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| # RUN: llc %s -o - -run-pass=livedebugvalues -mtriple=x86_64-unknown-unknown | FileCheck %s
#
# In this lightly modified test case, the transfer in the entry block from
# geti32's return value in $eax to the non-volatile $ebx should be recognized,
# and propagated throughout the whole function.
#
# CHECK-LABEL: bb.0.entry
# CHECK: DBG_VALUE $eax
# CHECK: DBG_VALUE $ebx
# CHECK-LABEL: bb.1.loop2
# CHECK: DBG_VALUE $ebx
# CHECK-LABEL: bb.2.loop
# CHECK: DBG_VALUE $ebx
# CHECK-LABEL: bb.3.exit
# CHECK: DBG_VALUE $ebx
--- |
; ModuleID = 'asdf'
source_filename = "asdf.ll"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-unknown"
@glob = global i32 0
declare i1 @booler()
declare i32 @geti32()
declare void @escape(i32)
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)
define i32 @foo() !dbg !4 {
entry:
%bar = call i32 @geti32(), !dbg !10
call void @llvm.dbg.value(metadata i32 %bar, metadata !9, metadata !DIExpression()), !dbg !10
br label %loop
loop: ; preds = %loop2, %entry
call void @escape(i32 %bar)
%retval = call i1 @booler(), !dbg !10
br i1 %retval, label %loop2, label %exit
loop2: ; preds = %loop
store i32 %bar, i32* @glob
br label %loop
exit: ; preds = %loop
ret i32 %bar
}
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**)
!llvm.module.flags = !{!0, !1}
!llvm.dbg.cu = !{!2}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = !{i32 2, !"Dwarf Version", i32 4}
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "beards", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
!3 = !DIFile(filename: "bees.cpp", directory: ".")
!4 = distinct !DISubprogram(name: "nope", scope: !3, file: !3, line: 1, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !8)
!5 = !DISubroutineType(types: !6)
!6 = !{!7}
!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!8 = !{!9}
!9 = !DILocalVariable(name: "toast", scope: !4, file: !3, line: 1, type: !7)
!10 = !DILocation(line: 1, scope: !4)
...
---
name: foo
tracksRegLiveness: true
frameInfo:
stackSize: 8
offsetAdjustment: -8
adjustsStack: true
hasCalls: true
cvBytesOfCalleeSavedRegisters: 8
fixedStack:
- { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
stack: []
body: |
bb.0.entry:
successors: %bb.1(0x80000000)
liveins: $rbx
frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp, debug-location !10
CFI_INSTRUCTION def_cfa_offset 16
CFI_INSTRUCTION offset $rbx, -16
CALL64pcrel32 @geti32, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !10
DBG_VALUE $eax, $noreg, !9, !DIExpression(), debug-location !10
$ebx = MOV32rr killed $eax, debug-location !10
JMP_1 %bb.1
bb.1.loop2:
successors: %bb.2
liveins: $ebx
MOV32mr $rip, 1, $noreg, @glob, $noreg, renamable $ebx :: (store 4 into @glob)
bb.2.loop:
successors: %bb.1, %bb.3
liveins: $ebx
$edi = MOV32rr $ebx
CALL64pcrel32 @escape, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit-def $rsp, implicit-def $ssp
CALL64pcrel32 @booler, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $al, debug-location !10
TEST8ri killed renamable $al, 1, implicit-def $eflags
JCC_1 %bb.1, 5, implicit $eflags
bb.3.exit:
liveins: $ebx
$eax = MOV32rr killed $ebx
$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp
CFI_INSTRUCTION def_cfa_offset 8
RETQ $eax
...
|