[libc-commits] [PATCH] D93457: [libc] Align src buffer instead of dst buffer

[Guillaume Chatelet via Phabricator via libc-commits]

gchatelet created this revision.
gchatelet added reviewers: avieira, sivachandra.
Herald added subscribers: libc-commits, ecnelises, tschuett.
Herald added a project: libc-project.
gchatelet requested review of this revision.

We used to align destination buffer instead of source buffer for the loop of block copy.
This is a mistake.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93457

Files:
  libc/src/string/memory_utils/memcpy_utils.h


Index: libc/src/string/memory_utils/memcpy_utils.h
===================================================================
--- libc/src/string/memory_utils/memcpy_utils.h
+++ libc/src/string/memory_utils/memcpy_utils.h
@@ -90,7 +90,7 @@
   CopyBlock<kBlockSize>(dst, src); // Copy first block
 
   // Copy aligned blocks
-  const size_t ofla = offset_from_last_aligned<kBlockSize>(dst);
+  const size_t ofla = offset_from_last_aligned<kBlockSize>(src);
   const size_t limit = count + ofla - kBlockSize;
   for (size_t offset = kBlockSize; offset < limit; offset += kBlockSize)
     CopyBlock<kBlockSize>(dst - ofla + offset, src - ofla + offset);


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