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5 Commits

Author SHA1 Message Date
Amaury Sechet bdb261b4c0 Imporove load to store => memcpy 
Summary: This now try to reorder instructions in order to help create the optimizable pattern.

Reviewers: craig.topper, spatel, dexonsmith, Prazek, chandlerc, joker.eph, majnemer

Differential Revision: http://reviews.llvm.org/D16523

llvm-svn: 263503
 2016-03-14 22:52:27 +00:00
Mehdi Amini 0535003bef Fix PR26051: Memcpy optimization should introduce a call to memcpy before the store destination position 
This is a conservative fix, I expect Amaury to relax this.
Follow-up for r256923

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 256999
 2016-01-06 23:50:22 +00:00
Amaury Sechet 3235c08253 Promote aggregate store to memset when possible 
Summary: As per title. This will allow the optimizer to pick up on it.

Reviewers: craig.topper, spatel, dexonsmith, Prazek, chandlerc, joker.eph, majnemer

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D15923

llvm-svn: 256969
 2016-01-06 19:47:24 +00:00
Amaury Sechet d3b2c0fd94 Improve load/store to memcpy for aggregate 
Summary: It turns out that if we don't try to do it at the store location, we can do it before any operation that alias the load, as long as no operation alias the store.

Reviewers: craig.topper, spatel, dexonsmith, Prazek, chandlerc, joker.eph

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D15903

llvm-svn: 256923
 2016-01-06 09:30:39 +00:00
Amaury Sechet a0c242cdfd Implement load to store => memcpy in MemCpyOpt for aggregates 
Summary:
Most of the tool chain is able to optimize scalar and memcpy like operation effisciently while it isn't that good with aggregates. In order to improve the support of aggregate, we try to change aggregate manipulation into either scalar or memcpy like ones whenever possible without loosing informations.

This is one such opportunity.

Reviewers: craig.topper, spatel, dexonsmith, Prazek, chandlerc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D15894

llvm-svn: 256868
 2016-01-05 20:17:48 +00:00