[PATCH] D62449: [X86][SSE] Improve bool vector extload (PR26091)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel, lebedev.ri.
Herald added a project: LLVM.

We already have good codegen for (vXiY *ext(vXi1 bitcast(iX))) cases, this patch uses it for ext-loads of vXi1 types as well - changing the load into a iX integer load, and bitcasting+extending so that combineToExtendBoolVectorInReg can then use it.

What's curious is how much we're using MOVD (VMOVDI2PDIrm) scalar_to_vector loads directly for smaller (<i32) memory sources - I don't THINK this is something I've introduced but its something that looks potentially concerning - @craig.topper any ideas?


Repository:
  rL LLVM

https://reviews.llvm.org/D62449

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-sext-widen.ll
  test/CodeGen/X86/vector-sext.ll

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