https://bugs.llvm.org/show_bug.cgi?id=49379
Bug ID: 49379
Summary: "opt -enable-loop-distribute -loop-distribute" failing
with "PHINode should have one entry for each
predecessor of its parent basic block!"
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: mikael.hol...@ericsson.com
CC: llvm-bugs@lists.llvm.org
Created attachment 24578
--> https://bugs.llvm.org/attachment.cgi?id=24578&action=edit
bbi-53389.ll
llvm commit 7b319df29bf
Reproduce with:
opt -enable-loop-distribute -loop-distribute -S -o - bbi-53389.ll
Result:
PHINode should have one entry for each predecessor of its parent basic block!
%1 = phi i16 [ undef, %for.end.lver.orig ], [ 0, %cleanup4.loopexit ]
LLVM ERROR: Broken module found, compilation aborted!
The offending basic block looks like:
cleanup4.lver.orig: ; preds = %for.end.lver.orig
%1 = phi i16 [ undef, %for.end.lver.orig ], [ 0, %cleanup4.loopexit ]
br i1 false, label %lbl1.lver.orig, label %return.us-lcssa.loopexit
and there is no branch from %cleanup4.loopexit to cleanup4.lver.orig.
cleanup4.loopexit looks like:
cleanup4.loopexit: ; No predecessors!
br label %cleanup4
There are blocks in the input that are unreachable from entry. I suppose that
confuses loop-distribute.
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