0216854917
Let's try this again; this has been reverted/recommited a few times. Last time
this got reverted because for this loop:
void a() {
#pragma clang loop vectorize(disable)
for (;;)
;
}
vectorisation was incorrectly enabled and the vectorize.enable metadata was set
due to a logic error. But with this fixed, we now imply vectorisation when:
1) vectorisation is enabled, which means: VectorizeWidth > 1,
2) and don't want to add it when it is disabled or enabled, otherwise we would
be incorrectly setting it or duplicating the metadata, respectively.
This should fix PR27643.
Differential Revision: https://reviews.llvm.org/D69628
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]], ![[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]], ![[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]], ![[VEC_WIDTH_1]]}
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// CHECK: ![[LOOP4]] = distinct !{![[LOOP4]], ![[VEC_WIDTH_2]], ![[VEC_ENABLE]]}
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