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/*
* Copyright (C) 2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/text/StringCommon.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace WTF {
SUPPRESS_ASAN
const float* findFloatAlignedImpl(const float* pointer, float target, size_t length)
{
ASSERT(!(reinterpret_cast<uintptr_t>(pointer) & 0b11));
constexpr simde_uint32x4_t indexMask { 0, 1, 2, 3 };
ASSERT(length);
ASSERT(!(reinterpret_cast<uintptr_t>(pointer) & 0xf));
ASSERT((reinterpret_cast<uintptr_t>(pointer) & ~static_cast<uintptr_t>(0xf)) == reinterpret_cast<uintptr_t>(pointer));
const float* cursor = pointer;
constexpr size_t stride = SIMD::stride<float>;
simde_float32x4_t targetsVector = simde_vdupq_n_f32(target);
while (true) {
simde_float32x4_t value = simde_vld1q_f32(cursor);
simde_uint32x4_t mask = simde_vceqq_f32(value, targetsVector);
if (simde_vget_lane_u64(simde_vreinterpret_u64_u16(simde_vmovn_u32(mask)), 0)) {
simde_uint32x4_t ranked = simde_vornq_u32(indexMask, mask);
uint32_t index = simde_vminvq_u32(ranked);
return (index < length) ? cursor + index : nullptr;
}
if (length <= stride)
return nullptr;
length -= stride;
cursor += stride;
}
}
SUPPRESS_ASAN
const double* findDoubleAlignedImpl(const double* pointer, double target, size_t length)
{
ASSERT(!(reinterpret_cast<uintptr_t>(pointer) & 0b111));
constexpr simde_uint32x2_t indexMask { 0, 1 };
ASSERT(length);
ASSERT(!(reinterpret_cast<uintptr_t>(pointer) & 0xf));
ASSERT((reinterpret_cast<uintptr_t>(pointer) & ~static_cast<uintptr_t>(0xf)) == reinterpret_cast<uintptr_t>(pointer));
const double* cursor = pointer;
constexpr size_t stride = SIMD::stride<double>;
simde_float64x2_t targetsVector = simde_vdupq_n_f64(target);
while (true) {
simde_float64x2_t value = simde_vld1q_f64(cursor);
simde_uint64x2_t mask = simde_vceqq_f64(value, targetsVector);
simde_uint32x2_t reducedMask = simde_vmovn_u64(mask);
if (simde_vget_lane_u64(simde_vreinterpret_u64_u32(reducedMask), 0)) {
simde_uint32x2_t ranked = simde_vorn_u32(indexMask, reducedMask);
uint32_t index = simde_vminv_u32(ranked);
return (index < length) ? cursor + index : nullptr;
}
if (length <= stride)
return nullptr;
length -= stride;
cursor += stride;
}
}
SUPPRESS_ASAN
const LChar* find8NonASCIIAlignedImpl(std::span<const LChar> data)
{
constexpr simde_uint8x16_t indexMask { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
auto* pointer = data.data();
auto length = data.size();
ASSERT(length);
ASSERT(!(reinterpret_cast<uintptr_t>(pointer) & 0xf));
ASSERT((reinterpret_cast<uintptr_t>(pointer) & ~static_cast<uintptr_t>(0xf)) == reinterpret_cast<uintptr_t>(pointer));
const uint8_t* cursor = std::bit_cast<const uint8_t*>(pointer);
constexpr size_t stride = SIMD::stride<uint8_t>;
simde_uint8x16_t charactersVector = simde_vdupq_n_u8(0x80);
while (true) {
simde_uint8x16_t value = simde_vld1q_u8(cursor);
simde_uint8x16_t mask = simde_vcgeq_u8(value, charactersVector);
if (simde_vmaxvq_u8(mask)) {
simde_uint8x16_t ranked = simde_vornq_u8(indexMask, mask);
uint8_t index = simde_vminvq_u8(ranked);
return std::bit_cast<const LChar*>((index < length) ? cursor + index : nullptr);
}
if (length <= stride)
return nullptr;
length -= stride;
cursor += stride;
}
}
SUPPRESS_ASAN
const UChar* find16NonASCIIAlignedImpl(std::span<const UChar> data)
{
auto* pointer = data.data();
auto length = data.size();
ASSERT(!(reinterpret_cast<uintptr_t>(pointer) & 0x1));
constexpr simde_uint16x8_t indexMask { 0, 1, 2, 3, 4, 5, 6, 7 };
ASSERT(length);
ASSERT(!(reinterpret_cast<uintptr_t>(pointer) & 0xf));
ASSERT((reinterpret_cast<uintptr_t>(pointer) & ~static_cast<uintptr_t>(0xf)) == reinterpret_cast<uintptr_t>(pointer));
const uint16_t* cursor = std::bit_cast<const uint16_t*>(pointer);
constexpr size_t stride = SIMD::stride<uint16_t>;
simde_uint16x8_t charactersVector = simde_vdupq_n_u16(0x80);
while (true) {
simde_uint16x8_t value = simde_vld1q_u16(cursor);
simde_uint16x8_t mask = simde_vcgeq_u16(value, charactersVector);
if (simde_vget_lane_u64(simde_vreinterpret_u64_u8(simde_vmovn_u16(mask)), 0)) {
simde_uint16x8_t ranked = simde_vornq_u16(indexMask, mask);
uint16_t index = simde_vminvq_u16(ranked);
return std::bit_cast<const UChar*>((index < length) ? cursor + index : nullptr);
}
if (length <= stride)
return nullptr;
length -= stride;
cursor += stride;
}
}
} // namespace WTF
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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