[PATCH] D47345: [InstructionCombing] Replace small allocations with local/global variable

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 created this revision.
Herald added a subscriber: llvm-commits.

Requires constant size to be allocated

nt main(void) {

  char *ptr = malloc(8000000 * sizeof(char)); // SIZE
  
  strcpy(ptr, "test");
  puts(ptr);
  
  free(ptr);

}

if SIZE < threshold (currently 256)

  -> create something like "char ptr[size]"

else

  -> create global variable 

Fires 56x in MultiSource benchmark.

Tests would be added later, after an initial discussion.


Repository:
  rL LLVM

https://reviews.llvm.org/D47345

Files:
  lib/Transforms/InstCombine/InstCombineInternal.h
  lib/Transforms/InstCombine/InstructionCombining.cpp

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