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This patch is part of a stack that teaches Clang to generate Key Instructions metadata for C and C++. The Key Instructions project is introduced, including a "quick summary" section at the top which adds context for this PR, here: https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668 The feature is only functional in LLVM if LLVM is built with CMake flag LLVM_EXPERIMENTAL_KEY_INSTRUCTIONs. Eventually that flag will be removed. The Clang-side work is demoed here: https://github.com/llvm/llvm-project/pull/130943
38 lines
1.6 KiB
C
38 lines
1.6 KiB
C
// RUN: %clang -gkey-instructions -x c++ %s -gmlt -S -emit-llvm -o - \
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// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank
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// RUN: %clang -gkey-instructions -x c %s -gmlt -S -emit-llvm -o - \
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// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank
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// Perennial quesiton: should the inc be its own source atom or not
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// (currently it is).
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// FIXME: See do.c and while.c regarding cmp and cond br groups.
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void a(int A) {
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// CHECK: entry:
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// CHECK: store i32 0, ptr %i{{.*}}, !dbg [[G1R1:!.*]]
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// CHECK: for.cond:
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// CHECK: %cmp = icmp slt i32 %0, %1, !dbg [[G2R1:!.*]]
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// CHECK: br i1 %cmp, label %for.body, label %for.end, !dbg [[G3R1:!.*]]
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// FIXME: Added uncond br group here which is useful for O0, which we're
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// no longer targeting. With optimisations loop rotate puts the condition
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// into for.inc and simplifycfg smooshes that and for.body together, so
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// it's not clear whether it adds any value.
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// CHECK: for.body:
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// CHECK: br label %for.inc, !dbg [[G5R1:!.*]]
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// CHECK: for.inc:
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// CHECK: %inc = add{{.*}}, !dbg [[G4R2:!.*]]
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// CHECK: store i32 %inc, ptr %i{{.*}}, !dbg [[G4R1:!.*]]
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for (int i = 0; i < A; ++i) { }
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}
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// CHECK: [[G1R1]] = !DILocation({{.*}}, atomGroup: 1, atomRank: 1)
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// CHECK: [[G2R1]] = !DILocation({{.*}}, atomGroup: 2, atomRank: 1)
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// CHECK: [[G3R1]] = !DILocation({{.*}}, atomGroup: 3, atomRank: 1)
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// CHECK: [[G5R1]] = !DILocation({{.*}}, atomGroup: 5, atomRank: 1)
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// CHECK: [[G4R2]] = !DILocation({{.*}}, atomGroup: 4, atomRank: 2)
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// CHECK: [[G4R1]] = !DILocation({{.*}}, atomGroup: 4, atomRank: 1)
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