[libc-commits] [libc] fe8d211 - [libc] deprecate LLVM_LIBC_MEMCPY_X86_USE_ONLY_REPMOVSB
Guillaume Chatelet via libc-commits
libc-commits at lists.llvm.org
Wed Nov 16 02:34:06 PST 2022
Author: Guillaume Chatelet
Date: 2022-11-16T10:33:20Z
New Revision: fe8d211f1a06f7316391ae33896a2bfe13854b35
URL: https://github.com/llvm/llvm-project/commit/fe8d211f1a06f7316391ae33896a2bfe13854b35
DIFF: https://github.com/llvm/llvm-project/commit/fe8d211f1a06f7316391ae33896a2bfe13854b35.diff
LOG: [libc] deprecate LLVM_LIBC_MEMCPY_X86_USE_ONLY_REPMOVSB
Differential Revision: https://reviews.llvm.org/D136693
Added:
Modified:
libc/src/string/memory_utils/memcpy_implementations.h
Removed:
################################################################################
diff --git a/libc/src/string/memory_utils/memcpy_implementations.h b/libc/src/string/memory_utils/memcpy_implementations.h
index cb9a82856f45..2fa32e3b6110 100644
--- a/libc/src/string/memory_utils/memcpy_implementations.h
+++ b/libc/src/string/memory_utils/memcpy_implementations.h
@@ -65,18 +65,19 @@ inline_memcpy_x86_maybe_interpose_repmovsb(Ptr __restrict dst,
CPtr __restrict src, size_t count) {
// Whether to use rep;movsb exclusively, not at all, or only above a certain
// threshold.
- // TODO: Use only a single preprocessor definition to simplify the code.
#ifndef LLVM_LIBC_MEMCPY_X86_USE_REPMOVSB_FROM_SIZE
#define LLVM_LIBC_MEMCPY_X86_USE_REPMOVSB_FROM_SIZE -1
#endif
- static constexpr bool kUseOnlyRepMovsb =
- LLVM_LIBC_IS_DEFINED(LLVM_LIBC_MEMCPY_X86_USE_ONLY_REPMOVSB);
+#ifdef LLVM_LIBC_MEMCPY_X86_USE_ONLY_REPMOVSB
+#error LLVM_LIBC_MEMCPY_X86_USE_ONLY_REPMOVSB is deprecated use LLVM_LIBC_MEMCPY_X86_USE_REPMOVSB_FROM_SIZE=0 instead.
+#endif // LLVM_LIBC_MEMCPY_X86_USE_ONLY_REPMOVSB
+
static constexpr size_t kRepMovsbThreshold =
LLVM_LIBC_MEMCPY_X86_USE_REPMOVSB_FROM_SIZE;
- if constexpr (kUseOnlyRepMovsb)
+ if constexpr (kRepMovsbThreshold == 0)
return x86::Memcpy::repmovsb(dst, src, count);
- else if constexpr (kRepMovsbThreshold >= 0) {
+ else if constexpr (kRepMovsbThreshold > 0) {
if (unlikely(count >= kRepMovsbThreshold))
return x86::Memcpy::repmovsb(dst, src, count);
else
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