https://llvm.org/bugs/show_bug.cgi?id=27665
Bug ID: 27665
Summary: phi node arguments oscillate with passes licm 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 16316
--> https://llvm.org/bugs/attachment.cgi?id=16316&action=edit
licm_simplifycfg.ll
When using the flags -licm and -simplifycfg on the attached IR
(licm_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:
$ ~/install_dir/llvm/bin/opt -S -licm -simplifycfg licm_simplifycfg.ll >
out1.ll
$ ~/install_dir/llvm/bin/opt -S -licm -simplifycfg out1.ll > out2.ll
$ ~/install_dir/llvm/bin/opt -S -licm -simplifycfg out2.ll > out3.ll
$ ~/install_dir/llvm/bin/opt -S -licm -simplifycfg out3.ll > out4.ll
$ diff out2.ll out1.ll
1c1
< ; ModuleID = 'out1.ll'
---
> ; ModuleID = 'licm_simplifycfg.ll'
24c24
< land.rhs.i.i: ; preds = %while.body.i.i1,
%land.rhs.i.i.preheader
---
> land.rhs.i.i: ; preds =
> %land.rhs.i.i.preheader, %while.body.i.i1
34c34
< %6 = phi i64 [ %1, %while.body.i.i.i ], [ %1, %land.rhs.i.i ], [ undef,
%while.body.i.i1 ]
---
> %6 = phi i64 [ %1, %while.body.i.i.i ], [ undef, %while.body.i.i1 ], [ %1,
> %land.rhs.i.i ]
$ diff out3.ll out2.ll
1c1
< ; ModuleID = 'out2.ll'
---
> ; ModuleID = 'out1.ll'
34c34
< %6 = phi i64 [ %1, %while.body.i.i.i ], [ undef, %while.body.i.i1 ], [ %1,
%land.rhs.i.i ]
---
> %6 = phi i64 [ %1, %while.body.i.i.i ], [ %1, %land.rhs.i.i ], [ undef,
> %while.body.i.i1 ]
$ diff out4.ll out3.ll
1c1
< ; ModuleID = 'out3.ll'
---
> ; ModuleID = 'out2.ll'
34c34
< %6 = phi i64 [ %1, %while.body.i.i.i ], [ %1, %land.rhs.i.i ], [ undef,
%while.body.i.i1 ]
---
> %6 = phi i64 [ %1, %while.body.i.i.i ], [ undef, %while.body.i.i1 ], [ %1,
> %land.rhs.i.i ]
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