diff options
Diffstat (limited to 'media/libjpeg/simd/powerpc/jidctfst-altivec.c')
| -rw-r--r-- | media/libjpeg/simd/powerpc/jidctfst-altivec.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/media/libjpeg/simd/powerpc/jidctfst-altivec.c b/media/libjpeg/simd/powerpc/jidctfst-altivec.c new file mode 100644 index 0000000000..456c6c6174 --- /dev/null +++ b/media/libjpeg/simd/powerpc/jidctfst-altivec.c @@ -0,0 +1,255 @@ +/* + * AltiVec optimizations for libjpeg-turbo + * + * Copyright (C) 2014-2015, D. R. Commander. All Rights Reserved. + * + * This software is provided 'as-is', without any express or implied + * warranty. In no event will the authors be held liable for any damages + * arising from the use of this software. + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute it + * freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. If you use this software + * in a product, an acknowledgment in the product documentation would be + * appreciated but is not required. + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * 3. This notice may not be removed or altered from any source distribution. + */ + +/* FAST INTEGER INVERSE DCT + * + * This is similar to the SSE2 implementation, except that we left-shift the + * constants by 1 less bit (the -1 in CONST_SHIFT.) This is because + * vec_madds(arg1, arg2, arg3) generates the 16-bit saturated sum of: + * the elements in arg3 + the most significant 17 bits of + * (the elements in arg1 * the elements in arg2). + */ + +#include "jsimd_altivec.h" + + +#define F_1_082 277 /* FIX(1.082392200) */ +#define F_1_414 362 /* FIX(1.414213562) */ +#define F_1_847 473 /* FIX(1.847759065) */ +#define F_2_613 669 /* FIX(2.613125930) */ +#define F_1_613 (F_2_613 - 256) /* FIX(2.613125930) - FIX(1) */ + +#define CONST_BITS 8 +#define PASS1_BITS 2 +#define PRE_MULTIPLY_SCALE_BITS 2 +#define CONST_SHIFT (16 - PRE_MULTIPLY_SCALE_BITS - CONST_BITS - 1) + + +#define DO_IDCT(in) { \ + /* Even part */ \ + \ + tmp10 = vec_add(in##0, in##4); \ + tmp11 = vec_sub(in##0, in##4); \ + tmp13 = vec_add(in##2, in##6); \ + \ + tmp12 = vec_sub(in##2, in##6); \ + tmp12 = vec_sl(tmp12, pre_multiply_scale_bits); \ + tmp12 = vec_madds(tmp12, pw_F1414, pw_zero); \ + tmp12 = vec_sub(tmp12, tmp13); \ + \ + tmp0 = vec_add(tmp10, tmp13); \ + tmp3 = vec_sub(tmp10, tmp13); \ + tmp1 = vec_add(tmp11, tmp12); \ + tmp2 = vec_sub(tmp11, tmp12); \ + \ + /* Odd part */ \ + \ + z13 = vec_add(in##5, in##3); \ + z10 = vec_sub(in##5, in##3); \ + z10s = vec_sl(z10, pre_multiply_scale_bits); \ + z11 = vec_add(in##1, in##7); \ + z12s = vec_sub(in##1, in##7); \ + z12s = vec_sl(z12s, pre_multiply_scale_bits); \ + \ + tmp11 = vec_sub(z11, z13); \ + tmp11 = vec_sl(tmp11, pre_multiply_scale_bits); \ + tmp11 = vec_madds(tmp11, pw_F1414, pw_zero); \ + \ + tmp7 = vec_add(z11, z13); \ + \ + /* To avoid overflow... \ + * \ + * (Original) \ + * tmp12 = -2.613125930 * z10 + z5; \ + * \ + * (This implementation) \ + * tmp12 = (-1.613125930 - 1) * z10 + z5; \ + * = -1.613125930 * z10 - z10 + z5; \ + */ \ + \ + z5 = vec_add(z10s, z12s); \ + z5 = vec_madds(z5, pw_F1847, pw_zero); \ + \ + tmp10 = vec_madds(z12s, pw_F1082, pw_zero); \ + tmp10 = vec_sub(tmp10, z5); \ + tmp12 = vec_madds(z10s, pw_MF1613, z5); \ + tmp12 = vec_sub(tmp12, z10); \ + \ + tmp6 = vec_sub(tmp12, tmp7); \ + tmp5 = vec_sub(tmp11, tmp6); \ + tmp4 = vec_add(tmp10, tmp5); \ + \ + out0 = vec_add(tmp0, tmp7); \ + out1 = vec_add(tmp1, tmp6); \ + out2 = vec_add(tmp2, tmp5); \ + out3 = vec_sub(tmp3, tmp4); \ + out4 = vec_add(tmp3, tmp4); \ + out5 = vec_sub(tmp2, tmp5); \ + out6 = vec_sub(tmp1, tmp6); \ + out7 = vec_sub(tmp0, tmp7); \ +} + + +void jsimd_idct_ifast_altivec(void *dct_table_, JCOEFPTR coef_block, + JSAMPARRAY output_buf, JDIMENSION output_col) +{ + short *dct_table = (short *)dct_table_; + int *outptr; + + __vector short row0, row1, row2, row3, row4, row5, row6, row7, + col0, col1, col2, col3, col4, col5, col6, col7, + quant0, quant1, quant2, quant3, quant4, quant5, quant6, quant7, + tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp10, tmp11, tmp12, tmp13, + z5, z10, z10s, z11, z12s, z13, + out0, out1, out2, out3, out4, out5, out6, out7; + __vector signed char outb; + + /* Constants */ + __vector short pw_zero = { __8X(0) }, + pw_F1414 = { __8X(F_1_414 << CONST_SHIFT) }, + pw_F1847 = { __8X(F_1_847 << CONST_SHIFT) }, + pw_MF1613 = { __8X(-F_1_613 << CONST_SHIFT) }, + pw_F1082 = { __8X(F_1_082 << CONST_SHIFT) }; + __vector unsigned short + pre_multiply_scale_bits = { __8X(PRE_MULTIPLY_SCALE_BITS) }, + pass1_bits3 = { __8X(PASS1_BITS + 3) }; + __vector signed char pb_centerjsamp = { __16X(CENTERJSAMPLE) }; + + /* Pass 1: process columns */ + + col0 = vec_ld(0, coef_block); + col1 = vec_ld(16, coef_block); + col2 = vec_ld(32, coef_block); + col3 = vec_ld(48, coef_block); + col4 = vec_ld(64, coef_block); + col5 = vec_ld(80, coef_block); + col6 = vec_ld(96, coef_block); + col7 = vec_ld(112, coef_block); + + tmp1 = vec_or(col1, col2); + tmp2 = vec_or(col3, col4); + tmp1 = vec_or(tmp1, tmp2); + tmp3 = vec_or(col5, col6); + tmp3 = vec_or(tmp3, col7); + tmp1 = vec_or(tmp1, tmp3); + + quant0 = vec_ld(0, dct_table); + col0 = vec_mladd(col0, quant0, pw_zero); + + if (vec_all_eq(tmp1, pw_zero)) { + /* AC terms all zero */ + + row0 = vec_splat(col0, 0); + row1 = vec_splat(col0, 1); + row2 = vec_splat(col0, 2); + row3 = vec_splat(col0, 3); + row4 = vec_splat(col0, 4); + row5 = vec_splat(col0, 5); + row6 = vec_splat(col0, 6); + row7 = vec_splat(col0, 7); + + } else { + + quant1 = vec_ld(16, dct_table); + quant2 = vec_ld(32, dct_table); + quant3 = vec_ld(48, dct_table); + quant4 = vec_ld(64, dct_table); + quant5 = vec_ld(80, dct_table); + quant6 = vec_ld(96, dct_table); + quant7 = vec_ld(112, dct_table); + + col1 = vec_mladd(col1, quant1, pw_zero); + col2 = vec_mladd(col2, quant2, pw_zero); + col3 = vec_mladd(col3, quant3, pw_zero); + col4 = vec_mladd(col4, quant4, pw_zero); + col5 = vec_mladd(col5, quant5, pw_zero); + col6 = vec_mladd(col6, quant6, pw_zero); + col7 = vec_mladd(col7, quant7, pw_zero); + + DO_IDCT(col); + + TRANSPOSE(out, row); + } + + /* Pass 2: process rows */ + + DO_IDCT(row); + + out0 = vec_sra(out0, pass1_bits3); + out1 = vec_sra(out1, pass1_bits3); + out2 = vec_sra(out2, pass1_bits3); + out3 = vec_sra(out3, pass1_bits3); + out4 = vec_sra(out4, pass1_bits3); + out5 = vec_sra(out5, pass1_bits3); + out6 = vec_sra(out6, pass1_bits3); + out7 = vec_sra(out7, pass1_bits3); + + TRANSPOSE(out, col); + + outb = vec_packs(col0, col0); + outb = vec_add(outb, pb_centerjsamp); + outptr = (int *)(output_buf[0] + output_col); + vec_ste((__vector int)outb, 0, outptr); + vec_ste((__vector int)outb, 4, outptr); + + outb = vec_packs(col1, col1); + outb = vec_add(outb, pb_centerjsamp); + outptr = (int *)(output_buf[1] + output_col); + vec_ste((__vector int)outb, 0, outptr); + vec_ste((__vector int)outb, 4, outptr); + + outb = vec_packs(col2, col2); + outb = vec_add(outb, pb_centerjsamp); + outptr = (int *)(output_buf[2] + output_col); + vec_ste((__vector int)outb, 0, outptr); + vec_ste((__vector int)outb, 4, outptr); + + outb = vec_packs(col3, col3); + outb = vec_add(outb, pb_centerjsamp); + outptr = (int *)(output_buf[3] + output_col); + vec_ste((__vector int)outb, 0, outptr); + vec_ste((__vector int)outb, 4, outptr); + + outb = vec_packs(col4, col4); + outb = vec_add(outb, pb_centerjsamp); + outptr = (int *)(output_buf[4] + output_col); + vec_ste((__vector int)outb, 0, outptr); + vec_ste((__vector int)outb, 4, outptr); + + outb = vec_packs(col5, col5); + outb = vec_add(outb, pb_centerjsamp); + outptr = (int *)(output_buf[5] + output_col); + vec_ste((__vector int)outb, 0, outptr); + vec_ste((__vector int)outb, 4, outptr); + + outb = vec_packs(col6, col6); + outb = vec_add(outb, pb_centerjsamp); + outptr = (int *)(output_buf[6] + output_col); + vec_ste((__vector int)outb, 0, outptr); + vec_ste((__vector int)outb, 4, outptr); + + outb = vec_packs(col7, col7); + outb = vec_add(outb, pb_centerjsamp); + outptr = (int *)(output_buf[7] + output_col); + vec_ste((__vector int)outb, 0, outptr); + vec_ste((__vector int)outb, 4, outptr); +} |