %[[VAL_21]], 0
+// CHECK: br i1 %[[VAL_22]], label %[[VAL_23:.*]], label %[[VAL_24:.*]]
+// CHECK: omp.par.region1.split.cncl: ; preds = %[[VAL_15]]
+// CHECK: br label %[[VAL_19]]
+// CHECK: omp.par.region1.split.cont: ; preds = %[[VAL_15]]
+// CHECK: br label %[[VAL_25:.*]]
+// CHECK: omp.region.cont: ; preds = %[[VAL_23]]
+// CHECK: br label %[[VAL_26:.*]]
+// CHECK: omp.par.pre_finalize: ; preds = %[[VAL_25]]
+// CHECK: br label %[[VAL_19]]
+// CHECK: omp.par.exit.exitStub: ; preds = %[[VAL_26]], %[[VAL_24]], %[[VAL_16]]
+// CHECK: ret void
+
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bhandarkar-pranav
approved these changes
Jun 5, 2025
|
The CI failure is the buildkite bug with precompiled headers discussed in #141927 and so is not related to this PR. |
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Fixes #138436