49 lines
2.0 KiB
LLVM
49 lines
2.0 KiB
LLVM
; RUN: llc -start-after=codegenprepare -stop-before=finalize-isel -o - < %s | FileCheck %s
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; Test for correct placement of DBG_VALUE, which in PR40427 is placed before
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; the load instruction it refers to. The circumstance replicated here is where
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; two instructions in a row, trunc and add, begin with no-op Copy{To,From}Reg
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; SDNodes that produce no instructions.
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; The DBG_VALUE instruction should come immediately after the load instruction
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; because the truncate is optimised out, and the DBG_VALUE should be placed
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; in front of the first instruction that occurs after the dbg.value.
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; CHECK: ![[DBGVAR:[0-9]+]] = !DILocalVariable(name: "bees",
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target triple = "x86_64-unknown-linux-gnu"
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define i16 @lolwat(i1 %spoons, i64 *%bees, i16 %yellow, i64 *%more) {
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entry:
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br i1 %spoons, label %trueb, label %falseb
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trueb:
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br label %block
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falseb:
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br label %block
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block:
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; CHECK: [[PHIREG:%[0-9]+]]:gr64 = PHI %6, %bb.2, %4, %bb.1
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; CHECK-NEXT: [[LOADR:%[0-9]+]]:gr16 = MOV16rm %0
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; CHECK-NEXT: DBG_VALUE [[LOADR]], $noreg, ![[DBGVAR]]
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; CHECK-NEXT: %{{[0-9]+}}:gr32 = IMPLICIT_DEF
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%foo = phi i64 *[%bees, %trueb], [%more, %falseb]
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%forks = bitcast i64 *%foo to i32 *
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%ret = load i32, i32 *%forks, !dbg !6
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%cast = trunc i32 %ret to i16, !dbg !6
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call void @llvm.dbg.value(metadata i16 %cast, metadata !1, metadata !DIExpression()), !dbg !6
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%orly2 = add i16 %yellow, 1
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br label %bb1
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bb1:
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%cheese = add i16 %orly2, %cast
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ret i16 %cheese, !dbg !6
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.module.flags = !{!4}
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!llvm.dbg.cu = !{!2}
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!1 = !DILocalVariable(name: "bees", scope: !5, type: null)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "beards", isOptimized: true, runtimeVersion: 4, emissionKind: FullDebug)
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!3 = !DIFile(filename: "bees.cpp", directory: "")
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = distinct !DISubprogram(name: "nope", scope: !2, file: !3, line: 1, unit: !2)
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!6 = !DILocation(line: 0, scope: !5)
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!7 = !DILocalVariable(name: "flannel", scope: !5, type: null)
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