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The splitIndirectCriticalEdges function generates and invalid CFG when the 'Target' basic block is a loop to itself. When this occurs, the code that updates the predecessor terminator needs to update the terminator in the split basic block. This occurs when there is an edge from block D back to D. Since D is split in to D0 and D1, the code needs to update the terminator in D1. But D1 is not in the OtherPreds vector, so it was not getting updated. Differential Revision: https://reviews.llvm.org/D32126 llvm-svn: 300480
38 lines
906 B
LLVM
38 lines
906 B
LLVM
; RUN: opt -codegenprepare -S < %s | FileCheck %s
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; Test that an invalid CFG is not created by splitIndirectCriticalEdges
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; transformation when the 'target' block is a loop to itself.
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; CHECK: .split:
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; CHECK: br label %while.body.clone
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; CHECK: if.else1:
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; CHECK: indirectbr
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; CHECK: while.body.clone:
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; CHECK: br label %.split
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define void @test() {
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entry:
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br label %if.else
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if.else:
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br i1 undef, label %while.body, label %preheader
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preheader:
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br label %if.else1
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if.then:
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unreachable
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while.body:
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%dest.sroa = phi i32 [ %1, %while.body ], [ undef, %if.else1 ], [ undef, %if.else ]
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%0 = inttoptr i32 %dest.sroa to i8*
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%incdec.ptr = getelementptr inbounds i8, i8* %0, i32 -1
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%1 = ptrtoint i8* %incdec.ptr to i32
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store i8 undef, i8* %incdec.ptr, align 1
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br label %while.body
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if.else1:
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indirectbr i8* undef, [label %if.then, label %while.body, label %if.else, label %if.else1]
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}
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