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Author SHA1 Message Date
Vadzim Dambrouski fd10286e04 [ARM] Fix PR37382: Don't optimize mul.with.overflow on thumbv6m. 
Reviewers: efriedma, rogfer01, javed.absar

Reviewed By: efriedma, rogfer01

Subscribers: kristof.beyls, chrib, llvm-commits

Differential Revision: https://reviews.llvm.org/D48846

llvm-svn: 336144
 2018-07-02 21:05:26 +00:00
Joel Galenson dbc724f764 [ARM] Fix perf regression in compare optimization. 
Fix a performance regression caused by r322737.

While trying to make it easier to replace compares with existing adds and
subtracts, I accidentally stopped it from doing so in some cases.  This should
fix that.  I'm also fixing another potential bug in that commit.

Differential Revision: https://reviews.llvm.org/D42263

llvm-svn: 322972
 2018-01-19 17:46:27 +00:00
Joel Galenson bbcaf4ac5c [ARM] Optimize {s,u}mul.with.overflow. 
This extends my previous patches to also optimize overflow-checked multiplies during SelectionDAG.

Differential revision: https://reviews.llvm.org/D40922

llvm-svn: 322738
 2018-01-17 19:19:05 +00:00