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23c462a8b5
This allows targets to make more decisions about reserved registers after isel. For example, now it should be certain there are calls or stack objects in the frame or not, which could have been introduced by legalization. Patch by Matthias Braun llvm-svn: 363757
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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