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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
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
// RUN: %clang -g -gcolumn-info -std=c++11 -S -emit-llvm %s -o - | FileCheck %s
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extern int v[2];
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int a = 0, b = 0;
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int main() {
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#line 100
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for (int x : v) {
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if (x)
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++b;
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else
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++a;
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}
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// CHECK: br label {{.*}}, !dbg [[DBG1:![0-9]*]], !llvm.loop [[L1:![0-9]*]]
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#line 200
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while (a)
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if (b)
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++b;
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else
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++a;
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// CHECK: br label {{.*}}, !dbg [[DBG2:![0-9]*]], !llvm.loop [[L2:![0-9]*]]
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#line 300
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for (unsigned i = 0; i < 100; i++) {
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a++;
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for (int y : v)
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++b;
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}
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// CHECK: br label {{.*}}, !dbg [[DBG3:![0-9]*]], !llvm.loop [[L3:![0-9]*]]
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// CHECK: br label {{.*}}, !dbg [[DBG3:![0-9]*]], !llvm.loop [[L4:![0-9]*]]
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// CHECK-DAG: [[L1]] = distinct !{[[L1]], [[SLDBG1:![0-9]*]], [[ELDBG1:![0-9]*]]}
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// CHECK-DAG: [[SLDBG1]] = !DILocation(line: 100, column: 3, scope: !{{.*}})
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// CHECK-DAG: [[ELDBG1]] = !DILocation(line: 105, column: 3, scope: !{{.*}})
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// CHECK-DAG: [[L2]] = distinct !{[[L2]], [[SLDBG2:![0-9]*]], [[ELDBG2:![0-9]*]], [[MP:![0-9]+]]}
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// CHECK-DAG: [[SLDBG2]] = !DILocation(line: 200, column: 3, scope: !{{.*}})
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// CHECK-DAG: [[ELDBG2]] = !DILocation(line: 204, column: 9, scope: !{{.*}})
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// CHECK-DAG: [[L3]] = distinct !{[[L3]], [[SLDBG3:![0-9]*]], [[ELDBG3:![0-9]*]]}
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// CHECK-DAG: [[SLDBG3]] = !DILocation(line: 302, column: 5, scope: !{{.*}})
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// CHECK-DAG: [[ELDBG3]] = !DILocation(line: 303, column: 9, scope: !{{.*}})
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//
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// CHECK-DAG: [[L4]] = distinct !{[[L4]], [[SLDBG4:![0-9]*]], [[ELDBG4:![0-9]*]], [[MP]]}
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// CHECK-DAG: [[SLDBG4]] = !DILocation(line: 300, column: 3, scope: !{{.*}})
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// CHECK-DAG: [[ELDBG4]] = !DILocation(line: 304, column: 3, scope: !{{.*}})
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}
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