[X86][LLVM]Expanding Supports lowerInterleavedLoad() in X86InterleavedAccess…

Authored by m_zuckerman on Sep 7 2017, 7:02 AM.


[X86][LLVM]Expanding Supports lowerInterleavedLoad() in X86InterleavedAccess (VF{8|16|32} stride 3).

This patch expands the support of lowerInterleavedload to {8|16|32}x8i stride 3.

LLVM creates suboptimal shuffle code-gen for AVX2. In overall, this patch is a specific fix for the pattern (Strid=3 VF={8|16|32}) and we plan to include the store (deinterleved side).

The patch goal is to optimize the following sequence:
a0 b0 c0 a1 b1 c1 a2 b2
c2 a3 b3 c3 a4 b4 c4 a5
b5 c5 a6 b6 c6 a7 b7 c7


a0 a1 a2 a3 a4 a5 a6 a7
b0 b1 b2 b3 b4 b5 b6 b7
c0 c1 c2 c3 c4 c5 c6 c7


  1. zvi
  2. igor
  3. guyblank
  4. dorit
  5. Ayal

llvm-svn: 312722