diff options
Diffstat (limited to 'intel/filter_sse2_intrinsics.c')
| -rw-r--r-- | intel/filter_sse2_intrinsics.c | 51 |
1 files changed, 18 insertions, 33 deletions
diff --git a/intel/filter_sse2_intrinsics.c b/intel/filter_sse2_intrinsics.c index 5e8553fbb..d3c0fe9e2 100644 --- a/intel/filter_sse2_intrinsics.c +++ b/intel/filter_sse2_intrinsics.c @@ -1,12 +1,11 @@ /* filter_sse2_intrinsics.c - SSE2 optimized filter functions * + * Copyright (c) 2018 Cosmin Truta * Copyright (c) 2016-2017 Glenn Randers-Pehrson * Written by Mike Klein and Matt Sarett * Derived from arm/filter_neon_intrinsics.c * - * Last changed in libpng 1.6.31 [July 27, 2017] - * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer * and license in png.h @@ -29,39 +28,25 @@ */ static __m128i load4(const void* p) { - return _mm_cvtsi32_si128(*(const int*)p); + int tmp; + memcpy(&tmp, p, sizeof(tmp)); + return _mm_cvtsi32_si128(tmp); } static void store4(void* p, __m128i v) { - *(int*)p = _mm_cvtsi128_si32(v); + int tmp = _mm_cvtsi128_si32(v); + memcpy(p, &tmp, sizeof(int)); } static __m128i load3(const void* p) { - /* We'll load 2 bytes, then 1 byte, - * then mask them together, and finally load into SSE. - */ - const png_uint_16* p01 = (png_const_uint_16p)p; - const png_byte* p2 = (const png_byte*)(p01+1); - - png_uint_32 v012 = (png_uint_32)(*p01) - | (png_uint_32)(*p2) << 16; - return load4(&v012); + png_uint_32 tmp = 0; + memcpy(&tmp, p, 3); + return _mm_cvtsi32_si128(tmp); } static void store3(void* p, __m128i v) { - /* We'll pull from SSE as a 32-bit int, then write - * its bottom two bytes, then its third byte. - */ - png_uint_32 v012; - png_uint_16* p01; - png_byte* p2; - - store4(&v012, v); - - p01 = (png_uint_16p)p; - p2 = (png_byte*)(p01+1); - *p01 = (png_uint_16)v012; - *p2 = (png_byte)(v012 >> 16); + int tmp = _mm_cvtsi128_si32(v); + memcpy(p, &tmp, 3); } void png_read_filter_row_sub3_sse2(png_row_infop row_info, png_bytep row, @@ -71,7 +56,7 @@ void png_read_filter_row_sub3_sse2(png_row_infop row_info, png_bytep row, * There is no pixel to the left of the first pixel. It's encoded directly. * That works with our main loop if we just say that left pixel was zero. */ - png_size_t rb; + size_t rb; __m128i a, d = _mm_setzero_si128(); @@ -104,7 +89,7 @@ void png_read_filter_row_sub4_sse2(png_row_infop row_info, png_bytep row, * There is no pixel to the left of the first pixel. It's encoded directly. * That works with our main loop if we just say that left pixel was zero. */ - png_size_t rb; + size_t rb; __m128i a, d = _mm_setzero_si128(); @@ -131,7 +116,7 @@ void png_read_filter_row_avg3_sse2(png_row_infop row_info, png_bytep row, * perfectly with our loop if we make sure a starts at zero. */ - png_size_t rb; + size_t rb; const __m128i zero = _mm_setzero_si128(); @@ -185,7 +170,7 @@ void png_read_filter_row_avg4_sse2(png_row_infop row_info, png_bytep row, * predicted to be half of the pixel above it. So again, this works * perfectly with our loop if we make sure a starts at zero. */ - png_size_t rb; + size_t rb; const __m128i zero = _mm_setzero_si128(); __m128i b; __m128i a, d = zero; @@ -257,7 +242,7 @@ void png_read_filter_row_paeth3_sse2(png_row_infop row_info, png_bytep row, * Here we zero b and d, which become c and a respectively at the start of * the loop. */ - png_size_t rb; + size_t rb; const __m128i zero = _mm_setzero_si128(); __m128i c, b = zero, a, d = zero; @@ -274,7 +259,7 @@ void png_read_filter_row_paeth3_sse2(png_row_infop row_info, png_bytep row, a = d; d = _mm_unpacklo_epi8(load4(row ), zero); /* (p-a) == (a+b-c - a) == (b-c) */ - + pa = _mm_sub_epi16(b,c); /* (p-b) == (a+b-c - b) == (a-c) */ @@ -356,7 +341,7 @@ void png_read_filter_row_paeth4_sse2(png_row_infop row_info, png_bytep row, * Here we zero b and d, which become c and a respectively at the start of * the loop. */ - png_size_t rb; + size_t rb; const __m128i zero = _mm_setzero_si128(); __m128i pa,pb,pc,smallest,nearest; __m128i c, b = zero, |