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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
# RUN: llc %s --start-before=branch-folder --stop-after=branch-folder -o - \
# RUN: | FileCheck %s --implicit-check-not=DBG_PHI
## Check that common instructions hoisted from `if.then` and `if.else` into
## common pred `entry` get merged debug locations. The debug instructions from
## both branches should get hoisted and killed.
##
## The MIR debug instructions have been modified by hand in order to check they
## can be killed.
##
## Check DBG_PHIs are deleted rather than hoisted (implicit-check-not).
##
## Check DBG_LABELs are hoisted and not modified (and don't cause a crash).
# CHECK: bb.0
# CHECK: CALL64pcrel32 @f, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $rax
## --- Start splice from bb.2.if.else (and debug instructions from bb.1.if.then) ---
# CHECK-NEXT: DBG_LABEL 0
# CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[#]], !DIExpression(), debug-location ![[#]]
# CHECK-NEXT: DBG_LABEL 1
# CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[#]], !DIExpression(), debug-location ![[#]]
# CHECK-NEXT: $edi = MOV32r0 implicit-def dead $eflags, debug-instr-number 2, debug-location !DILocation(line: 0, scope: ![[#]])
# CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[#]], !DIExpression(DW_OP_LLVM_arg, 0), debug-location ![[#]]
# CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[#]], !DIExpression(DW_OP_LLVM_arg, 0), debug-location ![[#]]
## --- End splice ------------------------------------------------------------------
# CHECK-NEXT: TEST64rr killed renamable $rax, renamable $rax, implicit-def $eflags
# CHECK-NEXT: JCC_1 %bb.2, 9, implicit killed $eflags
# CHECK: bb.1
--- |
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare dso_local noundef i64 @f() local_unnamed_addr
define dso_local noundef i32 @g() local_unnamed_addr !dbg !7 {
%call = tail call noundef i64 @f()
%cmp1 = icmp sgt i64 0, %call
%conv2 = trunc i64 0 to i32
br i1 %cmp1, label %if.then, label %if.else
if.then: ; preds = %0
#dbg_value(i64 0, !11, !DIExpression(), !13)
tail call void @_Z3fooii(i32 noundef %conv2, i32 noundef 0), !dbg !14
#dbg_value(i64 1, !11, !DIExpression(), !13)
br label %if.end, !dbg !15
if.else: ; preds = %0
#dbg_value(i64 2, !11, !DIExpression(), !13)
tail call void @_Z3barii(i32 noundef %conv2, i32 noundef 1), !dbg !16
#dbg_value(i64 3, !11, !DIExpression(), !13)
br label %if.end, !dbg !17
if.end: ; preds = %if.else, %if.then
ret i32 2
}
declare void @_Z3fooii(i32 noundef, i32 noundef) local_unnamed_addr
declare void @_Z3barii(i32 noundef, i32 noundef) local_unnamed_addr
!llvm.module.flags = !{!0, !1}
!llvm.ident = !{!2}
!llvm.dbg.cu = !{!3}
!llvm.debugify = !{!5, !6}
!0 = !{i32 7, !"Dwarf Version", i32 5}
!1 = !{i32 2, !"Debug Info Version", i32 3}
!2 = !{!"clang version 21.0.0"}
!3 = distinct !DICompileUnit(language: DW_LANG_C, file: !4, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
!4 = !DIFile(filename: "test.nodbg.ll", directory: "/")
!5 = !{i32 15}
!6 = !{i32 7}
!7 = distinct !DISubprogram(name: "g", linkageName: "g", scope: null, file: !4, line: 1, type: !8, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !3, retainedNodes: !10)
!8 = !DISubroutineType(types: !9)
!9 = !{}
!10 = !{!11}
!11 = !DILocalVariable(name: "1", scope: !7, file: !4, line: 3, type: !12)
!12 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_unsigned)
!13 = !DILocation(line: 3, column: 1, scope: !7)
!14 = !DILocation(line: 9, column: 1, scope: !7)
!15 = !DILocation(line: 10, column: 1, scope: !7)
!16 = !DILocation(line: 11, column: 1, scope: !7)
!17 = !DILocation(line: 12, column: 1, scope: !7)
...
---
name: g
tracksRegLiveness: true
isSSA: false
body: |
bb.0 (%ir-block.0):
successors: %bb.1(0x40000000), %bb.2(0x40000000)
frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 16
CALL64pcrel32 @f, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $rax
TEST64rr killed renamable $rax, renamable $rax, implicit-def $eflags
JCC_1 %bb.2, 9, implicit killed $eflags
JMP_1 %bb.1
bb.1.if.then:
successors: %bb.3(0x80000000)
DBG_PHI $esp, 3
DBG_LABEL 0
DBG_VALUE $esi, $noreg, !11, !DIExpression(), debug-location !13
$edi = MOV32r0 implicit-def dead $eflags, debug-instr-number 1, debug-location !14
DBG_INSTR_REF !11, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13
$esi = MOV32r0 implicit-def dead $eflags, debug-location !14
CALL64pcrel32 target-flags(x86-plt) @_Z3fooii, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit killed $esi, implicit-def $rsp, implicit-def $ssp, debug-location !14
JMP_1 %bb.3, debug-location !15
bb.2.if.else:
successors: %bb.3(0x80000000)
DBG_PHI $esp, 4
DBG_LABEL 1
DBG_VALUE $esp, $noreg, !11, !DIExpression(), debug-location !13
$edi = MOV32r0 implicit-def dead $eflags, debug-instr-number 2, debug-location !16
DBG_INSTR_REF !11, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13
$esi = MOV32ri 1, debug-location !16
CALL64pcrel32 target-flags(x86-plt) @_Z3barii, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit killed $esi, implicit-def $rsp, implicit-def $ssp, debug-location !16
bb.3.if.end:
$eax = MOV32ri 2
$rcx = frame-destroy POP64r implicit-def $rsp, implicit $rsp
frame-destroy CFI_INSTRUCTION def_cfa_offset 8
RET 0, $eax
...
|
