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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
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
// RUN: %clang_cc1 -debug-info-kind=limited -gno-column-info -std=c++11 -S -emit-llvm %s -o - | FileCheck -allow-deprecated-dag-overlap %s
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// PR19864
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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; // CHECK: add nsw{{.*}}, 1
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else
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++a; // CHECK: add nsw{{.*}}, 1
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// The continuation block if the if statement should not share the
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// location of the ++a statement. The branch back to the start of the loop
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// should be attributed to the loop header line.
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// CHECK: br label
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// CHECK: br label
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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; // CHECK: add nsw{{.*}}, 1
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else
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++a; // CHECK: add nsw{{.*}}, 1
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// CHECK: br label
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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 (; a; )
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if (b)
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++b; // CHECK: add nsw{{.*}}, 1
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else
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++a; // CHECK: add nsw{{.*}}, 1
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// CHECK: br label
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// CHECK: br label {{.*}}, !dbg [[DBG3:![0-9]*]], !llvm.loop [[L3:![0-9]*]]
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#line 400
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int x[] = {1, 2};
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for (int y : x)
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if (b)
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++b; // CHECK: add nsw{{.*}}, 1
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else
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++a; // CHECK: add nsw{{.*}}, 1
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// CHECK: br label
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// CHECK: br label {{.*}}, !dbg [[DBG4:![0-9]*]], !llvm.loop [[L4:![0-9]*]]
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// CHECK-DAG: [[DBG1]] = !DILocation(line: 100, scope: !{{.*}})
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// CHECK-DAG: [[DBG2]] = !DILocation(line: 200, scope: !{{.*}})
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// CHECK-DAG: [[DBG3]] = !DILocation(line: 300, scope: !{{.*}})
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// CHECK-DAG: [[DBG4]] = !DILocation(line: 401, scope: !{{.*}})
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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, scope: !{{.*}})
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// CHECK-DAG: [[ELDBG1]] = !DILocation(line: 104, 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, scope: !{{.*}})
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// CHECK-DAG: [[ELDBG2]] = !DILocation(line: 204, scope: !{{.*}})
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// CHECK-DAG: [[L3]] = distinct !{[[L3]], [[SLDBG3:![0-9]*]], [[ELDBG3:![0-9]*]], [[MP]]}
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// CHECK-DAG: [[SLDBG3]] = !DILocation(line: 300, scope: !{{.*}})
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// CHECK-DAG: [[ELDBG3]] = !DILocation(line: 304, scope: !{{.*}})
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// CHECK-DAG: [[L4]] = distinct !{[[L4]], [[SLDBG4:![0-9]*]], [[ELDBG4:![0-9]*]]}
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// CHECK-DAG: [[SLDBG4]] = !DILocation(line: 401, scope: !{{.*}})
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// CHECK-DAG: [[ELDBG4]] = !DILocation(line: 405, scope: !{{.*}})
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}
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