[all-commits] [llvm/llvm-project] a838a4: [ARM] Extend search for increment in load/store op...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a838a4f69f500fc8e39fb4c9a1476f162ccf8423
      https://github.com/llvm/llvm-project/commit/a838a4f69f500fc8e39fb4c9a1476f162ccf8423
  Author: David Green <david.green at arm.com>
  Date:   2021-02-15 (Mon, 15 Feb 2021)

  Changed paths:
    M llvm/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
    M llvm/test/CodeGen/ARM/indexed-mem.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/fast-fp-loops.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/mve-float-loops.ll
    M llvm/test/CodeGen/Thumb2/mve-float32regloops.ll
    M llvm/test/CodeGen/Thumb2/mve-postinc-distribute.ll
    M llvm/test/CodeGen/Thumb2/mve-postinc-lsr.ll
    M llvm/test/CodeGen/Thumb2/mve-satmul-loops.ll
    M llvm/test/CodeGen/Thumb2/mve-vecreduce-loops.ll
    M llvm/test/CodeGen/Thumb2/mve-vldshuffle.ll

  Log Message:
  -----------
  [ARM] Extend search for increment in load/store optimizer

Currently the findIncDecAfter will only look at the next instruction for
post-inc candidates in the load/store optimizer. This extends that to a
search through the current BB, until an instruction that modifies or
uses the increment reg is found. This allows more post-inc load/stores
and ldm/stm's to be created, especially in cases where a schedule might
move instructions further apart.

We make sure not to look any further for an SP, as that might invalidate
stack slots that are still in use.

Differential Revision: https://reviews.llvm.org/D95881