1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
; RUN: llc < %s -march=x86-64 -mtriple=x86_64-linux | FileCheck %s
; The Peephole optimizer should fold the load into the cmp even with debug info.
; CHECK-LABEL: _ZN3Foo3batEv
; CHECK-NOT: movq pfoo
; CHECK: cmpq {{%[a-z]+}}, pfoo(%rip)
;
; CHECK-LABEL: _Z3bazv
; CHECK-NOT: movq wibble2
; CHECK: cmpq {{%[a-z]+}}, wibble2(%rip)
; Regenerate test with this command:
; clang -emit-llvm -S -O2 -g
; from this source:
; struct Foo {
; bool bat();
; bool operator==(Foo &arg) { return (this == &arg); }
; };
; Foo *pfoo;
; bool Foo::bat() { return (*this == *pfoo); }
;
; struct Wibble {
; int x;
; } *wibble1, *wibble2;
; struct Flibble {
; void bar(Wibble *c) {
; if (c < wibble2)
; wibble2 = 0;
; c->x = 0;
; }
; } flibble;
; void baz() { flibble.bar(wibble1); }
%struct.Foo = type { i8 }
%struct.Wibble = type { i32 }
%struct.Flibble = type { i8 }
@pfoo = global %struct.Foo* null, align 8
@wibble1 = global %struct.Wibble* null, align 8
@wibble2 = global %struct.Wibble* null, align 8
@flibble = global %struct.Flibble zeroinitializer, align 1
; Function Attrs: nounwind readonly uwtable
define zeroext i1 @_ZN3Foo3batEv(%struct.Foo* %this) #0 align 2 {
entry:
%0 = load %struct.Foo*, %struct.Foo** @pfoo, align 8
tail call void @llvm.dbg.value(metadata %struct.Foo* %0, i64 0, metadata !62, metadata !MDExpression()), !dbg !MDLocation(scope: !MDSubprogram())
%cmp.i = icmp eq %struct.Foo* %0, %this
ret i1 %cmp.i
}
; Function Attrs: nounwind uwtable
define void @_Z3bazv() #1 {
entry:
%0 = load %struct.Wibble*, %struct.Wibble** @wibble1, align 8
tail call void @llvm.dbg.value(metadata %struct.Flibble* undef, i64 0, metadata !65, metadata !MDExpression()), !dbg !MDLocation(scope: !MDSubprogram())
%1 = load %struct.Wibble*, %struct.Wibble** @wibble2, align 8
%cmp.i = icmp ugt %struct.Wibble* %1, %0
br i1 %cmp.i, label %if.then.i, label %_ZN7Flibble3barEP6Wibble.exit
if.then.i: ; preds = %entry
store %struct.Wibble* null, %struct.Wibble** @wibble2, align 8
br label %_ZN7Flibble3barEP6Wibble.exit
_ZN7Flibble3barEP6Wibble.exit: ; preds = %entry, %if.then.i
%x.i = getelementptr inbounds %struct.Wibble, %struct.Wibble* %0, i64 0, i32 0
store i32 0, i32* %x.i, align 4
ret void
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
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" }
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" }
attributes #2 = { nounwind readnone }
!17 = !MDDerivedType(tag: DW_TAG_reference_type, baseType: null)
!45 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: null)
!62 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "arg", line: 4, arg: 2, scope: !MDSubprogram(), type: !17)
!64 = !{%struct.Flibble* undef}
!65 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "this", line: 13, arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !MDSubprogram(), type: !45)
|
