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-rw-r--r--media/libjpeg/simd/jcsample-altivec.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/media/libjpeg/simd/jcsample-altivec.c b/media/libjpeg/simd/jcsample-altivec.c
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+/*
+ * AltiVec optimizations for libjpeg-turbo
+ *
+ * Copyright (C) 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.
+ */
+
+/* CHROMA DOWNSAMPLING */
+
+#include "jsimd_altivec.h"
+#include "jcsample.h"
+
+
+void
+jsimd_h2v1_downsample_altivec (JDIMENSION image_width, int max_v_samp_factor,
+ JDIMENSION v_samp_factor,
+ JDIMENSION width_blocks,
+ JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+ int outrow, outcol;
+ JDIMENSION output_cols = width_blocks * DCTSIZE;
+ JSAMPROW inptr, outptr;
+
+ __vector unsigned char this0, next0, out;
+ __vector unsigned short this0e, this0o, next0e, next0o, outl, outh;
+
+ /* Constants */
+ __vector unsigned short pw_bias = { __4X2(0, 1) },
+ pw_one = { __8X(1) };
+ __vector unsigned char even_odd_index =
+ {0,2,4,6,8,10,12,14,1,3,5,7,9,11,13,15},
+ pb_zero = { __16X(0) };
+
+ expand_right_edge(input_data, max_v_samp_factor, image_width,
+ output_cols * 2);
+
+ for (outrow = 0; outrow < v_samp_factor; outrow++) {
+ outptr = output_data[outrow];
+ inptr = input_data[outrow];
+
+ for (outcol = output_cols; outcol > 0;
+ outcol -= 16, inptr += 32, outptr += 16) {
+
+ this0 = vec_ld(0, inptr);
+ this0 = vec_perm(this0, this0, even_odd_index);
+ this0e = (__vector unsigned short)VEC_UNPACKHU(this0);
+ this0o = (__vector unsigned short)VEC_UNPACKLU(this0);
+ outl = vec_add(this0e, this0o);
+ outl = vec_add(outl, pw_bias);
+ outl = vec_sr(outl, pw_one);
+
+ if (outcol > 8) {
+ next0 = vec_ld(16, inptr);
+ next0 = vec_perm(next0, next0, even_odd_index);
+ next0e = (__vector unsigned short)VEC_UNPACKHU(next0);
+ next0o = (__vector unsigned short)VEC_UNPACKLU(next0);
+ outh = vec_add(next0e, next0o);
+ outh = vec_add(outh, pw_bias);
+ outh = vec_sr(outh, pw_one);
+ } else
+ outh = vec_splat_u16(0);
+
+ out = vec_pack(outl, outh);
+ vec_st(out, 0, outptr);
+ }
+ }
+}
+
+
+void
+jsimd_h2v2_downsample_altivec (JDIMENSION image_width, int max_v_samp_factor,
+ JDIMENSION v_samp_factor,
+ JDIMENSION width_blocks,
+ JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+ int inrow, outrow, outcol;
+ JDIMENSION output_cols = width_blocks * DCTSIZE;
+ JSAMPROW inptr0, inptr1, outptr;
+
+ __vector unsigned char this0, next0, this1, next1, out;
+ __vector unsigned short this0e, this0o, next0e, next0o, this1e, this1o,
+ next1e, next1o, out0l, out0h, out1l, out1h, outl, outh;
+
+ /* Constants */
+ __vector unsigned short pw_bias = { __4X2(1, 2) },
+ pw_two = { __8X(2) };
+ __vector unsigned char even_odd_index =
+ { 0, 2, 4, 6, 8, 10, 12, 14, 1, 3, 5, 7, 9, 11, 13, 15 },
+ pb_zero = { __16X(0) };
+
+ expand_right_edge(input_data, max_v_samp_factor, image_width,
+ output_cols * 2);
+
+ for (inrow = 0, outrow = 0; outrow < v_samp_factor;
+ inrow += 2, outrow++) {
+
+ inptr0 = input_data[inrow];
+ inptr1 = input_data[inrow + 1];
+ outptr = output_data[outrow];
+
+ for (outcol = output_cols; outcol > 0;
+ outcol -= 16, inptr0 += 32, inptr1 += 32, outptr += 16) {
+
+ this0 = vec_ld(0, inptr0);
+ this0 = vec_perm(this0, this0, even_odd_index);
+ this0e = (__vector unsigned short)VEC_UNPACKHU(this0);
+ this0o = (__vector unsigned short)VEC_UNPACKLU(this0);
+ out0l = vec_add(this0e, this0o);
+
+ this1 = vec_ld(0, inptr1);
+ this1 = vec_perm(this1, this1, even_odd_index);
+ this1e = (__vector unsigned short)VEC_UNPACKHU(this1);
+ this1o = (__vector unsigned short)VEC_UNPACKLU(this1);
+ out1l = vec_add(this1e, this1o);
+
+ outl = vec_add(out0l, out1l);
+ outl = vec_add(outl, pw_bias);
+ outl = vec_sr(outl, pw_two);
+
+ if (outcol > 8) {
+ next0 = vec_ld(16, inptr0);
+ next0 = vec_perm(next0, next0, even_odd_index);
+ next0e = (__vector unsigned short)VEC_UNPACKHU(next0);
+ next0o = (__vector unsigned short)VEC_UNPACKLU(next0);
+ out0h = vec_add(next0e, next0o);
+
+ next1 = vec_ld(16, inptr1);
+ next1 = vec_perm(next1, next1, even_odd_index);
+ next1e = (__vector unsigned short)VEC_UNPACKHU(next1);
+ next1o = (__vector unsigned short)VEC_UNPACKLU(next1);
+ out1h = vec_add(next1e, next1o);
+
+ outh = vec_add(out0h, out1h);
+ outh = vec_add(outh, pw_bias);
+ outh = vec_sr(outh, pw_two);
+ } else
+ outh = vec_splat_u16(0);
+
+ out = vec_pack(outl, outh);
+ vec_st(out, 0, outptr);
+ }
+ }
+}