coalesce-dbg-value-subreg-rewrite.mir
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# RUN: llc -O0 -mtriple x86_64-pc-linux-gnu -run-pass simple-register-coalescing -verify-coalescing -o - %s | FileCheck %s
--- |
define i16 @main() {
entry:
call void @llvm.dbg.value(metadata i8 0, metadata !11, metadata !DIExpression()), !dbg !13
ret i16 0
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "tmp.c", directory: "")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 1}
!6 = !{!"clang"}
!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 4, type: !8, isLocal: false, isDefinition: true, scopeLine: 4, isOptimized: false, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
!11 = !DILocalVariable(name: "c", scope: !7, file: !1, line: 5, type: !12)
!12 = !DIBasicType(name: "mytype", size: 16)
!13 = !DILocation(line: 5, column: 11, scope: !7)
...
---
name: main
tracksRegLiveness: true
body: |
bb.0.entry:
%0:gr16_abcd = MOV16ri 0
DBG_VALUE %0.sub_8bit:gr16_abcd, $noreg, !11, !DIExpression(), debug-location !13
undef %6.sub_8bit:gr16_abcd = COPY killed %0.sub_8bit
dead $dx = COPY killed %6
...
# Verify that we get $dl in the DBG_VALUE (and not $dx.sub_8bit as we used to
# do before the bugfix, which resulted in "Bad machine code: Illegal
# subregister index for physical register").
#
# CHECK: bb.0.entry:
# CHECK-NEXT: $dx = MOV16ri 0
# CHECK-NEXT: DBG_VALUE $dl,