| # RUN: llc -O1 -start-after simple-register-coalescing -o - %s | FileCheck %s |
| |
| --- | |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-pc-linux-gnu" |
| |
| define i16 @foo(i8 %zzz) !dbg !4 { |
| entry: |
| ret i16 1 |
| } |
| |
| ; Function Attrs: nounwind readnone speculatable |
| declare void @llvm.dbg.value(metadata, metadata, metadata) |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!3} |
| |
| !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2) |
| !1 = !DIFile(filename: "test.c", directory: "") |
| !2 = !{} |
| !3 = !{i32 1, !"Debug Info Version", i32 3} |
| !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) |
| !5 = !DISubroutineType(types: !6) |
| !6 = !{null} |
| !7 = !DILocalVariable(name: "zzz", arg: 1, scope: !4, file: !1, line: 3, type: !8) |
| !8 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed) |
| !9 = !DILocation(line: 0, scope: !4) |
| !10 = !DILocation(line: 4, column: 22, scope: !11) |
| !11 = distinct !DILexicalBlock(scope: !4, file: !1, line: 3, column: 19) |
| |
| ... |
| --- |
| name: foo |
| tracksRegLiveness: true |
| body: | |
| bb.0: |
| %0:gr16_abcd = MOV16ri 1 |
| |
| bb.1: |
| DBG_VALUE %0.sub_8bit_hi, $noreg, !7, !DIExpression(), debug-location !9 |
| %1:gr16 = COPY %0 |
| %2:gr16 = COPY %0 |
| |
| bb.2: |
| $ax = COPY %1 |
| $dx = COPY %2 |
| RETQ killed $ax, killed $dx |
| ... |
| |
| # This test case was created as a reproducer for a bug when we got incorrect |
| # DBG_VALUE instructions after regalloc like this: |
| # |
| # movw $1, %cx |
| # #DEBUG_VALUE: foo:zzz <- $ch |
| # movl %ecx, %eax |
| # #DEBUG_VALUE: foo:zzz <- $ax |
| # |
| # The above is incorrect since the DBG_VALUE in the input is refering to the |
| # hi subreg, so after the COPY/movl the value is in $ah and not $ax (nor $al). |
| # |
| # We currently only get one DEBUG_VALUE here. In the future we could allow a |
| # second DEBUG_VALUE, as long as it is mapped to the hi subreg of the movl |
| # dst. |
| # |
| # CHECK-NOT: #DEBUG_VALUE: |
| # CHECK: #DEBUG_VALUE: foo:zzz <- ${{[abcd]+}}h |
| # CHECK-NOT: #DEBUG_VALUE: |