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+/*
+ * 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.
+ */
+
+/* INTEGER QUANTIZATION AND SAMPLE CONVERSION */
+
+#include "jsimd_altivec.h"
+
+
+/* NOTE: The address will either be aligned or offset by 8 bytes, so we can
+ * always get the data we want by using a single vector load (although we may
+ * have to permute the result.)
+ */
+#if __BIG_ENDIAN__
+
+#define LOAD_ROW(row) { \
+ elemptr = sample_data[row] + start_col; \
+ in##row = vec_ld(0, elemptr); \
+ if ((size_t)elemptr & 15) \
+ in##row = vec_perm(in##row, in##row, vec_lvsl(0, elemptr)); \
+}
+
+#else
+
+#define LOAD_ROW(row) { \
+ elemptr = sample_data[row] + start_col; \
+ in##row = vec_vsx_ld(0, elemptr); \
+}
+
+#endif
+
+
+void jsimd_convsamp_altivec(JSAMPARRAY sample_data, JDIMENSION start_col,
+ DCTELEM *workspace)
+{
+ JSAMPROW elemptr;
+
+ __vector unsigned char in0, in1, in2, in3, in4, in5, in6, in7;
+ __vector short out0, out1, out2, out3, out4, out5, out6, out7;
+
+ /* Constants */
+ __vector short pw_centerjsamp = { __8X(CENTERJSAMPLE) };
+ __vector unsigned char pb_zero = { __16X(0) };
+
+ LOAD_ROW(0);
+ LOAD_ROW(1);
+ LOAD_ROW(2);
+ LOAD_ROW(3);
+ LOAD_ROW(4);
+ LOAD_ROW(5);
+ LOAD_ROW(6);
+ LOAD_ROW(7);
+
+ out0 = (__vector short)VEC_UNPACKHU(in0);
+ out1 = (__vector short)VEC_UNPACKHU(in1);
+ out2 = (__vector short)VEC_UNPACKHU(in2);
+ out3 = (__vector short)VEC_UNPACKHU(in3);
+ out4 = (__vector short)VEC_UNPACKHU(in4);
+ out5 = (__vector short)VEC_UNPACKHU(in5);
+ out6 = (__vector short)VEC_UNPACKHU(in6);
+ out7 = (__vector short)VEC_UNPACKHU(in7);
+
+ out0 = vec_sub(out0, pw_centerjsamp);
+ out1 = vec_sub(out1, pw_centerjsamp);
+ out2 = vec_sub(out2, pw_centerjsamp);
+ out3 = vec_sub(out3, pw_centerjsamp);
+ out4 = vec_sub(out4, pw_centerjsamp);
+ out5 = vec_sub(out5, pw_centerjsamp);
+ out6 = vec_sub(out6, pw_centerjsamp);
+ out7 = vec_sub(out7, pw_centerjsamp);
+
+ vec_st(out0, 0, workspace);
+ vec_st(out1, 16, workspace);
+ vec_st(out2, 32, workspace);
+ vec_st(out3, 48, workspace);
+ vec_st(out4, 64, workspace);
+ vec_st(out5, 80, workspace);
+ vec_st(out6, 96, workspace);
+ vec_st(out7, 112, workspace);
+}
+
+
+#define WORD_BIT 16
+
+/* There is no AltiVec 16-bit unsigned multiply instruction, hence this.
+ We basically need an unsigned equivalent of vec_madds(). */
+
+#define MULTIPLY(vs0, vs1, out) { \
+ tmpe = vec_mule((__vector unsigned short)vs0, \
+ (__vector unsigned short)vs1); \
+ tmpo = vec_mulo((__vector unsigned short)vs0, \
+ (__vector unsigned short)vs1); \
+ out = (__vector short)vec_perm((__vector unsigned short)tmpe, \
+ (__vector unsigned short)tmpo, \
+ shift_pack_index); \
+}
+
+void jsimd_quantize_altivec(JCOEFPTR coef_block, DCTELEM *divisors,
+ DCTELEM *workspace)
+{
+ __vector short row0, row1, row2, row3, row4, row5, row6, row7,
+ row0s, row1s, row2s, row3s, row4s, row5s, row6s, row7s,
+ corr0, corr1, corr2, corr3, corr4, corr5, corr6, corr7,
+ recip0, recip1, recip2, recip3, recip4, recip5, recip6, recip7,
+ scale0, scale1, scale2, scale3, scale4, scale5, scale6, scale7;
+ __vector unsigned int tmpe, tmpo;
+
+ /* Constants */
+ __vector unsigned short pw_word_bit_m1 = { __8X(WORD_BIT - 1) };
+#if __BIG_ENDIAN__
+ __vector unsigned char shift_pack_index =
+ { 0, 1, 16, 17, 4, 5, 20, 21, 8, 9, 24, 25, 12, 13, 28, 29 };
+#else
+ __vector unsigned char shift_pack_index =
+ { 2, 3, 18, 19, 6, 7, 22, 23, 10, 11, 26, 27, 14, 15, 30, 31 };
+#endif
+
+ row0 = vec_ld(0, workspace);
+ row1 = vec_ld(16, workspace);
+ row2 = vec_ld(32, workspace);
+ row3 = vec_ld(48, workspace);
+ row4 = vec_ld(64, workspace);
+ row5 = vec_ld(80, workspace);
+ row6 = vec_ld(96, workspace);
+ row7 = vec_ld(112, workspace);
+
+ /* Branch-less absolute value */
+ row0s = vec_sra(row0, pw_word_bit_m1);
+ row1s = vec_sra(row1, pw_word_bit_m1);
+ row2s = vec_sra(row2, pw_word_bit_m1);
+ row3s = vec_sra(row3, pw_word_bit_m1);
+ row4s = vec_sra(row4, pw_word_bit_m1);
+ row5s = vec_sra(row5, pw_word_bit_m1);
+ row6s = vec_sra(row6, pw_word_bit_m1);
+ row7s = vec_sra(row7, pw_word_bit_m1);
+ row0 = vec_xor(row0, row0s);
+ row1 = vec_xor(row1, row1s);
+ row2 = vec_xor(row2, row2s);
+ row3 = vec_xor(row3, row3s);
+ row4 = vec_xor(row4, row4s);
+ row5 = vec_xor(row5, row5s);
+ row6 = vec_xor(row6, row6s);
+ row7 = vec_xor(row7, row7s);
+ row0 = vec_sub(row0, row0s);
+ row1 = vec_sub(row1, row1s);
+ row2 = vec_sub(row2, row2s);
+ row3 = vec_sub(row3, row3s);
+ row4 = vec_sub(row4, row4s);
+ row5 = vec_sub(row5, row5s);
+ row6 = vec_sub(row6, row6s);
+ row7 = vec_sub(row7, row7s);
+
+ corr0 = vec_ld(DCTSIZE2 * 2, divisors);
+ corr1 = vec_ld(DCTSIZE2 * 2 + 16, divisors);
+ corr2 = vec_ld(DCTSIZE2 * 2 + 32, divisors);
+ corr3 = vec_ld(DCTSIZE2 * 2 + 48, divisors);
+ corr4 = vec_ld(DCTSIZE2 * 2 + 64, divisors);
+ corr5 = vec_ld(DCTSIZE2 * 2 + 80, divisors);
+ corr6 = vec_ld(DCTSIZE2 * 2 + 96, divisors);
+ corr7 = vec_ld(DCTSIZE2 * 2 + 112, divisors);
+
+ row0 = vec_add(row0, corr0);
+ row1 = vec_add(row1, corr1);
+ row2 = vec_add(row2, corr2);
+ row3 = vec_add(row3, corr3);
+ row4 = vec_add(row4, corr4);
+ row5 = vec_add(row5, corr5);
+ row6 = vec_add(row6, corr6);
+ row7 = vec_add(row7, corr7);
+
+ recip0 = vec_ld(0, divisors);
+ recip1 = vec_ld(16, divisors);
+ recip2 = vec_ld(32, divisors);
+ recip3 = vec_ld(48, divisors);
+ recip4 = vec_ld(64, divisors);
+ recip5 = vec_ld(80, divisors);
+ recip6 = vec_ld(96, divisors);
+ recip7 = vec_ld(112, divisors);
+
+ MULTIPLY(row0, recip0, row0);
+ MULTIPLY(row1, recip1, row1);
+ MULTIPLY(row2, recip2, row2);
+ MULTIPLY(row3, recip3, row3);
+ MULTIPLY(row4, recip4, row4);
+ MULTIPLY(row5, recip5, row5);
+ MULTIPLY(row6, recip6, row6);
+ MULTIPLY(row7, recip7, row7);
+
+ scale0 = vec_ld(DCTSIZE2 * 4, divisors);
+ scale1 = vec_ld(DCTSIZE2 * 4 + 16, divisors);
+ scale2 = vec_ld(DCTSIZE2 * 4 + 32, divisors);
+ scale3 = vec_ld(DCTSIZE2 * 4 + 48, divisors);
+ scale4 = vec_ld(DCTSIZE2 * 4 + 64, divisors);
+ scale5 = vec_ld(DCTSIZE2 * 4 + 80, divisors);
+ scale6 = vec_ld(DCTSIZE2 * 4 + 96, divisors);
+ scale7 = vec_ld(DCTSIZE2 * 4 + 112, divisors);
+
+ MULTIPLY(row0, scale0, row0);
+ MULTIPLY(row1, scale1, row1);
+ MULTIPLY(row2, scale2, row2);
+ MULTIPLY(row3, scale3, row3);
+ MULTIPLY(row4, scale4, row4);
+ MULTIPLY(row5, scale5, row5);
+ MULTIPLY(row6, scale6, row6);
+ MULTIPLY(row7, scale7, row7);
+
+ row0 = vec_xor(row0, row0s);
+ row1 = vec_xor(row1, row1s);
+ row2 = vec_xor(row2, row2s);
+ row3 = vec_xor(row3, row3s);
+ row4 = vec_xor(row4, row4s);
+ row5 = vec_xor(row5, row5s);
+ row6 = vec_xor(row6, row6s);
+ row7 = vec_xor(row7, row7s);
+ row0 = vec_sub(row0, row0s);
+ row1 = vec_sub(row1, row1s);
+ row2 = vec_sub(row2, row2s);
+ row3 = vec_sub(row3, row3s);
+ row4 = vec_sub(row4, row4s);
+ row5 = vec_sub(row5, row5s);
+ row6 = vec_sub(row6, row6s);
+ row7 = vec_sub(row7, row7s);
+
+ vec_st(row0, 0, coef_block);
+ vec_st(row1, 16, coef_block);
+ vec_st(row2, 32, coef_block);
+ vec_st(row3, 48, coef_block);
+ vec_st(row4, 64, coef_block);
+ vec_st(row5, 80, coef_block);
+ vec_st(row6, 96, coef_block);
+ vec_st(row7, 112, coef_block);
+}