1; RUN: llc < %s -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 ptr wibble1, *wibble2; 23; struct Flibble { 24; void bar(Wibble *c) { 25; if (c < wibble2) 26; wibble2 = 0; 27; c->x = 0; 28; } 29; } flibble; 30; void baz() { flibble.bar(wibble1); } 31 32%struct.Foo = type { i8 } 33%struct.Wibble = type { i32 } 34%struct.Flibble = type { i8 } 35 36@pfoo = dso_local global ptr null, align 8 37@wibble1 = dso_local global ptr null, align 8 38@wibble2 = dso_local global ptr null, align 8 39@flibble = dso_local global %struct.Flibble zeroinitializer, align 1 40 41; Function Attrs: nounwind readonly uwtable 42define zeroext i1 @_ZN3Foo3batEv(ptr %this) #0 align 2 { 43entry: 44 %0 = load ptr, ptr @pfoo, align 8 45 tail call void @llvm.dbg.value(metadata ptr %0, i64 0, metadata !62, metadata !DIExpression()), !dbg !DILocation(scope: !1) 46 %cmp.i = icmp eq ptr %0, %this 47 ret i1 %cmp.i 48} 49 50; Function Attrs: nounwind uwtable 51define dso_local void @_Z3bazv() #1 { 52entry: 53 %0 = load ptr, ptr @wibble1, align 8 54 tail call void @llvm.dbg.value(metadata ptr undef, i64 0, metadata !65, metadata !DIExpression()), !dbg !DILocation(scope: !1) 55 %1 = load ptr, ptr @wibble2, align 8 56 %cmp.i = icmp ugt ptr %1, %0 57 br i1 %cmp.i, label %if.then.i, label %_ZN7Flibble3barEP6Wibble.exit 58 59if.then.i: ; preds = %entry 60 store ptr null, ptr @wibble2, align 8 61 br label %_ZN7Flibble3barEP6Wibble.exit 62 63_ZN7Flibble3barEP6Wibble.exit: ; preds = %entry, %if.then.i 64 store i32 0, ptr %0, align 4 65 ret void 66} 67 68; Function Attrs: nounwind readnone 69declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2 70 71attributes #0 = { nounwind readonly uwtable "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" } 72attributes #1 = { nounwind uwtable "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" } 73attributes #2 = { nounwind readnone } 74 75!1 = distinct !DISubprogram() 76 77!17 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: null) 78!45 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: null) 79!62 = !DILocalVariable(name: "arg", line: 4, arg: 2, scope: !1, type: !17) 80!64 = !{ptr undef} 81!65 = !DILocalVariable(name: "this", line: 13, arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !1, type: !45) 82