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[libc][x86] add MEMCPY_X86_USE_NTA_STORES to config (#188321)

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Add LIBC_CONF_COPT_MEMCPY_X86_USE_NTA_STORES to cmake/bazel/json config.
This commit is contained in:
Ilya Tokar 2026-03-25 15:14:27 -04:00 committed by GitHub
parent c1251ad58b
commit 267b0ea6e8
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3 changed files with 9 additions and 0 deletions
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4
libc/cmake/modules/LLVMLibCCompileOptionRules.cmake
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@ -100,6 +100,10 @@ function(_get_compile_options_from_config output_var)
list(APPEND config_options "-DLIBC_COPT_MEMSET_X86_USE_SOFTWARE_PREFETCHING")
endif()
if(LIBC_CONF_COPT_MEMCPY_X86_USE_NTA_STORES)
list(APPEND config_options "-DLIBC_COPT_MEMCPY_X86_USE_NTA_STORES")
endif()
if(LIBC_TYPES_TIME_T_IS_32_BIT AND LLVM_LIBC_FULL_BUILD)
list(APPEND config_options "-DLIBC_TYPES_TIME_T_IS_32_BIT")
endif()

4
libc/config/config.json
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@ -101,6 +101,10 @@
"LIBC_CONF_MEMSET_X86_USE_SOFTWARE_PREFETCHING": {
"value": false,
"doc": "Inserts prefetch for write instructions (PREFETCHW) for memset on x86 to recover performance when hardware prefetcher is disabled."
},
"LIBC_CONF_COPT_MEMCPY_X86_USE_NTA_STORES": {
"value": false,
"doc": "Use Non-temporal stores in memcpy on x86 to improve performance of large copies."
}
},
"ctype": {

1
utils/bazel/llvm-project-overlay/libc/libc_configure_options.bzl
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@ -24,6 +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_NTA_STORES",
"LIBC_COPT_MEMCPY_X86_USE_SOFTWARE_PREFETCHING",
"LIBC_COPT_MEMSET_X86_USE_SOFTWARE_PREFETCHING",