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bfa27d73dd
Summary: Fix a case where FoldBranchToCommonDest() would bail out from doing CSE when encountering a debug intrinsic. Handle that by skipping past the debug intrinsics. Also, as a minor refactoring, rename checkCSEInPredecessor() to tryCSEWithPredecessor() to make it a bit more clear that the function may remove instructions. Reviewers: fhahn, craig.topper, dblaikie, xbolva00 Reviewed By: fhahn, xbolva00 Subscribers: vsk, davide, llvm-commits Differential Revision: https://reviews.llvm.org/D46635 llvm-svn: 332698
50 lines
1.8 KiB
LLVM
50 lines
1.8 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; RUN: opt < %s -strip-debug -simplifycfg -S | FileCheck %s
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; Verify that the and.2 instruction is eliminated even in the presence of a
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; preceding debug intrinsic.
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; CHECK-LABEL: bb1:
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; CHECK: and i1 false, false
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; CHECK-LABEL: bb2:
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; CHECK-NOT: and i1 false, false
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: norecurse nounwind
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define void @foo() local_unnamed_addr #0 !dbg !4 {
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bb1:
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%and.1 = and i1 false, false
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%cmp = icmp eq i16 0, 0
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br i1 %cmp, label %bb2, label %bb3
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bb2: ; preds = %bb1
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call void @llvm.dbg.value(metadata i16 0, metadata !8, metadata !DIExpression()), !dbg !9
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%and.2 = and i1 false, false
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br label %bb3
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bb3: ; preds = %bb2, %bb1
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ret void
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { norecurse nounwind }
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attributes #1 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3}
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!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "Foo", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2)
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!1 = !DIFile(filename: "foo.c", directory: "/")
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!2 = !{}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 10, type: !5, isLocal: false, isDefinition: true, scopeLine: 10, isOptimized: false, unit: !0, retainedNodes: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null, !7}
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!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!8 = !DILocalVariable(name: "p_1", arg: 1, scope: !4, line: 4, type: !7)
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!9 = distinct !DILocation(line: 11, column: 3, scope: !4)
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