[all-commits] [llvm/llvm-project] b373b5: Enabling the copy-constant-to-alloca optimization ...

[Andy Kaylor via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b373b5990d5991a920c421b21a352e4ccf4c4993
      https://github.com/llvm/llvm-project/commit/b373b5990d5991a920c421b21a352e4ccf4c4993
  Author: Andy Kaylor <andrew.kaylor at intel.com>
  Date:   2021-07-27 (Tue, 27 Jul 2021)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
    M llvm/test/Transforms/InstCombine/memcpy-from-global.ll

  Log Message:
  -----------
  Enabling the copy-constant-to-alloca optimization in more instances

Patch by Mohammad Fawaz

This patch allows lifetime calls to be ignored (and later erased) if we
know that the copy-constant-to-alloca optimization is going to happen.
The case that is missed is when the global variable is in a different address
space than the alloca (as shown in the example added to the lit test.)

This used to work before https://github.com/llvm/llvm-project/commit/6da31fa4a61d68af21dfa1e144e726ed6d77903e

Differential Revision: https://reviews.llvm.org/D106573