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[InstCombine] Optimize always overflowing signed saturating add/sub
authorNikita Popov <nikita.ppv@gmail.com>
Wed, 29 May 2019 18:37:13 +0000 (18:37 +0000)
committerNikita Popov <nikita.ppv@gmail.com>
Wed, 29 May 2019 18:37:13 +0000 (18:37 +0000)
commit2a507f15555c34ea28b5c5d2c505034e09a9465f
treec7b4c03c1fecb6c0f1acafb56778fa8d7f2e430atree | snapshot
parent602acbf7d42dc1eafd36017ad33b933d0e4da2becommit | diff
[InstCombine] Optimize always overflowing signed saturating add/sub

Based on the overflow direction information added in D62463, we can
now fold always overflowing signed saturating add/sub to signed min/max.

Differential Revision: https://reviews.llvm.org/D62544

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362006 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Transforms/InstCombine/InstCombineCalls.cpp diff | blob | history
test/Transforms/InstCombine/saturating-add-sub.ll diff | blob | history
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