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a4e6397fd9
Verify that all paths from the entry block to a virtual register read pass through a def. Enable this check even when MRI->isSSA() is false. Verify that the live range of a virtual register is live out of all predecessor blocks, even for PHI-values. This requires that PHIElimination sometimes inserts IMPLICIT_DEF instruction in predecessor blocks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159150 91177308-0d34-0410-b5e6-96231b3b80d8
27 lines
1015 B
LLVM
27 lines
1015 B
LLVM
; RUN: llc < %s -verify-machineinstrs -verify-coalescing
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;
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; This function has a PHI with one undefined input. Verify that PHIElimination
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; inserts an IMPLICIT_DEF instruction in the predecessor so all paths to the use
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; pass through a def.
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%struct.xx_stack = type { i32, %struct.xx_stack* }
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define i32 @push(%struct.xx_stack* %stack) nounwind uwtable readonly ssp {
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entry:
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%tobool1 = icmp eq %struct.xx_stack* %stack, null
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br i1 %tobool1, label %for.end, label %for.body
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for.body:
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%stack.addr.02 = phi %struct.xx_stack* [ %0, %for.body ], [ %stack, %entry ]
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%next = getelementptr inbounds %struct.xx_stack* %stack.addr.02, i64 0, i32 1
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%0 = load %struct.xx_stack** %next, align 8
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%tobool = icmp eq %struct.xx_stack* %0, null
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br i1 %tobool, label %for.end, label %for.body
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for.end:
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%top.0.lcssa = phi %struct.xx_stack* [ undef, %entry ], [ %stack.addr.02, %for.body ]
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%first = getelementptr inbounds %struct.xx_stack* %top.0.lcssa, i64 0, i32 0
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%1 = load i32* %first, align 4
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ret i32 %1
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}
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