[PATCH] D115602: [X86] Memset is lowered to rep stos if MinSize is present

Sun Dec 12 11:21:03 PST 2021

vdsered added a comment.

Regarding the tests in memset-minsize.ll... I compiled it with llc and then check with llvm-readobj --symbols.

The results how their size changed are in the following table (before and after in bytes):

| Test name                     | Before | After |
| tiny_memset_to_rep_stos       | 5      | 5     |
| small_memset_to_rep_stos      | 8      | 8     |
| medium_memset_to_rep_stos     | 15     | 10    |
| large_memset_to_rep_stos      | 15     | 10    |
| huge_memset_to_rep_stos       | 15     | 10    |
| odd_length_memset_to_rep_stos | 15     | 10    |
| align_1_memset_to_rep_stos    | 15     | 10    |
| align_2_memset_to_rep_stos    | 15     | 11    |
| align_4_memset_to_rep_stos    | 15     | 8     |
| align_8_memset_to_rep_stos    | 15     | 8     |

Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D115602/new/

https://reviews.llvm.org/D115602