[PATCH] D111034: [AArch64] Optimize add/sub with immediate

[Ben Shi via Phabricator via llvm-commits]

benshi001 created this revision.
benshi001 added reviewers: dmgreen, craig.topper, jaykang10, efriedma, SjoerdMeijer.
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Optimize ([add|sub] r, imm) -> ([ADD|SUB] ([ADD|SUB] r, #imm0, lsl #12), imm1),
if imm == (imm0<<12)+imm1. and both imm0 and imm1 are non-zero 12-bit unsigned
integers.

Optimize ([add|sub] r, imm) -> ([SUB|ADD] ([SUB|ADD] r, #imm0, lsl #12), imm1),
if imm == -(imm0<<12)-imm1, and both imm0 and imm1 are non-zero 12-bit unsigned
integers.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111034

Files:
  llvm/lib/Target/AArch64/AArch64MIPeepholeOpt.cpp
  llvm/test/CodeGen/AArch64/addsub.ll
  llvm/test/Transforms/CodeGenPrepare/AArch64/large-offset-gep.ll

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