1# RUN: llc -O1 -start-after simple-register-coalescing -o - %s | FileCheck %s 2 3--- | 4 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 5 target triple = "x86_64-pc-linux-gnu" 6 7 define i16 @foo(i8 %zzz) !dbg !4 { 8 entry: 9 ret i16 1 10 } 11 12 ; Function Attrs: nounwind readnone speculatable 13 declare void @llvm.dbg.value(metadata, metadata, metadata) 14 15 !llvm.dbg.cu = !{!0} 16 !llvm.module.flags = !{!3} 17 18 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2) 19 !1 = !DIFile(filename: "test.c", directory: "") 20 !2 = !{} 21 !3 = !{i32 1, !"Debug Info Version", i32 3} 22 !4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0) 23 !5 = !DISubroutineType(types: !6) 24 !6 = !{null} 25 !7 = !DILocalVariable(name: "zzz", arg: 1, scope: !4, file: !1, line: 3, type: !8) 26 !8 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed) 27 !9 = !DILocation(line: 0, scope: !4) 28 !10 = !DILocation(line: 4, column: 22, scope: !11) 29 !11 = distinct !DILexicalBlock(scope: !4, file: !1, line: 3, column: 19) 30 31... 32--- 33name: foo 34tracksRegLiveness: true 35body: | 36 bb.0: 37 %0:gr16_abcd = MOV16ri 1 38 39 bb.1: 40 DBG_VALUE %0.sub_8bit_hi, $noreg, !7, !DIExpression(), debug-location !9 41 %1:gr16 = COPY %0 42 %2:gr16 = COPY %0 43 44 bb.2: 45 $ax = COPY %1 46 $dx = COPY %2 47 RETQ killed $ax, killed $dx 48... 49 50# This test case was created as a reproducer for a bug when we got incorrect 51# DBG_VALUE instructions after regalloc like this: 52# 53# movw $1, %cx 54# #DEBUG_VALUE: foo:zzz <- $ch 55# movl %ecx, %eax 56# #DEBUG_VALUE: foo:zzz <- $ax 57# 58# The above is incorrect since the DBG_VALUE in the input is refering to the 59# hi subreg, so after the COPY/movl the value is in $ah and not $ax (nor $al). 60# 61# We currently only get one DEBUG_VALUE here. In the future we could allow a 62# second DEBUG_VALUE, as long as it is mapped to the hi subreg of the movl 63# dst. 64# 65# CHECK-NOT: #DEBUG_VALUE: 66# CHECK: #DEBUG_VALUE: foo:zzz <- ${{[abcd]+}}h 67# CHECK-NOT: #DEBUG_VALUE: 68