d2d9dc8eb4
Debugify is extremely useful as a testing and debugging tool, and a good number of LLVM-IR transform tests use it. We need it to support "new" non-instruction debug-info to get test coverage, but it's not important enough to completely convert right now (and it'd be a large undertaking). Thus: convert to/from dbg.value/DPValue mode on entry and exit of the pass, which gives us the functionality without any further work. The cost is compile-time, but again this is only happening during tests. Tested by: the large set of debugify tests enabled here. Note the InstCombine test (cast-mul-select.ll) that hasn't been fully enabled: this is because there's a debug-info sinking piece of code there that hasn't been instrumented.
29 lines
1.0 KiB
LLVM
29 lines
1.0 KiB
LLVM
; RUN: opt < %s -passes=debugify,dse -S | FileCheck %s
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; RUN: opt < %s -passes=debugify,dse -S --try-experimental-debuginfo-iterators | FileCheck %s
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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declare noalias ptr @malloc(i32)
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declare void @test_f()
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define ptr @test_salvage(i32 %arg) {
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; Check that all four original local variables have their values preserved.
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; CHECK-LABEL: @test_salvage(
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; CHECK-NEXT: malloc
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; CHECK-NEXT: @llvm.dbg.value(metadata ptr %p, metadata ![[p:.*]], metadata !DIExpression())
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; CHECK-NEXT: @llvm.dbg.value(metadata i32 %arg, metadata ![[DEAD:.*]], metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value))
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; CHECK-NEXT: call void @test_f()
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; CHECK-NEXT: store i32 0, ptr %p
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%p = tail call ptr @malloc(i32 4)
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%DEAD = add i32 %arg, 1
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store i32 %DEAD, ptr %p
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call void @test_f()
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store i32 0, ptr %p
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ret ptr %p
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}
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; CHECK: ![[p]] = !DILocalVariable(name: "1"
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; CHECK: ![[DEAD]] = !DILocalVariable(name: "2"
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