[PATCH] D50239: [X86] Add the custom ABS expanding and change the SAD pattern recognizer.
Ivan Kulagin via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Aug 3 03:46:46 PDT 2018
ikulagin created this revision.
ikulagin added reviewers: craig.topper, spatel, kparzysz, RKSimon.
Herald added a subscriber: llvm-commits.
These changes are required for https://reviews.llvm.org/D49837 and add support of the ABS node
for the SAD pattern recognizer and the custom ABS expanding.
The i64 result of the ABS is expanded to
tmp = (SRA, Hi, 31)
Lo = (UADDO tmp, Lo)
Hi = (XOR tmp, (ADDCARRY tmp, hi, Lo:1))
Lo = (XOR tmp, Lo)
The "detectZextAbsDiff" function is changed for the recognition of pattern
with the ABS node. Given an ABS node, detect the following pattern:
(ABS (SUB (ZERO_EXTEND a), (ZERO_EXTEND b))).
Repository:
rL LLVM
https://reviews.llvm.org/D50239
Files:
lib/Target/X86/X86ISelLowering.cpp
test/CodeGen/X86/combine-abs.ll
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