[PATCH] D39729: [X86][SSE] Use (V)PHMINPOSUW for vXi16 SMAX/SMIN/UMAX/UMIN horizontal reductions (PR32841)
Simon Pilgrim via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Nov 7 04:27:42 PST 2017
RKSimon created this revision.
(V)PHMINPOSUW determines the UMIN element in an v8i16 input, with suitable bit flipping it can also be used for SMAX/SMIN/UMAX cases as well.
This patch matches vXi16 SMAX/SMIN/UMAX/UMIN horizontal reductions and reduces the input down to a v8i16 vector before calling (V)PHMINPOSUW.
I can split the commits into X86ISD::PHMINPOS, UMIN reduction and SMAX/SMIN/UMAX reduction stages if it would make things clearer.
A later patch will use this for v16i8 reductions as well (PR32841).
Depending on when https://reviews.llvm.org/D39726 lands I might need to update this to use that as well.
Repository:
rL LLVM
https://reviews.llvm.org/D39729
Files:
lib/Target/X86/X86ISelLowering.cpp
lib/Target/X86/X86ISelLowering.h
lib/Target/X86/X86InstrFragmentsSIMD.td
lib/Target/X86/X86InstrSSE.td
lib/Target/X86/X86IntrinsicsInfo.h
test/CodeGen/X86/horizontal-reduce-smax.ll
test/CodeGen/X86/horizontal-reduce-smin.ll
test/CodeGen/X86/horizontal-reduce-umax.ll
test/CodeGen/X86/horizontal-reduce-umin.ll
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