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
25 lines
723 B
C++
25 lines
723 B
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -emit-llvm -o - %s | FileCheck %s
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void while_test(int *List, int Length, int *List2, int Length2) {
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// CHECK: define {{.*}} @_Z10while_test
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int i = 0;
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#pragma clang loop distribute(enable)
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while (i < Length) {
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// CHECK: br label {{.*}}, !llvm.loop ![[LOOP_1:.*]]
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List[i] = i * 2;
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i++;
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}
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i = 0;
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while (i < Length2) {
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// CHECK: br label {{.*}}, !llvm.loop [[LOOP_2:![0-9]+]]
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List2[i] = i * 2;
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i++;
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}
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}
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// CHECK: ![[LOOP_1]] = distinct !{![[LOOP_1]], [[MP:![0-9]+]], ![[DISTRIBUTE_ENABLE:.*]]}
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// CHECK: ![[DISTRIBUTE_ENABLE]] = !{!"llvm.loop.distribute.enable", i1 true}
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// CHECK: [[LOOP_2]] = distinct !{[[LOOP_2]], [[MP]]}
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