[all-commits] [llvm/llvm-project] ab4fc8: [DAG] Emit table lookup from TargetLowering::expan...

shubhamnarlawar via All-commits all-commits at lists.llvm.org
Mon Aug 8 04:08:19 PDT 2022

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ab4fc87a9d96d759df3c287fd63892165e60e526
  Author: Shubham Narlawar <shubham.narlawar at rrlogic.co.in>
  Date:   2022-08-08 (Mon, 08 Aug 2022)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/test/CodeGen/ARM/cttz.ll
    M llvm/test/CodeGen/RISCV/ctlz-cttz-ctpop.ll
    M llvm/test/CodeGen/RISCV/rv32zbb.ll
    M llvm/test/CodeGen/RISCV/rv64zbb.ll
    A llvm/test/CodeGen/SPARC/cttz.ll

  Log Message:
  [DAG] Emit table lookup from TargetLowering::expandCTTZ()

This patch emits table lookup in expandCTTZ.

Context -
https://reviews.llvm.org/D113291 transforms set of IR instructions to
cttz intrinsic but there are some targets which does not support CTTZ or
CTLZ. Hence, I generate a table lookup in TargetLowering::expandCTTZ().

Differential Revision: https://reviews.llvm.org/D128911

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