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[libc] optimize bzero/memset for x86

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This is simpy using the x86 optimized elements when targetting x86 cpus.

Differential Revision: https://reviews.llvm.org/D106551
This commit is contained in:
Guillaume Chatelet
2021-07-23 12:19:55 +00:00
parent 71d0fd3564
commit 24ffb98f9d
1 changed files with 16 additions and 11 deletions
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27
libc/src/string/memory_utils/memset_utils.h
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@@ -49,28 +49,33 @@ namespace __llvm_libc {
// superior for sizes that mattered.
inline static void GeneralPurposeMemset(char *dst, unsigned char value,
size_t count) {
#if defined(__i386__) || defined(__x86_64__)
using namespace ::__llvm_libc::x86;
#else
using namespace ::__llvm_libc::scalar;
#endif
if (count == 0)
return;
if (count == 1)
return SplatSet<scalar::_1>(dst, value);
return SplatSet<_1>(dst, value);
if (count == 2)
return SplatSet<scalar::_2>(dst, value);
return SplatSet<_2>(dst, value);
if (count == 3)
return SplatSet<scalar::_3>(dst, value);
return SplatSet<_3>(dst, value);
if (count == 4)
return SplatSet<scalar::_4>(dst, value);
return SplatSet<_4>(dst, value);
if (count <= 8)
return SplatSet<HeadTail<scalar::_4>>(dst, value, count);
return SplatSet<HeadTail<_4>>(dst, value, count);
if (count <= 16)
return SplatSet<HeadTail<scalar::_8>>(dst, value, count);
return SplatSet<HeadTail<_8>>(dst, value, count);
if (count <= 32)
return SplatSet<HeadTail<scalar::_16>>(dst, value, count);
return SplatSet<HeadTail<_16>>(dst, value, count);
if (count <= 64)
return SplatSet<HeadTail<scalar::_32>>(dst, value, count);
return SplatSet<HeadTail<_32>>(dst, value, count);
if (count <= 128)
return SplatSet<HeadTail<scalar::_64>>(dst, value, count);
return SplatSet<Align<scalar::_32, Arg::Dst>::Then<Loop<scalar::_32>>>(
dst, value, count);
return SplatSet<HeadTail<_64>>(dst, value, count);
return SplatSet<Align<_32, Arg::Dst>::Then<Loop<_32>>>(dst, value, count);
}
} // namespace __llvm_libc