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5fe7f3e187
Trace through multiple COPYs when looking for a physreg source. Add hinting for vregs that will be copied into physregs (we only hinted for vregs getting copied to a physreg previously). Give hinted a register a bonus when deciding which value to spill. This is part of my rewrite regallocfast series. In fact this one doesn't even have an effect unless you also flip the allocation to happen from back to front of a basic block. Nonetheless it helps to split this up to ease review of D52010 Patch by Matthias Braun llvm-svn: 360887
39 lines
1.7 KiB
LLVM
39 lines
1.7 KiB
LLVM
; RUN: llc %s -mtriple=x86_64-pc-linux-gnu -O0 -o - | FileCheck %s
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; We are testing that a value in a 16 bit register gets reported as
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; being in its superregister.
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; CHECK: .byte 85 # super-register DW_OP_reg5
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; No need to a piece at offset 0.
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; CHECK-NOT: DW_OP_piece
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; CHECK-NOT: DW_OP_bit_piece
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define i16 @f(i16 signext %zzz) nounwind !dbg !1 {
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entry:
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call void @llvm.dbg.value(metadata i16 %zzz, metadata !0, metadata !DIExpression()), !dbg !DILocation(scope: !1)
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br label %exit
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exit:
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%conv = sext i16 %zzz to i32, !dbg !7
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%conv1 = trunc i32 %conv to i16
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ret i16 %conv1
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!11}
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!9 = !{!1}
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!0 = !DILocalVariable(name: "zzz", line: 3, arg: 1, scope: !1, file: !2, type: !6)
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!1 = distinct !DISubprogram(name: "f", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !3, scopeLine: 3, file: !10, scope: !2, type: !4)
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!2 = !DIFile(filename: "/home/espindola/llvm/test.c", directory: "/home/espindola/tmpfs/build")
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!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 ()", isOptimized: false, emissionKind: FullDebug, file: !10, enums: !{}, retainedTypes: !{}, imports: null)
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!4 = !DISubroutineType(types: !5)
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!5 = !{null}
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "short", size: 16, align: 16, encoding: DW_ATE_signed)
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!7 = !DILocation(line: 4, column: 22, scope: !8)
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!8 = distinct !DILexicalBlock(line: 3, column: 19, file: !10, scope: !1)
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!10 = !DIFile(filename: "/home/espindola/llvm/test.c", directory: "/home/espindola/tmpfs/build")
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!11 = !{i32 1, !"Debug Info Version", i32 3}
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