tree f9896477fcf1a3044917b08a745b4a2cbf50eb24
parent 595cc08b386094d7da807582701e661db860b3da
author Sanjay Patel <spatel@rotateright.com> 1547132692 +0000
committer Sanjay Patel <spatel@rotateright.com> 1547132692 +0000

[x86] fix horizontal binop matching for 256-bit vectors (PR40243)

This is a partial fix for:
https://bugs.llvm.org/show_bug.cgi?id=40243
...as seen in the integer test, we still need to correct the result when using the 
existing (old) horizontal op matching function because it does not model the way 
x86 256-bit horizontal ops return results (each 128-bit half is its own horizontal-op). 
A potential follow-up change for that is discussed in the bug report - see also D56490.

This generally duplicates a lot of the existing matching code, but we can't just remove 
that without introducing regressions, so the existing code is renamed and used less often. 
Follow-ups may try to reduce that overlap.

Differential Revision: https://reviews.llvm.org/D56450


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350826 91177308-0d34-0410-b5e6-96231b3b80d8