1# RUN: llc -O0 -mtriple x86_64-pc-linux-gnu -run-pass simple-register-coalescing -verify-coalescing -o - %s | FileCheck %s 2 3--- | 4 define i16 @main() { 5 entry: 6 call void @llvm.dbg.value(metadata i8 0, metadata !11, metadata !DIExpression()), !dbg !13 7 ret i16 0 8 } 9 10 ; Function Attrs: nounwind readnone speculatable 11 declare void @llvm.dbg.value(metadata, metadata, metadata) 12 13 !llvm.dbg.cu = !{!0} 14 !llvm.module.flags = !{!3, !4, !5} 15 !llvm.ident = !{!6} 16 17 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 18 !1 = !DIFile(filename: "tmp.c", directory: "") 19 !2 = !{} 20 !3 = !{i32 2, !"Dwarf Version", i32 4} 21 !4 = !{i32 2, !"Debug Info Version", i32 3} 22 !5 = !{i32 1, !"wchar_size", i32 1} 23 !6 = !{!"clang"} 24 !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) 25 !8 = !DISubroutineType(types: !9) 26 !9 = !{!10} 27 !10 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed) 28 !11 = !DILocalVariable(name: "c", scope: !7, file: !1, line: 5, type: !12) 29 !12 = !DIBasicType(name: "mytype", size: 16) 30 !13 = !DILocation(line: 5, column: 11, scope: !7) 31 32... 33--- 34name: main 35tracksRegLiveness: true 36body: | 37 bb.0.entry: 38 %0:gr16_abcd = MOV16ri 0 39 DBG_VALUE %0.sub_8bit:gr16_abcd, $noreg, !11, !DIExpression(), debug-location !13 40 undef %6.sub_8bit:gr16_abcd = COPY killed %0.sub_8bit 41 dead $dx = COPY killed %6 42 43... 44 45# Verify that we get $dl in the DBG_VALUE (and not $dx.sub_8bit as we used to 46# do before the bugfix, which resulted in "Bad machine code: Illegal 47# subregister index for physical register"). 48# 49# CHECK: bb.0.entry: 50# CHECK-NEXT: $dx = MOV16ri 0 51# CHECK-NEXT: DBG_VALUE $dl, 52