michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: // This file should only be compiled if you're on x86 or x86_64.  Additionally,
michael@0: // you'll need to compile this file with -msse2 if you're using gcc.
michael@0: 
michael@0: #include <emmintrin.h>
michael@0: #include "nscore.h"
michael@0: #include "nsAlgorithm.h"
michael@0: #include "nsTextFragmentImpl.h"
michael@0: #include <algorithm>
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace SSE2 {
michael@0: 
michael@0: static inline bool
michael@0: is_zero (__m128i x)
michael@0: {
michael@0:   return
michael@0:     _mm_movemask_epi8(_mm_cmpeq_epi8(x, _mm_setzero_si128())) == 0xffff;
michael@0: }
michael@0: 
michael@0: int32_t
michael@0: FirstNon8Bit(const char16_t *str, const char16_t *end)
michael@0: {
michael@0:   const uint32_t numUnicharsPerVector = 8;
michael@0:   typedef Non8BitParameters<sizeof(size_t)> p;
michael@0:   const size_t mask = p::mask();
michael@0:   const uint32_t numUnicharsPerWord = p::numUnicharsPerWord();
michael@0:   const int32_t len = end - str;
michael@0:   int32_t i = 0;
michael@0: 
michael@0:   // Align ourselves to a 16-byte boundary, as required by _mm_load_si128
michael@0:   // (i.e. MOVDQA).
michael@0:   int32_t alignLen =
michael@0:     std::min(len, int32_t(((-NS_PTR_TO_INT32(str)) & 0xf) / sizeof(char16_t)));
michael@0:   for (; i < alignLen; i++) {
michael@0:     if (str[i] > 255)
michael@0:       return i;
michael@0:   }
michael@0: 
michael@0:   // Check one XMM register (16 bytes) at a time.
michael@0:   const int32_t vectWalkEnd = ((len - i) / numUnicharsPerVector) * numUnicharsPerVector;
michael@0:   const uint16_t shortMask = 0xff00;
michael@0:   __m128i vectmask = _mm_set1_epi16(static_cast<int16_t>(shortMask));
michael@0:   for(; i < vectWalkEnd; i += numUnicharsPerVector) {
michael@0:     const __m128i vect = *reinterpret_cast<const __m128i*>(str + i);
michael@0:     if (!is_zero(_mm_and_si128(vect, vectmask)))
michael@0:       return i;
michael@0:   }
michael@0: 
michael@0:   // Check one word at a time.
michael@0:   const int32_t wordWalkEnd = ((len - i) / numUnicharsPerWord) * numUnicharsPerWord;
michael@0:   for(; i < wordWalkEnd; i += numUnicharsPerWord) {
michael@0:     const size_t word = *reinterpret_cast<const size_t*>(str + i);
michael@0:     if (word & mask)
michael@0:       return i;
michael@0:   }
michael@0: 
michael@0:   // Take care of the remainder one character at a time.
michael@0:   for (; i < len; i++) {
michael@0:     if (str[i] > 255) {
michael@0:       return i;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   return -1;
michael@0: }
michael@0: 
michael@0: } // namespace SSE2
michael@0: } // namespace mozilla