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130 lines
4.5 KiB
C
130 lines
4.5 KiB
C
/*
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* Loongson MMI optimizations for libjpeg-turbo
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*
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* Copyright (C) 2016-2017, Loongson Technology Corporation Limited, BeiJing.
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* All Rights Reserved.
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* Authors: ZhuChen <zhuchen@loongson.cn>
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* CaiWanwei <caiwanwei@loongson.cn>
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* SunZhangzhi <sunzhangzhi-cq@loongson.cn>
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* Copyright (C) 2018, D. R. Commander. All Rights Reserved.
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*
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* Based on the x86 SIMD extension for IJG JPEG library
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* Copyright (C) 1999-2006, MIYASAKA Masaru.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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/* INTEGER QUANTIZATION AND SAMPLE CONVERSION */
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#include "jsimd_mmi.h"
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#define DO_QUANT() { \
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mm2 = _mm_load_si64((__m64 *)&workspace[0]); \
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mm3 = _mm_load_si64((__m64 *)&workspace[4]); \
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\
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mm0 = mm2; \
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mm1 = mm3; \
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\
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mm2 = _mm_srai_pi16(mm2, (WORD_BIT - 1)); /* -1 if value < 0, */ \
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/* 0 otherwise */ \
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mm3 = _mm_srai_pi16(mm3, (WORD_BIT - 1)); \
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\
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mm0 = _mm_xor_si64(mm0, mm2); /* val = -val */ \
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mm1 = _mm_xor_si64(mm1, mm3); \
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mm0 = _mm_sub_pi16(mm0, mm2); \
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mm1 = _mm_sub_pi16(mm1, mm3); \
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\
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corr0 = _mm_load_si64((__m64 *)&divisors[DCTSIZE2 * 1]); /* correction */ \
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corr1 = _mm_load_si64((__m64 *)&divisors[DCTSIZE2 * 1 + 4]); \
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\
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mm0 = _mm_add_pi16(mm0, corr0); /* correction + roundfactor */ \
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mm1 = _mm_add_pi16(mm1, corr1); \
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\
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mm4 = mm0; \
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mm5 = mm1; \
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\
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recip0 = _mm_load_si64((__m64 *)&divisors[DCTSIZE2 * 0]); /* reciprocal */ \
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recip1 = _mm_load_si64((__m64 *)&divisors[DCTSIZE2 * 0 + 4]); \
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\
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mm0 = _mm_mulhi_pi16(mm0, recip0); \
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mm1 = _mm_mulhi_pi16(mm1, recip1); \
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\
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mm0 = _mm_add_pi16(mm0, mm4); /* reciprocal is always negative */ \
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mm1 = _mm_add_pi16(mm1, mm5); /* (MSB=1), so we always need to add the */ \
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/* initial value (input value is never */ \
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/* negative as we inverted it at the */ \
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/* start of this routine) */ \
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\
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scale0 = _mm_load_si64((__m64 *)&divisors[DCTSIZE2 * 2]); /* scale */ \
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scale1 = _mm_load_si64((__m64 *)&divisors[DCTSIZE2 * 2 + 4]); \
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\
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mm6 = scale0; \
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mm7 = scale1; \
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mm4 = mm0; \
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mm5 = mm1; \
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\
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mm0 = _mm_mulhi_pi16(mm0, mm6); \
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mm1 = _mm_mulhi_pi16(mm1, mm7); \
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\
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mm6 = _mm_srai_pi16(mm6, (WORD_BIT - 1)); /* determine if scale... */ \
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/* is negative */ \
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mm7 = _mm_srai_pi16(mm7, (WORD_BIT - 1)); \
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\
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mm6 = _mm_and_si64(mm6, mm4); /* and add input if it is */ \
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mm7 = _mm_and_si64(mm7, mm5); \
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mm0 = _mm_add_pi16(mm0, mm6); \
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mm1 = _mm_add_pi16(mm1, mm7); \
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\
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mm4 = _mm_srai_pi16(mm4, (WORD_BIT - 1)); /* then check if... */ \
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mm5 = _mm_srai_pi16(mm5, (WORD_BIT - 1)); /* negative input */ \
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\
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mm4 = _mm_and_si64(mm4, scale0); /* and add scale if it is */ \
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mm5 = _mm_and_si64(mm5, scale1); \
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mm0 = _mm_add_pi16(mm0, mm4); \
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mm1 = _mm_add_pi16(mm1, mm5); \
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\
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mm0 = _mm_xor_si64(mm0, mm2); /* val = -val */ \
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mm1 = _mm_xor_si64(mm1, mm3); \
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mm0 = _mm_sub_pi16(mm0, mm2); \
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mm1 = _mm_sub_pi16(mm1, mm3); \
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\
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_mm_store_si64((__m64 *)&output_ptr[0], mm0); \
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_mm_store_si64((__m64 *)&output_ptr[4], mm1); \
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\
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workspace += DCTSIZE; \
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divisors += DCTSIZE; \
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output_ptr += DCTSIZE; \
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}
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void jsimd_quantize_mmi(JCOEFPTR coef_block, DCTELEM *divisors,
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DCTELEM *workspace)
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{
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JCOEFPTR output_ptr = coef_block;
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__m64 mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7;
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__m64 corr0, corr1, recip0, recip1, scale0, scale1;
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DO_QUANT()
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DO_QUANT()
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DO_QUANT()
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DO_QUANT()
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DO_QUANT()
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DO_QUANT()
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DO_QUANT()
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DO_QUANT()
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}
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