1 ; RUN: llc < %s | FileCheck %s --check-prefix=ASM
2 ; RUN: llc -filetype=obj < %s | llvm-readobj --codeview | FileCheck %s --check-prefix=OBJ
6 ; When stack realignment is required by dynamic allocas are not used, the
7 ; compiler will address locals with the ESP register. However, if call argument
8 ; set up uses PUSH instructions, ESP may vary over the course of the function.
9 ; This means it's not useful as a base register for describing the locations of
10 ; variables. Instead, our CodeView output prefers to use the VFRAME virtual
11 ; register, which is defined in the FPO data as $T0. Make sure we define it.
13 ; Original C++ test case, which uses __thiscall to encourage PUSH conversion:
16 ; int __declspec(noinline) foo();
17 ; void __declspec(noinline) bar(int *a, int *b, double *c);
22 ; double __declspec(align(8)) force_alignment = 0.42;
23 ; bar(&a, &b, &force_alignment);
24 ; x += (int)force_alignment;
27 ; void Foo::bar(int *a, int *b, double *c) {
35 ; This stops the debugger in bar, and locals in Foo::foo would be corrupt.
37 ; More reduced C code to generate this IR:
39 ; void usevals(int *, int *, double *);
40 ; int realign_with_csrs(int x) {
42 ; double __declspec(align(8)) force_alignment = 0.42;
43 ; usevals(&a, &x, &force_alignment);
47 ; Match the prologue for the .cv_fpo* directives.
48 ; ASM-LABEL: _realign_with_csrs:
49 ; ASM: .cv_fpo_proc _realign_with_csrs 4
50 ; ASM: # %bb.0: # %entry
52 ; ASM: .cv_fpo_pushreg %ebp
53 ; ASM: movl %esp, %ebp
54 ; ASM: .cv_fpo_setframe %ebp
56 ; ASM: .cv_fpo_stackalign 8
58 ; ASM: .cv_fpo_stackalloc 16
59 ; ASM: .cv_fpo_endprologue
61 ; 'x' should be EBP-relative, 'a' and 'force_alignment' ESP relative.
63 ; ASM-DAG: leal 8(%esp), %[[LEA_DBL:[^ ]*]]
64 ; ASM-DAG: leal 8(%ebp), %[[LEA_X:[^ ]*]]
65 ; ASM-DAG: leal 4(%esp), %[[LEA_A:[^ ]*]]
66 ; ASM: pushl %[[LEA_DBL]]
67 ; ASM: pushl %[[LEA_X]]
68 ; ASM: pushl %[[LEA_A]]
73 ; OBJ: SubSectionType: Symbols (0xF1)
76 ; OBJ: SubSectionType: FrameData (0xF5)
77 ; Really, the only important FrameFunc is the last one.
86 ; OBJ-NEXT: $T1 $ebp 4 + =
87 ; OBJ-NEXT: $T0 $T1 4 - 8 @ =
88 ; OBJ-NEXT: $eip $T1 ^ =
89 ; OBJ-NEXT: $esp $T1 4 + =
90 ; OBJ-NEXT: $ebp $T1 4 - ^ =
95 ; OBJ: SubSectionType: Symbols (0xF1)
96 ; OBJ: GlobalProcIdSym {
97 ; OBJ: Kind: S_GPROC32_ID (0x1147)
98 ; OBJ: DisplayName: realign_with_csrs
99 ; OBJ: LinkageName: _realign_with_csrs
101 ; The frame register for locals should be VFRAME, and EBP for parameters.
102 ; OBJ: FrameProcSym {
103 ; OBJ: Kind: S_FRAMEPROC (0x1012)
104 ; OBJ: TotalFrameBytes: 0x14
105 ; OBJ: LocalFramePtrReg: VFRAME (0x7536)
106 ; OBJ: ParamFramePtrReg: EBP (0x16)
108 ; As seen in ASM, offset of x is 8.
110 ; OBJ: Kind: S_LOCAL (0x113E)
111 ; OBJ: Type: int (0x74)
113 ; OBJ: IsParameter (0x1)
117 ; OBJ: DefRangeFramePointerRelSym {
118 ; OBJ: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142)
121 ; ESP is VFRAME - 16, ESP offset of 'a' is 4, so -12.
123 ; OBJ: Kind: S_LOCAL (0x113E)
124 ; OBJ: Type: int (0x74)
129 ; OBJ: DefRangeFramePointerRelSym {
130 ; OBJ: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142)
133 ; ESP is VFRAME - 16, ESP offset of 'force_alignment' is 8, so -8.
135 ; OBJ: Kind: S_LOCAL (0x113E)
136 ; OBJ: Type: double (0x41)
139 ; OBJ: VarName: force_alignment
141 ; OBJ: DefRangeFramePointerRelSym {
142 ; OBJ: Kind: S_DEFRANGE_FRAMEPOINTER_REL (0x1142)
146 ; OBJ: Kind: S_PROC_ID_END (0x114F)
151 source_filename = "t.c"
152 target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
153 target triple = "i386-pc-windows-msvc19.14.26433"
155 ; Function Attrs: nounwind
156 define dso_local i32 @realign_with_csrs(i32 %x) local_unnamed_addr #0 !dbg !8 {
158 %x.addr = alloca i32, align 4
159 %a = alloca i32, align 4
160 %force_alignment = alloca double, align 8
161 store i32 %x, i32* %x.addr, align 4, !tbaa !17
162 call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !21
163 %0 = bitcast i32* %a to i8*, !dbg !22
164 call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %0) #4, !dbg !22
165 call void @llvm.dbg.declare(metadata i32* %a, metadata !14, metadata !DIExpression()), !dbg !22
166 %call = tail call i32 @getval() #4, !dbg !22
167 store i32 %call, i32* %a, align 4, !dbg !22, !tbaa !17
168 %1 = bitcast double* %force_alignment to i8*, !dbg !23
169 call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %1) #4, !dbg !23
170 call void @llvm.dbg.declare(metadata double* %force_alignment, metadata !15, metadata !DIExpression()), !dbg !23
171 store double 4.200000e-01, double* %force_alignment, align 8, !dbg !23, !tbaa !24
172 call void @usevals(i32* nonnull %a, i32* nonnull %x.addr, double* nonnull %force_alignment) #4, !dbg !26
173 %2 = load i32, i32* %x.addr, align 4, !dbg !27, !tbaa !17
174 call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %1) #4, !dbg !28
175 call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %0) #4, !dbg !28
179 ; Function Attrs: nounwind readnone speculatable
180 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
182 ; Function Attrs: argmemonly nounwind
183 declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #2
185 declare dso_local i32 @getval() local_unnamed_addr #3
187 declare dso_local void @usevals(i32*, i32*, double*) local_unnamed_addr #3
189 ; Function Attrs: argmemonly nounwind
190 declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #2
192 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" }
193 attributes #1 = { nounwind readnone speculatable }
194 attributes #2 = { argmemonly nounwind }
195 attributes #3 = { "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" }
196 attributes #4 = { nounwind }
199 !llvm.module.flags = !{!3, !4, !5, !6}
202 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
203 !1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "a646950309d5d01d8087fc10fea33941")
205 !3 = !{i32 1, !"NumRegisterParameters", i32 0}
206 !4 = !{i32 2, !"CodeView", i32 1}
207 !5 = !{i32 2, !"Debug Info Version", i32 3}
208 !6 = !{i32 1, !"wchar_size", i32 2}
209 !7 = !{!"clang version 8.0.0 "}
210 !8 = distinct !DISubprogram(name: "realign_with_csrs", scope: !1, file: !1, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
211 !9 = !DISubroutineType(types: !10)
213 !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
214 !12 = !{!13, !14, !15}
215 !13 = !DILocalVariable(name: "x", arg: 1, scope: !8, file: !1, line: 3, type: !11)
216 !14 = !DILocalVariable(name: "a", scope: !8, file: !1, line: 4, type: !11)
217 !15 = !DILocalVariable(name: "force_alignment", scope: !8, file: !1, line: 5, type: !16, align: 64)
218 !16 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
219 !17 = !{!18, !18, i64 0}
220 !18 = !{!"int", !19, i64 0}
221 !19 = !{!"omnipotent char", !20, i64 0}
222 !20 = !{!"Simple C/C++ TBAA"}
223 !21 = !DILocation(line: 3, scope: !8)
224 !22 = !DILocation(line: 4, scope: !8)
225 !23 = !DILocation(line: 5, scope: !8)
226 !24 = !{!25, !25, i64 0}
227 !25 = !{!"double", !19, i64 0}
228 !26 = !DILocation(line: 6, scope: !8)
229 !27 = !DILocation(line: 7, scope: !8)
230 !28 = !DILocation(line: 8, scope: !8)