[PATCH] D35303: [X86][SSE] Add pre-AVX2 support for (i32 bitcast(v32i1)) -> 2xMOVMSK

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.

Currently we only support (i32 bitcast(v32i1)) using the AVX2 VPMOVMSKB ymm instruction.

This patch adds support for splitting pre-AVX2 targets into 2 x (V)PMOVMSKB xmm instructions and merging the integer results.

In future we could probably generalize this to handle more cases.


Repository:
  rL LLVM

https://reviews.llvm.org/D35303

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/bitcast-and-setcc-256.ll
  test/CodeGen/X86/bitcast-and-setcc-512.ll
  test/CodeGen/X86/bitcast-setcc-256.ll
  test/CodeGen/X86/bitcast-setcc-512.ll

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