[llvm] Revert "[reland][libc][bazel] Enable software prefetching for memcpy" (PR #127189)
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Fri Feb 14 02:15:20 PST 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libc
Author: Guillaume Chatelet (gchatelet)
<details>
<summary>Changes</summary>
Reverts llvm/llvm-project#<!-- -->113886
We suspect this has caused internal performance regressions, reverting while root causing it more thoroughly.
---
Full diff: https://github.com/llvm/llvm-project/pull/127189.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 96d7fa86e9ddf..f65da9e98226b 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/127189
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