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
44define zeroext i1 @_ZN3Foo3batEv(%struct.Foo* %this) #0 align 2 {
45entry:
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 !MDExpression()), !dbg !MDLocation(scope: !MDSubprogram())
48  %cmp.i = icmp eq %struct.Foo* %0, %this
49  ret i1 %cmp.i
50}
51
52; Function Attrs: nounwind uwtable
53define void @_Z3bazv() #1 {
54entry:
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 !MDExpression()), !dbg !MDLocation(scope: !MDSubprogram())
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
61if.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
72declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
73
74attributes #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" }
75attributes #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" }
76attributes #2 = { nounwind readnone }
77
78
79!17 = !MDDerivedType(tag: DW_TAG_reference_type, baseType: null)
80!45 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: null)
81!62 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "arg", line: 4, arg: 2, scope: !MDSubprogram(), type: !17)
82!64 = !{%struct.Flibble* undef}
83!65 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "this", line: 13, arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !MDSubprogram(), type: !45)
84