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| author | Silviu Baranga <silviu.baranga@arm.com> | 2015-10-26 10:25:05 +0000 |
|---|---|---|
| committer | Silviu Baranga <silviu.baranga@arm.com> | 2015-10-26 10:25:05 +0000 |
| commit | b892e35520280a64b13e364904a6f7776c873999 (patch) | |
| tree | bbec27113c4ce81e6573bd4a69c0fd9ba55c806c /llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | |
| parent | 72222f5dcafbf19905908197793732fe07458595 (diff) | |
| download | bcm5719-llvm-b892e35520280a64b13e364904a6f7776c873999.tar.gz bcm5719-llvm-b892e35520280a64b13e364904a6f7776c873999.zip | |
[InstCombine] Teach instcombine not to create extra PHI nodes when folding GEPs
Summary:
InstCombine tries to transform GEP(PHI(GEP1, GEP2, ..)) into GEP(GEP(PHI(...))
when possible. However, this may leave the old PHI node around. Even if we
do end up folding the GEPs, having an extra PHI node might not be beneficial.
This change makes the transformation more conservative. We now only do this if
the PHI has only one use, and can therefore be removed after the transformation.
Reviewers: jmolloy, majnemer
Subscribers: mcrosier, mssimpso, llvm-commits
Differential Revision: http://reviews.llvm.org/D13887
llvm-svn: 251281
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp')
0 files changed, 0 insertions, 0 deletions
