[all-commits] [llvm/llvm-project] 5a1d85: [InstCombine] Canonicalize `gep T, (gep i8, base, ...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5a1d85051fa4847b6a3fe4cae30e0a11843bec41
      https://github.com/llvm/llvm-project/commit/5a1d85051fa4847b6a3fe4cae30e0a11843bec41
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-04-26 (Fri, 26 Apr 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
    A llvm/test/Transforms/InstCombine/gepofconstgepi8.ll

  Log Message:
  -----------
  [InstCombine] Canonicalize `gep T, (gep i8, base, C1), (Index + C2)` into `gep T, (gep i8, base, C1 + C2 * sizeof(T)), Index` (#76177)

This patch tries to canonicalize `gep T, (gep i8, base, C1), (Index +
C2)` into `gep T, (gep i8, base, C1 + C2 * sizeof(T)), Index`.

Alive2: https://alive2.llvm.org/ce/z/dxShKF
Fixes regressions found in
https://github.com/llvm/llvm-project/pull/68882.



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