[PATCH] D46009: [AArch64] Custom Lower MULLH{S, U} for v16i8, v8i16, and v4i32

[Adhemerval Zanella via Phabricator via llvm-commits]

zatrazz created this revision.
zatrazz added reviewers: fhahn, javed.absar, huntergr, SjoerdMeijer, t.p.northover, echristo, evandro, rengolin.
Herald added a subscriber: kristof.beyls.

This patch adds a custom lowering for ISD::MULH{S,U} used on divide by
constant optimization (DAGCombiner::BuildSDIV and DAGCombiner::BuildUDIV).

New patterns for smull and umull are added, so AArch64ISD::{S,U}MULL
can be correctly lowered to smull2 and umull2.


Repository:
  rL LLVM

https://reviews.llvm.org/D46009

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64InstrInfo.td
  test/CodeGen/AArch64/arm64-neon-mul-div-cte.ll
  test/CodeGen/AArch64/neon-idiv.ll

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