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Debug Info: Fix the SDLoc propagation for a DAGCombiner rule 

This patch ensures that the rule:
  fold (zext (load x)) -> (zext (truncate (zextload x)))
propagates the SDLoc of the load to the zextload.

<rdar://problem/33755881>

llvm-svn: 315340
This commit is contained in:
Adrian Prantl 2017-10-10 18:08:32 +00:00
parent 6e5f158642
commit 16b8b47152
1 changed files with 37 additions and 0 deletions
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37
llvm/test/CodeGen/X86/load-combine-dbg.ll Normal file
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; RUN: llc -O0 < %s -mtriple=x86_64-unknown | FileCheck %s
; This was extracted from a swift debugger stepping testcase and checks that the
; fold (zext (load x)) -> (zext (truncate (zextload x)))
; rule propagates the SDLoc of the load to the zextload.
; CHECK: .loc {{.*}} main.swift:100
; CHECK-NOT: .loc
; CHECK: .loc {{.*}} main.swift:200
; CHECK-NOT: .loc
; CHECK: .loc {{.*}} main.swift:300
; CHECK-NOT: .loc
declare void @foo(double)
define i32 @zext_load(i32* %arg) !dbg !30 {
%1 = bitcast i32* %arg to i8*
%2 = getelementptr inbounds i8, i8* %1, i32 1
%3 = load i8, i8* %2, align 1, !dbg !100
%4 = uitofp i8 %3 to double, !dbg !200
call void @foo(double %4), !dbg !200
%5 = zext i8 %3 to i32, !dbg !300
ret i32 %5
}
!llvm.dbg.cu = !{!1}
!llvm.module.flags = !{!0}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = distinct !DICompileUnit(language: DW_LANG_Swift, file: !3, isOptimized: false, emissionKind: FullDebug)
!2 = !DIModule(scope: null, name: "test", includePath: "", isysroot: "/")
!3 = !DIFile(filename: "main.swift", directory: "/")
!30 = distinct !DISubprogram(name: "main", scope: !2, file: !3, line: 1, type: !31, isLocal: false, isDefinition: true, isOptimized: false, unit: !1)
!31 = !DISubroutineType(types: !32)
!32 = !{}
!100 = !DILocation(line: 100, scope: !30)
!200 = !DILocation(line: 200, scope: !30)
!300 = !DILocation(line: 300, scope: !30)