[PATCH] D126588: [RISCV] isel (add (and X, 0x1FFFFFFFE), Y) as (SH1ADD (SRLI X, 1), Y)

[Craig Topper via Phabricator via llvm-commits]

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This pattern is what we get after DAG combine for C code like this.

short *ptr1, *ptr2, *ptr3;
unsigned diff = ptr1 - ptr2;
return ptr3[diff];


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126588

Files:
  llvm/lib/Target/RISCV/RISCVInstrInfoZb.td
  llvm/test/CodeGen/RISCV/rv64zba.ll

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