https://llvm.org/bugs/show_bug.cgi?id=27696
Bug ID: 27696
Summary: phi node arguments oscillate with passes
loop-vectorize and simplifycfg
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: nwilso...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16345
--> https://llvm.org/bugs/attachment.cgi?id=16345&action=edit
loop-vectorize_simplifycfg.ll
When using the flags -loop-vectorize and -simplifycfg on the attached IR
(loop-vectorize_simplifycfg.ll) the phi node arguments will keep flipping. This
was produced by using the attached IR and using the output as input back to
opt.
For example:
$ ./opt -S -loop-vectorize -simplifycfg loop-vectorize_simplifycfg.ll > out1.ll
$ ./opt -S -loop-vectorize -simplifycfg out1.ll > out2.ll
$ ./opt -S -loop-vectorize -simplifycfg out2.ll > out3.ll
$ diff out2.ll out1.ll
1c1
< ; ModuleID = 'out1.ll'
---
> ; ModuleID = 'loop-vectorize_simplifycfg.ll'
20c20
< %2 = phi i64 [ %__holeIndex, %entry ], [ 0, %while.body.i ], [ undef,
%land.rhs.i ]
---
> %2 = phi i64 [ %__holeIndex, %entry ], [ undef, %land.rhs.i ], [ 0,
> %while.body.i ]
$ diff out3.ll out2.ll
1c1
< ; ModuleID = 'out2.ll'
---
> ; ModuleID = 'out1.ll'
20c20
< %2 = phi i64 [ %__holeIndex, %entry ], [ undef, %land.rhs.i ], [ 0,
%while.body.i ]
---
> %2 = phi i64 [ %__holeIndex, %entry ], [ 0, %while.body.i ], [ undef,
> %land.rhs.i ]
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