local-variable-gap.ll
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; RUN: llc -mtriple=x86_64-windows-msvc < %s | FileCheck %s --check-prefix=ASM
; RUN: llc -mtriple=x86_64-windows-msvc < %s -filetype=obj | llvm-readobj --codeview - | FileCheck %s --check-prefix=OBJ
; This test attempts to exercise gaps in local variables. The local variable 'p'
; will end up in some CSR (esi), which will be used in both the BB scheduled
; discontiguously out of line and the normal return BB. The best way to encode
; this is to use a LocalVariableAddrGap. If the gap is too large, multiple
; ranges should be emitted.
; Source to regenerate:
; int barrier();
; int vardef();
; void use(int);
; void __declspec(noreturn) call_noreturn(int);
; int f() {
; if (barrier()) {
; int p = vardef();
; if (barrier()) // Unlikely, will be placed after return
; call_noreturn(p);
; use(p);
; } else {
; barrier();
; }
; return 0;
; }
; ASM: f: # @f
; ASM: pushq %rsi
; ASM: subq $32, %rsp
; ASM: callq barrier
; ASM: testl %eax, %eax
; ASM: je .LBB0_3
; ASM: callq vardef
; ASM: movl %eax, %esi
; ASM: [[p_b1:\.Ltmp[0-9]+]]:
; ASM: #DEBUG_VALUE: p <- $esi
; ASM: callq barrier
; ASM: movl %esi, %ecx
; ASM: testl %eax, %eax
; ASM: jne .LBB0_5
; ASM: # %bb.2: # %if.end
; ASM: #DEBUG_VALUE: p <- $esi
; ASM: callq use
; ASM: jmp .LBB0_4
; ASM: [[p_e1:\.Ltmp[0-9]+]]:
; ASM: .LBB0_3: # %if.else
; ASM: callq barrier
; ASM: .LBB0_4: # %if.end6
; ASM: xorl %eax, %eax
; ASM: addq $32, %rsp
; ASM: popq %rsi
; ASM: retq
; ASM: .LBB0_5: # %if.then4
; ASM: [[p_b2:\.Ltmp[0-9]+]]:
; ASM: #DEBUG_VALUE: p <- $esi
; ASM: callq call_noreturn
; ASM: int3
; ASM: .Lfunc_end0:
; ASM: .short {{.*}} # Record length
; ASM: .short 4414 # Record kind: S_LOCAL
; ASM: .long 116 # TypeIndex
; ASM: .short 0 # Flags
; ASM: .asciz "p"
; ASM: .cv_def_range [[p_b1]] [[p_e1]] [[p_b2]] .Lfunc_end0, reg, 23
; ASM: .short 2 # Record length
; ASM: .short 4431 # Record kind: S_PROC_ID_END
; OBJ: LocalSym {
; OBJ: Type: int (0x74)
; OBJ: VarName: p
; OBJ: }
; OBJ-NOT: LocalSym {
; OBJ: DefRangeRegisterSym {
; OBJ-NEXT: Kind:
; OBJ-NEXT: Register: ESI (0x17)
; OBJ-NEXT: MayHaveNoName: 0
; OBJ-NEXT: LocalVariableAddrRange {
; OBJ-NEXT: OffsetStart: .text+0x{{.*}}
; OBJ-NEXT: ISectStart: 0x0
; OBJ-NEXT: Range: 0x{{.*}}
; OBJ-NEXT: }
; OBJ-NEXT: LocalVariableAddrGap [
; OBJ-NEXT: GapStartOffset: 0x{{.*}}
; OBJ-NEXT: Range: 0x{{.*}}
; OBJ-NEXT: ]
; OBJ-NEXT: }
; ModuleID = 't.cpp'
source_filename = "t.cpp"
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc19.0.24210"
; Function Attrs: nounwind uwtable
define i32 @f() local_unnamed_addr #0 !dbg !7 {
entry:
%call = tail call i32 bitcast (i32 (...)* @barrier to i32 ()*)() #4, !dbg !15
%tobool = icmp eq i32 %call, 0, !dbg !15
br i1 %tobool, label %if.else, label %if.then, !dbg !16
if.then: ; preds = %entry
%call1 = tail call i32 bitcast (i32 (...)* @vardef to i32 ()*)() #4, !dbg !17
tail call void @llvm.dbg.value(metadata i32 %call1, metadata !12, metadata !18), !dbg !19
%call2 = tail call i32 bitcast (i32 (...)* @barrier to i32 ()*)() #4, !dbg !20
%tobool3 = icmp eq i32 %call2, 0, !dbg !20
br i1 %tobool3, label %if.end, label %if.then4, !dbg !22
if.then4: ; preds = %if.then
tail call void @call_noreturn(i32 %call1) #5, !dbg !23
unreachable, !dbg !23
if.end: ; preds = %if.then
tail call void @use(i32 %call1) #4, !dbg !24
br label %if.end6, !dbg !25
if.else: ; preds = %entry
%call5 = tail call i32 bitcast (i32 (...)* @barrier to i32 ()*)() #4, !dbg !26
br label %if.end6
if.end6: ; preds = %if.else, %if.end
ret i32 0, !dbg !28
}
declare i32 @barrier(...) local_unnamed_addr #1
declare i32 @vardef(...) local_unnamed_addr #1
; Function Attrs: noreturn
declare void @call_noreturn(i32) local_unnamed_addr #2
declare void @use(i32) local_unnamed_addr #1
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #3
attributes #0 = { nounwind uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "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"="x86-64" "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" "frame-pointer"="none" "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"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { noreturn "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "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"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { nounwind readnone }
attributes #4 = { nounwind }
attributes #5 = { noreturn nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "t.cpp", directory: "C:\5Csrc\5Cllvm\5Cbuild")
!2 = !{}
!3 = !{i32 2, !"CodeView", i32 1}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"PIC Level", i32 2}
!6 = !{!"clang version 4.0.0 "}
!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 19, type: !8, isLocal: false, isDefinition: true, scopeLine: 19, isOptimized: true, unit: !0, retainedNodes: !11)
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!11 = !{!12}
!12 = !DILocalVariable(name: "p", scope: !13, file: !1, line: 21, type: !10)
!13 = distinct !DILexicalBlock(scope: !14, file: !1, line: 20, column: 18)
!14 = distinct !DILexicalBlock(scope: !7, file: !1, line: 20, column: 7)
!15 = !DILocation(line: 20, column: 7, scope: !14)
!16 = !DILocation(line: 20, column: 7, scope: !7)
!17 = !DILocation(line: 21, column: 13, scope: !13)
!18 = !DIExpression()
!19 = !DILocation(line: 21, column: 9, scope: !13)
!20 = !DILocation(line: 22, column: 9, scope: !21)
!21 = distinct !DILexicalBlock(scope: !13, file: !1, line: 22, column: 9)
!22 = !DILocation(line: 22, column: 9, scope: !13)
!23 = !DILocation(line: 23, column: 7, scope: !21)
!24 = !DILocation(line: 24, column: 5, scope: !13)
!25 = !DILocation(line: 25, column: 3, scope: !13)
!26 = !DILocation(line: 26, column: 5, scope: !27)
!27 = distinct !DILexicalBlock(scope: !14, file: !1, line: 25, column: 10)
!28 = !DILocation(line: 28, column: 3, scope: !7)