1 ; RUN: llc < %s -march=x86-64 -mtriple=x86_64-linux | FileCheck %s 2 3 ; The Peephole optimizer should fold the load into the cmp even with debug info. 4 ; CHECK-LABEL: _ZN3Foo3batEv 5 ; CHECK-NOT: movq pfoo 6 ; CHECK: cmpq {{%[a-z]+}}, pfoo(%rip) 7 ; 8 ; CHECK-LABEL: _Z3bazv 9 ; CHECK-NOT: movq wibble2 10 ; CHECK: cmpq {{%[a-z]+}}, wibble2(%rip) 11 12 ; Regenerate test with this command: 13 ; clang -emit-llvm -S -O2 -g 14 ; from this source: 15 ; struct Foo { 16 ; bool bat(); 17 ; bool operator==(Foo &arg) { return (this == &arg); } 18 ; }; 19 ; Foo *pfoo; 20 ; bool Foo::bat() { return (*this == *pfoo); } 21 ; 22 ; struct Wibble { 23 ; int x; 24 ; } *wibble1, *wibble2; 25 ; struct Flibble { 26 ; void bar(Wibble *c) { 27 ; if (c < wibble2) 28 ; wibble2 = 0; 29 ; c->x = 0; 30 ; } 31 ; } flibble; 32 ; void baz() { flibble.bar(wibble1); } 33 34 %struct.Foo = type { i8 } 35 %struct.Wibble = type { i32 } 36 %struct.Flibble = type { i8 } 37 38 @pfoo = global %struct.Foo* null, align 8 39 @wibble1 = global %struct.Wibble* null, align 8 40 @wibble2 = global %struct.Wibble* null, align 8 41 @flibble = global %struct.Flibble zeroinitializer, align 1 42 43 ; Function Attrs: nounwind readonly uwtable 44 define zeroext i1 @_ZN3Foo3batEv(%struct.Foo* %this) #0 align 2 { 45 entry: 46 %0 = load %struct.Foo*, %struct.Foo** @pfoo, align 8 47 tail call void @llvm.dbg.value(metadata %struct.Foo* %0, i64 0, metadata !62, metadata !DIExpression()), !dbg !DILocation(scope: !1) 48 %cmp.i = icmp eq %struct.Foo* %0, %this 49 ret i1 %cmp.i 50 } 51 52 ; Function Attrs: nounwind uwtable 53 define void @_Z3bazv() #1 { 54 entry: 55 %0 = load %struct.Wibble*, %struct.Wibble** @wibble1, align 8 56 tail call void @llvm.dbg.value(metadata %struct.Flibble* undef, i64 0, metadata !65, metadata !DIExpression()), !dbg !DILocation(scope: !1) 57 %1 = load %struct.Wibble*, %struct.Wibble** @wibble2, align 8 58 %cmp.i = icmp ugt %struct.Wibble* %1, %0 59 br i1 %cmp.i, label %if.then.i, label %_ZN7Flibble3barEP6Wibble.exit 60 61 if.then.i: ; preds = %entry 62 store %struct.Wibble* null, %struct.Wibble** @wibble2, align 8 63 br label %_ZN7Flibble3barEP6Wibble.exit 64 65 _ZN7Flibble3barEP6Wibble.exit: ; preds = %entry, %if.then.i 66 %x.i = getelementptr inbounds %struct.Wibble, %struct.Wibble* %0, i64 0, i32 0 67 store i32 0, i32* %x.i, align 4 68 ret void 69 } 70 71 ; Function Attrs: nounwind readnone 72 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2 73 74 attributes #0 = { nounwind readonly uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" } 75 attributes #1 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" } 76 attributes #2 = { nounwind readnone } 77 78 !1 = distinct !DISubprogram() 79 80 !17 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: null) 81 !45 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: null) 82 !62 = !DILocalVariable(name: "arg", line: 4, arg: 2, scope: !1, type: !17) 83 !64 = !{%struct.Flibble* undef} 84 !65 = !DILocalVariable(name: "this", line: 13, arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !1, type: !45) 85
