[llvm] [reland][libc][bazel] Enable software prefetching for memcpy (PR #113886)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: Guillaume Chatelet (gchatelet)

<details>
<summary>Changes</summary>

This will affect only Bazel configuration for now.
This is a reland of #<!-- -->108939 which has been reverted because of codegen
issues fixed by https://github.com/llvm/llvm-project/pull/113161.


---
Full diff: https://github.com/llvm/llvm-project/pull/113886.diff


1 Files Affected:

- (modified) utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl (+1-1) 


``````````diff
diff --git a/utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl b/utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl
index f65da9e98226b6..96d7fa86e9ddf2 100644
--- a/utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl
+++ b/utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl
@@ -24,7 +24,7 @@ LIBC_CONFIGURE_OPTIONS = [
     # Documentation in libc/src/string/memory_utils/...
     # "LIBC_COPT_MEMCPY_USE_EMBEDDED_TINY",
     # "LIBC_COPT_MEMCPY_X86_USE_REPMOVSB_FROM_SIZE",
-    # "LIBC_COPT_MEMCPY_X86_USE_SOFTWARE_PREFETCHING",
+    "LIBC_COPT_MEMCPY_X86_USE_SOFTWARE_PREFETCHING",
     "LIBC_COPT_MEMSET_X86_USE_SOFTWARE_PREFETCHING",
 
     # Documentation in libc/docs/dev/printf_behavior.rst

``````````

</details>


https://github.com/llvm/llvm-project/pull/113886