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[SYCL] Don't run SYCLOptimizeBarriersPass with O0 #20037

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Merged
merged 8 commits into from
Sep 16, 2025
Merged

[SYCL] Don't run SYCLOptimizeBarriersPass with O0 #20037

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b78605b
[SYCL] Don't run SYCLOptimizeBarriersPass with O0
MrSidims Sep 10, 2025
96a7a7a
format
MrSidims Sep 10, 2025
1aeedf7
add test
MrSidims Sep 10, 2025
68a84f0
adjust test
MrSidims Sep 10, 2025
73266d4
move the test
MrSidims Sep 11, 2025
71bdb3f
adjust test
MrSidims Sep 16, 2025
6347c9c
Merge remote-tracking branch 'origin/sycl' into run-barriers-with-o0
MrSidims Sep 16, 2025
3496abb
shorted test
MrSidims Sep 16, 2025
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5 changes: 3 additions & 2 deletions clang/lib/CodeGen/BackendUtil.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1093,8 +1093,9 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
ThinOrFullLTOPhase) {
MPM.addPass(createModuleToFunctionPassAdaptor(
InferAddressSpacesPass(clang::targets::SPIR_GENERIC_AS)));
MPM.addPass(
createModuleToFunctionPassAdaptor(SYCLOptimizeBarriersPass()));
if (Level != OptimizationLevel::O0)
MPM.addPass(createModuleToFunctionPassAdaptor(
SYCLOptimizeBarriersPass()));
});
}

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10 changes: 10 additions & 0 deletions clang/test/CodeGenSYCL/kernel-early-optimization-pipeline.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
// CHECK: InferFunctionAttrsPass
// CHECK: AlwaysInlinerPass
// CHECK: ModuleInlinerWrapperPass
// CHECK: SYCLOptimizeBarriersPass
// CHECK: ConstantMergePass
// CHECK: SYCLMutatePrintfAddrspacePass
// CHECK: SYCLPropagateAspectsUsagePass
Expand All @@ -22,4 +23,13 @@
//
// RUN: %clang_cc1 -O2 -fsycl-is-device -triple spir64-unknown-unknown %s -mdebug-pass Structure -emit-llvm -fno-sycl-early-optimizations -o /dev/null 2>&1 | FileCheck %s --check-prefix=CHECK-NOEARLYOPT
// CHECK-NOEARLYOPT-NOT: ConstantMergePass1
// CHECK-NOEARLYOPT-NOT: SYCLOptimizeBarriersPass
// CHECK-NOEARLYOPT: SYCLMutatePrintfAddrspacePass

// RUN: %clang_cc1 -O0 -fsycl-is-device -triple spir64-unknown-unknown %s -mdebug-pass Structure -emit-llvm -o /dev/null 2>&1 | FileCheck %s --check-prefix=CHECK-O0
// CHECK-O0-NOT: SYCLOptimizeBarriersPass

// Passes registered via registerOptimizerLastEPCallback don't run on empty
// code
__attribute__((sycl_device)) void bar() {
}
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