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
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -emit-llvm -o - %s | FileCheck %s
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void loop1(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}loop1{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP1:.*]]
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#pragma clang loop vectorize(enable) vectorize_width(1)
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for (int i = 0; i < Length; i++)
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List[i] = i * 2;
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}
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// Here, vectorize.enable should be set, obviously, but also check that
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// metadata isn't added twice.
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void loop2(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}loop2{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP2:.*]]
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#pragma clang loop vectorize(enable) vectorize_width(2)
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for (int i = 0; i < Length; i++)
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List[i] = i * 2;
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}
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// Test that we do *not* imply vectorize.enable.
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void loop3(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}loop3{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP3:.*]]
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#pragma clang loop vectorize_width(1)
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for (int i = 0; i < Length; i++)
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List[i] = i * 2;
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}
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// Test that we *do* imply vectorize.enable.
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void loop4(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}loop4{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP4:.*]]
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#pragma clang loop vectorize_width(2)
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for (int i = 0; i < Length; i++)
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List[i] = i * 2;
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}
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// CHECK: ![[LOOP1]] = distinct !{![[LOOP1]], [[MP:![0-9]+]], ![[VEC_WIDTH_1:.*]], ![[VEC_ENABLE:.*]]}
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// CHECK: ![[VEC_WIDTH_1]] = !{!"llvm.loop.vectorize.width", i32 1}
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// CHECK: ![[VEC_ENABLE]] = !{!"llvm.loop.vectorize.enable", i1 true}
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// CHECK: ![[LOOP2]] = distinct !{![[LOOP2]], [[MP]], ![[VEC_WIDTH_2:.*]], ![[VEC_ENABLE]]}
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// CHECK: ![[VEC_WIDTH_2]] = !{!"llvm.loop.vectorize.width", i32 2}
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// CHECK: ![[LOOP3]] = distinct !{![[LOOP3]], [[MP]], ![[VEC_WIDTH_1]]}
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// CHECK: ![[LOOP4]] = distinct !{![[LOOP4]], [[MP]], ![[VEC_WIDTH_2]], ![[VEC_ENABLE]]}
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