[PATCH] D67799: [InstCombine] Fold a shifty implementation of clamp0.
Huihui Zhang via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Sep 19 23:30:53 PDT 2019
huihuiz created this revision.
huihuiz added reviewers: lebedev.ri, efriedma, spatel, kparzysz, bcahoon.
huihuiz added a project: LLVM.
Herald added subscribers: hiraditya, kristof.beyls.
Fold
and(ashr(sub(0, V), ScalarSizeInBits - 1), V)
into
V s< 0 ? 0 : V
where sub hasNoSignedWrap.
https://rise4fun.com/Alive/ZNSs
Fold shift into select enable more optimization, e.g., vmax generation for ARM target.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D67799
Files:
llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
llvm/test/Transforms/InstCombine/sub-ashr-and-to-icmp-select.ll
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D67799.220954.patch
Type: text/x-patch
Size: 5345 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20190920/9dd7f9da/attachment.bin>
More information about the llvm-commits
mailing list