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Since C++11, the C++ standard has a forward progress guarantee [intro.progress], so all such functions must have the `mustprogress` requirement. In addition, from C11 and onwards, loops without a non-zero constant conditional or no conditional are also required to make progress (C11 6.8.5p6). This patch implements these attribute deductions so they can be used by the optimization passes. Differential Revision: https://reviews.llvm.org/D86841
48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
// RUN: %clang_cc1 -triple hexagon -std=c++11 -emit-llvm -o - %s | FileCheck %s
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void pipeline_disabled(int *List, int Length, int Value) {
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// CHECK-LABEL: define {{.*}} @_Z17pipeline_disabled
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#pragma clang loop pipeline(disable)
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for (int i = 0; i < Length; i++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_1:.*]]
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List[i] = Value;
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}
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}
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void pipeline_not_disabled(int *List, int Length, int Value) {
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// CHECK-LABEL: define {{.*}} @_Z21pipeline_not_disabled
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for (int i = 0; i < Length; i++) {
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List[i] = Value;
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}
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}
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void pipeline_initiation_interval(int *List, int Length, int Value) {
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// CHECK-LABEL: define {{.*}} @_Z28pipeline_initiation_interval
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#pragma clang loop pipeline_initiation_interval(10)
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for (int i = 0; i < Length; i++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_3:.*]]
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List[i] = Value;
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}
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}
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void pipeline_disabled_on_nested_loop(int *List, int Length, int Value) {
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// CHECK-LABEL: define {{.*}} @_Z32pipeline_disabled_on_nested_loop
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for (int i = 0; i < Length; i++) {
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#pragma clang loop pipeline(disable)
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for (int j = 0; j < Length; j++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_4:.*]]
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List[i * Length + j] = Value;
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}
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}
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}
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// CHECK: ![[LOOP_1]] = distinct !{![[LOOP_1]], [[MP:![0-9]+]], ![[PIPELINE_DISABLE:.*]]}
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// CHECK: ![[PIPELINE_DISABLE]] = !{!"llvm.loop.pipeline.disable", i1 true}
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// CHECK-NOT:llvm.loop.pipeline
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// CHECK: ![[LOOP_3]] = distinct !{![[LOOP_3]], [[MP]], ![[PIPELINE_II_10:.*]]}
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// CHECK: ![[PIPELINE_II_10]] = !{!"llvm.loop.pipeline.initiationinterval", i32 10}
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// CHECK: ![[LOOP_4]] = distinct !{![[LOOP_4]], [[MP]], ![[PIPELINE_DISABLE]]}
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