tree 2cbeb95db17139bd86f0289c9a442376200f29ca
parent bb3d0e960a93c1b140b7322a306bb5b908a3650e
author Nikita Popov <nikita.ppv@gmail.com> 1547577821 +0000
committer Nikita Popov <nikita.ppv@gmail.com> 1547577821 +0000

Reapply "[CodeGen][X86] Expand USUBSAT to UMAX+SUB, also for vectors"

Related to https://bugs.llvm.org/show_bug.cgi?id=40123.

Rather than scalarizing, expand a vector USUBSAT into UMAX+SUB,
which produces much better code for X86.

Reapplying with updated SLPVectorizer tests.

Differential Revision: https://reviews.llvm.org/D56636

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351219 91177308-0d34-0410-b5e6-96231b3b80d8