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ac73b73c16
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
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
// RUN: %clang_cc1 -triple arm-none-eabi -std=c++11 -emit-llvm -o - %s | FileCheck %s
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void unroll_and_jam(int *List, int Length, int Value) {
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// CHECK-LABEL: define {{.*}} @_Z14unroll_and_jam
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#pragma unroll_and_jam
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for (int i = 0; i < Length; i++) {
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for (int j = 0; j < Length; j++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_1:.*]]
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_2:.*]]
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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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void unroll_and_jam_count(int *List, int Length, int Value) {
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// CHECK-LABEL: define {{.*}} @_Z20unroll_and_jam_count
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#pragma unroll_and_jam(4)
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for (int i = 0; i < Length; i++) {
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for (int j = 0; j < Length; j++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_3:.*]]
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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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void nounroll_and_jam(int *List, int Length, int Value) {
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// CHECK-LABEL: define {{.*}} @_Z16nounroll_and_jam
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#pragma nounroll_and_jam
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for (int i = 0; i < Length; i++) {
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for (int j = 0; j < Length; j++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_5:.*]]
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_6:.*]]
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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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void clang_unroll_plus_nounroll_and_jam(int *List, int Length, int Value) {
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// CHECK-LABEL: define {{.*}} @_Z34clang_unroll_plus_nounroll_and_jam
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#pragma nounroll_and_jam
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#pragma unroll(4)
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for (int i = 0; i < Length; i++) {
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for (int j = 0; j < Length; j++) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_7:.*]]
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_8:.*]]
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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_2]] = distinct !{![[LOOP_2]], [[MP:![0-9]+]], ![[UNJ_ENABLE:.*]]}
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// CHECK: ![[UNJ_ENABLE]] = !{!"llvm.loop.unroll_and_jam.enable"}
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// CHECK: ![[LOOP_4]] = distinct !{![[LOOP_4]], [[MP]], ![[UNJ_4:.*]]}
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// CHECK: ![[UNJ_4]] = !{!"llvm.loop.unroll_and_jam.count", i32 4}
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// CHECK: ![[LOOP_6]] = distinct !{![[LOOP_6]], [[MP]], ![[UNJ_DISABLE:.*]]}
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// CHECK: ![[UNJ_DISABLE]] = !{!"llvm.loop.unroll_and_jam.disable"}
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// CHECK: ![[LOOP_8]] = distinct !{![[LOOP_8]], [[MP]], ![[UNJ_DISABLE:.*]], ![[UNROLL_4:.*]]}
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// CHECK: ![[UNROLL_4]] = !{!"llvm.loop.unroll.count", i32 4}
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