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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
| ; RUN: llc -enable-shrink-wrap=true < %s | FileCheck %s --check-prefix=ASM
; RUN: llc -enable-shrink-wrap=true -filetype=obj < %s | llvm-readobj --codeview | FileCheck %s --check-prefix=OBJ
; C source:
; int doSomething(int*);
; int __fastcall shrink_wrap_basic(int a, int b, int c, int d) {
; if (a < b)
; return a;
; for (int i = c; i < d; ++i)
; doSomething(&c);
; return doSomething(&c);
; }
; ASM: @shrink_wrap_basic@16: # @"\01@shrink_wrap_basic@16"
; ASM: .cv_fpo_proc @shrink_wrap_basic@16 8
; ASM: .cv_loc 0 1 3 9 # t.c:3:9
; ASM: movl %ecx, %eax
; ASM: cmpl %edx, %ecx
; ASM: jl [[EPILOGUE:LBB0_[0-9]+]]
; ASM: pushl %ebx
; ASM: .cv_fpo_pushreg %ebx
; ASM: pushl %edi
; ASM: .cv_fpo_pushreg %edi
; ASM: pushl %esi
; ASM: .cv_fpo_pushreg %esi
; ASM: .cv_fpo_endprologue
; ASM: calll _doSomething
; ASM: popl %esi
; ASM: popl %edi
; ASM: popl %ebx
; ASM: [[EPILOGUE]]: # %return
; ASM: retl $8
; ASM: Ltmp10:
; ASM: .cv_fpo_endproc
; Note how RvaStart advances 7 bytes to skip the shrink-wrapped portion.
; OBJ: SubSectionType: FrameData (0xF5)
; OBJ: FrameData {
; OBJ: RvaStart: 0x0
; OBJ: CodeSize: 0x34
; OBJ: PrologSize: 0x9
; OBJ: FrameFunc [
; OBJ-NEXT: $T0 .raSearch =
; OBJ-NEXT: $eip $T0 ^ =
; OBJ-NEXT: $esp $T0 4 + =
; OBJ-NEXT: ]
; OBJ: }
; OBJ: FrameData {
; OBJ: RvaStart: 0x7
; OBJ: CodeSize: 0x2D
; OBJ: PrologSize: 0x2
; OBJ: FrameFunc [
; OBJ-NEXT: $T0 .raSearch =
; OBJ-NEXT: $eip $T0 ^ =
; OBJ-NEXT: $esp $T0 4 + =
; OBJ-NEXT: $ebx $T0 4 - ^ =
; OBJ-NEXT: ]
; OBJ: }
; OBJ: FrameData {
; OBJ: RvaStart: 0x8
; OBJ: CodeSize: 0x2C
; OBJ: PrologSize: 0x1
; OBJ: FrameFunc [
; OBJ-NEXT: $T0 .raSearch =
; OBJ-NEXT: $eip $T0 ^ =
; OBJ-NEXT: $esp $T0 4 + =
; OBJ-NEXT: $ebx $T0 4 - ^ =
; OBJ-NEXT: $edi $T0 8 - ^ =
; OBJ-NEXT: ]
; OBJ: }
; OBJ: FrameData {
; OBJ: RvaStart: 0x9
; OBJ: CodeSize: 0x2B
; OBJ: PrologSize: 0x0
; OBJ: FrameFunc [
; OBJ-NEXT: $T0 .raSearch =
; OBJ-NEXT: $eip $T0 ^ =
; OBJ-NEXT: $esp $T0 4 + =
; OBJ-NEXT: $ebx $T0 4 - ^ =
; OBJ-NEXT: $edi $T0 8 - ^ =
; OBJ-NEXT: $esi $T0 12 - ^ =
; OBJ-NEXT: ]
; OBJ: }
; OBJ-NOT: FrameData
; ModuleID = 't.c'
source_filename = "t.c"
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i386-pc-windows-msvc19.11.25508"
; Function Attrs: nounwind
define x86_fastcallcc i32 @"\01@shrink_wrap_basic@16"(i32 inreg %a, i32 inreg %b, i32 %c, i32 %d) local_unnamed_addr #0 !dbg !8 {
entry:
%c.addr = alloca i32, align 4
tail call void @llvm.dbg.value(metadata i32 %d, metadata !13, metadata !DIExpression()), !dbg !19
tail call void @llvm.dbg.value(metadata i32 %c, metadata !14, metadata !DIExpression()), !dbg !20
store i32 %c, i32* %c.addr, align 4, !tbaa !21
tail call void @llvm.dbg.value(metadata i32 %b, metadata !15, metadata !DIExpression()), !dbg !25
tail call void @llvm.dbg.value(metadata i32 %a, metadata !16, metadata !DIExpression()), !dbg !26
%cmp = icmp slt i32 %a, %b, !dbg !27
br i1 %cmp, label %return, label %for.cond.preheader, !dbg !29
for.cond.preheader: ; preds = %entry
br label %for.cond, !dbg !30
for.cond: ; preds = %for.cond.preheader, %for.cond
%i.0 = phi i32 [ %inc, %for.cond ], [ %c, %for.cond.preheader ]
call void @llvm.dbg.value(metadata i32 %i.0, metadata !17, metadata !DIExpression()), !dbg !32
%cmp1 = icmp slt i32 %i.0, %d, !dbg !30
call void @llvm.dbg.value(metadata i32* %c.addr, metadata !14, metadata !DIExpression()), !dbg !20
%call = call i32 @doSomething(i32* nonnull %c.addr) #3, !dbg !33
%inc = add nsw i32 %i.0, 1, !dbg !34
call void @llvm.dbg.value(metadata i32 %inc, metadata !17, metadata !DIExpression()), !dbg !32
br i1 %cmp1, label %for.cond, label %return, !dbg !35, !llvm.loop !36
return: ; preds = %for.cond, %entry
%retval.0 = phi i32 [ %a, %entry ], [ %call, %for.cond ]
ret i32 %retval.0, !dbg !38
}
declare i32 @doSomething(i32*) local_unnamed_addr #1
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind readnone speculatable }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "32f118fd5dd7e65ff7733c49b2f804ef")
!2 = !{}
!3 = !{i32 1, !"NumRegisterParameters", i32 0}
!4 = !{i32 2, !"CodeView", i32 1}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = !{i32 1, !"wchar_size", i32 2}
!7 = !{!"clang version 6.0.0 "}
!8 = distinct !DISubprogram(name: "shrink_wrap_basic", linkageName: "\01@shrink_wrap_basic@16", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
!9 = !DISubroutineType(cc: DW_CC_BORLAND_msfastcall, types: !10)
!10 = !{!11, !11, !11, !11, !11}
!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!12 = !{!13, !14, !15, !16, !17}
!13 = !DILocalVariable(name: "d", arg: 4, scope: !8, file: !1, line: 2, type: !11)
!14 = !DILocalVariable(name: "c", arg: 3, scope: !8, file: !1, line: 2, type: !11)
!15 = !DILocalVariable(name: "b", arg: 2, scope: !8, file: !1, line: 2, type: !11)
!16 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 2, type: !11)
!17 = !DILocalVariable(name: "i", scope: !18, file: !1, line: 5, type: !11)
!18 = distinct !DILexicalBlock(scope: !8, file: !1, line: 5, column: 3)
!19 = !DILocation(line: 2, column: 59, scope: !8)
!20 = !DILocation(line: 2, column: 52, scope: !8)
!21 = !{!22, !22, i64 0}
!22 = !{!"int", !23, i64 0}
!23 = !{!"omnipotent char", !24, i64 0}
!24 = !{!"Simple C/C++ TBAA"}
!25 = !DILocation(line: 2, column: 45, scope: !8)
!26 = !DILocation(line: 2, column: 38, scope: !8)
!27 = !DILocation(line: 3, column: 9, scope: !28)
!28 = distinct !DILexicalBlock(scope: !8, file: !1, line: 3, column: 7)
!29 = !DILocation(line: 3, column: 7, scope: !8)
!30 = !DILocation(line: 5, column: 21, scope: !31)
!31 = distinct !DILexicalBlock(scope: !18, file: !1, line: 5, column: 3)
!32 = !DILocation(line: 5, column: 12, scope: !18)
!33 = !DILocation(line: 0, scope: !8)
!34 = !DILocation(line: 5, column: 26, scope: !31)
!35 = !DILocation(line: 5, column: 3, scope: !18)
!36 = distinct !{!36, !35, !37}
!37 = !DILocation(line: 6, column: 19, scope: !18)
!38 = !DILocation(line: 8, column: 1, scope: !8)
|