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
77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -emit-llvm -o - %s | FileCheck %s
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void test0(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}test0{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP0:.*]]
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#pragma clang loop vectorize(enable)
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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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void test1(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}test1{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP1:.*]]
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#pragma clang loop vectorize(enable) vectorize_predicate(enable)
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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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void test2(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}test2{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP2:.*]]
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#pragma clang loop vectorize(enable) vectorize_predicate(disable)
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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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// vectorize_predicate(enable) implies vectorize(enable)
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void test3(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}test3{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP3:.*]]
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#pragma clang loop vectorize_predicate(enable)
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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 that disabling vectorization means a vectorization width of 1, and
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// also that vectorization_predicate isn't enabled.
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void test4(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}test4{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP4:.*]]
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#pragma clang loop vectorize(disable)
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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 that vectorize and vectorize_predicate are disabled.
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void test5(int *List, int Length) {
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// CHECK-LABEL: @{{.*}}test5{{.*}}(
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP5:.*]]
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#pragma clang loop vectorize(disable) vectorize_predicate(enable)
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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: ![[LOOP0]] = distinct !{![[LOOP0]], [[MP:![0-9]+]], [[GEN3:![0-9]+]]}
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// CHECK: [[MP]] = !{!"llvm.loop.mustprogress"}
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// CHECK-NEXT: [[GEN3]] = !{!"llvm.loop.vectorize.enable", i1 true}
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// CHECK-NEXT: ![[LOOP1]] = distinct !{![[LOOP1]], [[MP]], [[GEN6:![0-9]+]], [[GEN3]]}
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// CHECK-NEXT: [[GEN6]] = !{!"llvm.loop.vectorize.predicate.enable", i1 true}
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// CHECK-NEXT: ![[LOOP2]] = distinct !{![[LOOP2]], [[MP]], [[GEN8:![0-9]+]], [[GEN3]]}
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// CHECK-NEXT: [[GEN8]] = !{!"llvm.loop.vectorize.predicate.enable", i1 false}
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// CHECK-NEXT: ![[LOOP3]] = distinct !{![[LOOP3]], [[MP]], [[GEN6]], [[GEN3]]}
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// CHECK-NEXT: ![[LOOP4]] = distinct !{![[LOOP4]], [[MP]], [[GEN10:![0-9]+]]}
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// CHECK-NEXT: [[GEN10]] = !{!"llvm.loop.vectorize.width", i32 1}
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// CHECK-NEXT: ![[LOOP5]] = distinct !{![[LOOP5]], [[MP]], [[GEN10]]}
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