dsputil: Split motion estimation compare bits off into their own context

1 files changed, 767 insertions, 0 deletions

diff --git a/libavcodec/ppc/me_cmp.c b/libavcodec/ppc/me_cmp.c
new file mode 100644
index 0000000000..88c7feaa7e
--- /dev/null
+++ b/libavcodec/ppc/me_cmp.c
@@ -0,0 +1,767 @@
+/*
+ * Copyright (c) 2002 Brian Foley
+ * Copyright (c) 2002 Dieter Shirley
+ * Copyright (c) 2003-2004 Romain Dolbeau <romain@dolbeau.org>
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#if HAVE_ALTIVEC_H
+#include <altivec.h>
+#endif
+
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/ppc/cpu.h"
+#include "libavutil/ppc/types_altivec.h"
+#include "libavutil/ppc/util_altivec.h"
+#include "libavcodec/avcodec.h"
+#include "libavcodec/mpegvideo.h"
+#include "libavcodec/me_cmp.h"
+
+#if HAVE_ALTIVEC
+static int sad16_x2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                            int line_size, int h)
+{
+    int i, s = 0;
+    const vector unsigned char zero =
+        (const vector unsigned char) vec_splat_u8(0);
+    vector unsigned char perm1 = vec_lvsl(0, pix2);
+    vector unsigned char perm2 = vec_add(perm1, vec_splat_u8(1));
+    vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
+    vector signed int sumdiffs;
+
+    for (i = 0; i < h; i++) {
+        /* Read unaligned pixels into our vectors. The vectors are as follows:
+         * pix1v: pix1[0] - pix1[15]
+         * pix2v: pix2[0] - pix2[15]      pix2iv: pix2[1] - pix2[16] */
+        vector unsigned char pix1v  = vec_ld(0,  pix1);
+        vector unsigned char pix2l  = vec_ld(0,  pix2);
+        vector unsigned char pix2r  = vec_ld(16, pix2);
+        vector unsigned char pix2v  = vec_perm(pix2l, pix2r, perm1);
+        vector unsigned char pix2iv = vec_perm(pix2l, pix2r, perm2);
+
+        /* Calculate the average vector. */
+        vector unsigned char avgv = vec_avg(pix2v, pix2iv);
+
+        /* Calculate a sum of abs differences vector. */
+        vector unsigned char t5 = vec_sub(vec_max(pix1v, avgv),
+                                          vec_min(pix1v, avgv));
+
+        /* Add each 4 pixel group together and put 4 results into sad. */
+        sad = vec_sum4s(t5, sad);
+
+        pix1 += line_size;
+        pix2 += line_size;
+    }
+    /* Sum up the four partial sums, and put the result into s. */
+    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
+    sumdiffs = vec_splat(sumdiffs, 3);
+    vec_ste(sumdiffs, 0, &s);
+
+    return s;
+}
+
+static int sad16_y2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                            int line_size, int h)
+{
+    int i, s = 0;
+    const vector unsigned char zero =
+        (const vector unsigned char) vec_splat_u8(0);
+    vector unsigned char perm = vec_lvsl(0, pix2);
+    vector unsigned char pix1v, pix3v, avgv, t5;
+    vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
+    vector signed int sumdiffs;
+    uint8_t *pix3 = pix2 + line_size;
+
+    /* Due to the fact that pix3 = pix2 + line_size, the pix3 of one
+     * iteration becomes pix2 in the next iteration. We can use this
+     * fact to avoid a potentially expensive unaligned read, each
+     * time around the loop.
+     * Read unaligned pixels into our vectors. The vectors are as follows:
+     * pix2v: pix2[0] - pix2[15]
+     * Split the pixel vectors into shorts. */
+    vector unsigned char pix2l = vec_ld(0,  pix2);
+    vector unsigned char pix2r = vec_ld(15, pix2);
+    vector unsigned char pix2v = vec_perm(pix2l, pix2r, perm);
+
+    for (i = 0; i < h; i++) {
+        /* Read unaligned pixels into our vectors. The vectors are as follows:
+         * pix1v: pix1[0] - pix1[15]
+         * pix3v: pix3[0] - pix3[15] */
+        pix1v = vec_ld(0,  pix1);
+
+        pix2l = vec_ld(0,  pix3);
+        pix2r = vec_ld(15, pix3);
+        pix3v = vec_perm(pix2l, pix2r, perm);
+
+        /* Calculate the average vector. */
+        avgv = vec_avg(pix2v, pix3v);
+
+        /* Calculate a sum of abs differences vector. */
+        t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));
+
+        /* Add each 4 pixel group together and put 4 results into sad. */
+        sad = vec_sum4s(t5, sad);
+
+        pix1 += line_size;
+        pix2v = pix3v;
+        pix3 += line_size;
+    }
+
+    /* Sum up the four partial sums, and put the result into s. */
+    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
+    sumdiffs = vec_splat(sumdiffs, 3);
+    vec_ste(sumdiffs, 0, &s);
+    return s;
+}
+
+static int sad16_xy2_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                             int line_size, int h)
+{
+    int i, s = 0;
+    uint8_t *pix3 = pix2 + line_size;
+    const vector unsigned char zero =
+        (const vector unsigned char) vec_splat_u8(0);
+    const vector unsigned short two =
+        (const vector unsigned short) vec_splat_u16(2);
+    vector unsigned char avgv, t5;
+    vector unsigned char perm1 = vec_lvsl(0, pix2);
+    vector unsigned char perm2 = vec_add(perm1, vec_splat_u8(1));
+    vector unsigned char pix1v, pix3v, pix3iv;
+    vector unsigned short pix3lv, pix3hv, pix3ilv, pix3ihv;
+    vector unsigned short avghv, avglv;
+    vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
+    vector signed int sumdiffs;
+
+    /* Due to the fact that pix3 = pix2 + line_size, the pix3 of one
+     * iteration becomes pix2 in the next iteration. We can use this
+     * fact to avoid a potentially expensive unaligned read, as well
+     * as some splitting, and vector addition each time around the loop.
+     * Read unaligned pixels into our vectors. The vectors are as follows:
+     * pix2v: pix2[0] - pix2[15]  pix2iv: pix2[1] - pix2[16]
+     * Split the pixel vectors into shorts. */
+    vector unsigned char pix2l  = vec_ld(0,  pix2);
+    vector unsigned char pix2r  = vec_ld(16, pix2);
+    vector unsigned char pix2v  = vec_perm(pix2l, pix2r, perm1);
+    vector unsigned char pix2iv = vec_perm(pix2l, pix2r, perm2);
+
+    vector unsigned short pix2hv  =
+        (vector unsigned short) vec_mergeh(zero, pix2v);
+    vector unsigned short pix2lv  =
+        (vector unsigned short) vec_mergel(zero, pix2v);
+    vector unsigned short pix2ihv =
+        (vector unsigned short) vec_mergeh(zero, pix2iv);
+    vector unsigned short pix2ilv =
+        (vector unsigned short) vec_mergel(zero, pix2iv);
+    vector unsigned short t1 = vec_add(pix2hv, pix2ihv);
+    vector unsigned short t2 = vec_add(pix2lv, pix2ilv);
+    vector unsigned short t3, t4;
+
+    for (i = 0; i < h; i++) {
+        /* Read unaligned pixels into our vectors. The vectors are as follows:
+         * pix1v: pix1[0] - pix1[15]
+         * pix3v: pix3[0] - pix3[15]      pix3iv: pix3[1] - pix3[16] */
+        pix1v  = vec_ld(0, pix1);
+
+        pix2l  = vec_ld(0, pix3);
+        pix2r  = vec_ld(16, pix3);
+        pix3v  = vec_perm(pix2l, pix2r, perm1);
+        pix3iv = vec_perm(pix2l, pix2r, perm2);
+
+        /* Note that AltiVec does have vec_avg, but this works on vector pairs
+         * and rounds up. We could do avg(avg(a, b), avg(c, d)), but the
+         * rounding would mean that, for example, avg(3, 0, 0, 1) = 2, when
+         * it should be 1. Instead, we have to split the pixel vectors into
+         * vectors of shorts and do the averaging by hand. */
+
+        /* Split the pixel vectors into shorts. */
+        pix3hv  = (vector unsigned short) vec_mergeh(zero, pix3v);
+        pix3lv  = (vector unsigned short) vec_mergel(zero, pix3v);
+        pix3ihv = (vector unsigned short) vec_mergeh(zero, pix3iv);
+        pix3ilv = (vector unsigned short) vec_mergel(zero, pix3iv);
+
+        /* Do the averaging on them. */
+        t3 = vec_add(pix3hv, pix3ihv);
+        t4 = vec_add(pix3lv, pix3ilv);
+
+        avghv = vec_sr(vec_add(vec_add(t1, t3), two), two);
+        avglv = vec_sr(vec_add(vec_add(t2, t4), two), two);
+
+        /* Pack the shorts back into a result. */
+        avgv = vec_pack(avghv, avglv);
+
+        /* Calculate a sum of abs differences vector. */
+        t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));
+
+        /* Add each 4 pixel group together and put 4 results into sad. */
+        sad = vec_sum4s(t5, sad);
+
+        pix1 += line_size;
+        pix3 += line_size;
+        /* Transfer the calculated values for pix3 into pix2. */
+        t1 = t3;
+        t2 = t4;
+    }
+    /* Sum up the four partial sums, and put the result into s. */
+    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
+    sumdiffs = vec_splat(sumdiffs, 3);
+    vec_ste(sumdiffs, 0, &s);
+
+    return s;
+}
+
+static int sad16_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                         int line_size, int h)
+{
+    int i, s;
+    const vector unsigned int zero =
+        (const vector unsigned int) vec_splat_u32(0);
+    vector unsigned char perm = vec_lvsl(0, pix2);
+    vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
+    vector signed int sumdiffs;
+
+    for (i = 0; i < h; i++) {
+        /* Read potentially unaligned pixels into t1 and t2. */
+        vector unsigned char pix2l = vec_ld(0,  pix2);
+        vector unsigned char pix2r = vec_ld(15, pix2);
+        vector unsigned char t1 = vec_ld(0, pix1);
+        vector unsigned char t2 = vec_perm(pix2l, pix2r, perm);
+
+        /* Calculate a sum of abs differences vector. */
+        vector unsigned char t3 = vec_max(t1, t2);
+        vector unsigned char t4 = vec_min(t1, t2);
+        vector unsigned char t5 = vec_sub(t3, t4);
+
+        /* Add each 4 pixel group together and put 4 results into sad. */
+        sad = vec_sum4s(t5, sad);
+
+        pix1 += line_size;
+        pix2 += line_size;
+    }
+
+    /* Sum up the four partial sums, and put the result into s. */
+    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
+    sumdiffs = vec_splat(sumdiffs, 3);
+    vec_ste(sumdiffs, 0, &s);
+
+    return s;
+}
+
+static int sad8_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                        int line_size, int h)
+{
+    int i, s;
+    const vector unsigned int zero =
+        (const vector unsigned int) vec_splat_u32(0);
+    const vector unsigned char permclear =
+        (vector unsigned char)
+        { 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0 };
+    vector unsigned char perm1 = vec_lvsl(0, pix1);
+    vector unsigned char perm2 = vec_lvsl(0, pix2);
+    vector unsigned int sad = (vector unsigned int) vec_splat_u32(0);
+    vector signed int sumdiffs;
+
+    for (i = 0; i < h; i++) {
+        /* Read potentially unaligned pixels into t1 and t2.
+         * Since we're reading 16 pixels, and actually only want 8,
+         * mask out the last 8 pixels. The 0s don't change the sum. */
+        vector unsigned char pix1l = vec_ld(0, pix1);
+        vector unsigned char pix1r = vec_ld(7, pix1);
+        vector unsigned char pix2l = vec_ld(0, pix2);
+        vector unsigned char pix2r = vec_ld(7, pix2);
+        vector unsigned char t1 = vec_and(vec_perm(pix1l, pix1r, perm1),
+                                          permclear);
+        vector unsigned char t2 = vec_and(vec_perm(pix2l, pix2r, perm2),
+                                          permclear);
+
+        /* Calculate a sum of abs differences vector. */
+        vector unsigned char t3 = vec_max(t1, t2);
+        vector unsigned char t4 = vec_min(t1, t2);
+        vector unsigned char t5 = vec_sub(t3, t4);
+
+        /* Add each 4 pixel group together and put 4 results into sad. */
+        sad = vec_sum4s(t5, sad);
+
+        pix1 += line_size;
+        pix2 += line_size;
+    }
+
+    /* Sum up the four partial sums, and put the result into s. */
+    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);
+    sumdiffs = vec_splat(sumdiffs, 3);
+    vec_ste(sumdiffs, 0, &s);
+
+    return s;
+}
+
+/* Sum of Squared Errors for an 8x8 block, AltiVec-enhanced.
+ * It's the sad8_altivec code above w/ squaring added. */
+static int sse8_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                        int line_size, int h)
+{
+    int i, s;
+    const vector unsigned int zero =
+        (const vector unsigned int) vec_splat_u32(0);
+    const vector unsigned char permclear =
+        (vector unsigned char)
+        { 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0 };
+    vector unsigned char perm1 = vec_lvsl(0, pix1);
+    vector unsigned char perm2 = vec_lvsl(0, pix2);
+    vector unsigned int sum = (vector unsigned int) vec_splat_u32(0);
+    vector signed int sumsqr;
+
+    for (i = 0; i < h; i++) {
+        /* Read potentially unaligned pixels into t1 and t2.
+         * Since we're reading 16 pixels, and actually only want 8,
+         * mask out the last 8 pixels. The 0s don't change the sum. */
+        vector unsigned char pix1l = vec_ld(0, pix1);
+        vector unsigned char pix1r = vec_ld(7, pix1);
+        vector unsigned char pix2l = vec_ld(0, pix2);
+        vector unsigned char pix2r = vec_ld(7, pix2);
+        vector unsigned char t1 = vec_and(vec_perm(pix1l, pix1r, perm1),
+                                          permclear);
+        vector unsigned char t2 = vec_and(vec_perm(pix2l, pix2r, perm2),
+                                          permclear);
+
+        /* Since we want to use unsigned chars, we can take advantage
+         * of the fact that abs(a - b) ^ 2 = (a - b) ^ 2. */
+
+        /* Calculate abs differences vector. */
+        vector unsigned char t3 = vec_max(t1, t2);
+        vector unsigned char t4 = vec_min(t1, t2);
+        vector unsigned char t5 = vec_sub(t3, t4);
+
+        /* Square the values and add them to our sum. */
+        sum = vec_msum(t5, t5, sum);
+
+        pix1 += line_size;
+        pix2 += line_size;
+    }
+
+    /* Sum up the four partial sums, and put the result into s. */
+    sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);
+    sumsqr = vec_splat(sumsqr, 3);
+    vec_ste(sumsqr, 0, &s);
+
+    return s;
+}
+
+/* Sum of Squared Errors for a 16x16 block, AltiVec-enhanced.
+ * It's the sad16_altivec code above w/ squaring added. */
+static int sse16_altivec(MpegEncContext *v, uint8_t *pix1, uint8_t *pix2,
+                         int line_size, int h)
+{
+    int i, s;
+    const vector unsigned int zero =
+        (const vector unsigned int) vec_splat_u32(0);
+    vector unsigned char perm = vec_lvsl(0, pix2);
+    vector unsigned int sum = (vector unsigned int) vec_splat_u32(0);
+    vector signed int sumsqr;
+
+    for (i = 0; i < h; i++) {
+        /* Read potentially unaligned pixels into t1 and t2. */
+        vector unsigned char pix2l = vec_ld(0,  pix2);
+        vector unsigned char pix2r = vec_ld(15, pix2);
+        vector unsigned char t1 = vec_ld(0, pix1);
+        vector unsigned char t2 = vec_perm(pix2l, pix2r, perm);
+
+        /* Since we want to use unsigned chars, we can take advantage
+         * of the fact that abs(a - b) ^ 2 = (a - b) ^ 2. */
+
+        /* Calculate abs differences vector. */
+        vector unsigned char t3 = vec_max(t1, t2);
+        vector unsigned char t4 = vec_min(t1, t2);
+        vector unsigned char t5 = vec_sub(t3, t4);
+
+        /* Square the values and add them to our sum. */
+        sum = vec_msum(t5, t5, sum);
+
+        pix1 += line_size;
+        pix2 += line_size;
+    }
+
+    /* Sum up the four partial sums, and put the result into s. */
+    sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);
+    sumsqr = vec_splat(sumsqr, 3);
+    vec_ste(sumsqr, 0, &s);
+
+    return s;
+}
+
+static int hadamard8_diff8x8_altivec(MpegEncContext *s, uint8_t *dst,
+                                     uint8_t *src, int stride, int h)
+{
+    int sum;
+    register const vector unsigned char vzero =
+        (const vector unsigned char) vec_splat_u8(0);
+    register vector signed short temp0, temp1, temp2, temp3, temp4,
+                                 temp5, temp6, temp7;
+    {
+        register const vector signed short vprod1 =
+            (const vector signed short) { 1, -1, 1, -1, 1, -1, 1, -1 };
+        register const vector signed short vprod2 =
+            (const vector signed short) { 1, 1, -1, -1, 1, 1, -1, -1 };
+        register const vector signed short vprod3 =
+            (const vector signed short) { 1, 1, 1, 1, -1, -1, -1, -1 };
+        register const vector unsigned char perm1 =
+            (const vector unsigned char)
+            { 0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,
+              0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D };
+        register const vector unsigned char perm2 =
+            (const vector unsigned char)
+            { 0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,
+              0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B };
+        register const vector unsigned char perm3 =
+            (const vector unsigned char)
+            { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+              0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
+
+#define ONEITERBUTTERFLY(i, res)                                            \
+    {                                                                       \
+        register vector unsigned char src1 = vec_ld(stride * i, src);       \
+        register vector unsigned char src2 = vec_ld(stride * i + 15, src);  \
+        register vector unsigned char srcO =                                \
+            vec_perm(src1, src2, vec_lvsl(stride * i, src));                \
+        register vector unsigned char dst1 = vec_ld(stride * i, dst);       \
+        register vector unsigned char dst2 = vec_ld(stride * i + 15, dst);  \
+        register vector unsigned char dstO =                                \
+            vec_perm(dst1, dst2, vec_lvsl(stride * i, dst));                \
+                                                                            \
+        /* Promote the unsigned chars to signed shorts. */                  \
+        /* We're in the 8x8 function, we only care for the first 8. */      \
+        register vector signed short srcV =                                 \
+            (vector signed short) vec_mergeh((vector signed char) vzero,    \
+                                             (vector signed char) srcO);    \
+        register vector signed short dstV =                                 \
+            (vector signed short) vec_mergeh((vector signed char) vzero,    \
+                                             (vector signed char) dstO);    \
+                                                                            \
+        /* subtractions inside the first butterfly */                       \
+        register vector signed short but0 = vec_sub(srcV, dstV);            \
+        register vector signed short op1  = vec_perm(but0, but0, perm1);    \
+        register vector signed short but1 = vec_mladd(but0, vprod1, op1);   \
+        register vector signed short op2  = vec_perm(but1, but1, perm2);    \
+        register vector signed short but2 = vec_mladd(but1, vprod2, op2);   \
+        register vector signed short op3  = vec_perm(but2, but2, perm3);    \
+        res  = vec_mladd(but2, vprod3, op3);                                \
+    }
+        ONEITERBUTTERFLY(0, temp0);
+        ONEITERBUTTERFLY(1, temp1);
+        ONEITERBUTTERFLY(2, temp2);
+        ONEITERBUTTERFLY(3, temp3);
+        ONEITERBUTTERFLY(4, temp4);
+        ONEITERBUTTERFLY(5, temp5);
+        ONEITERBUTTERFLY(6, temp6);
+        ONEITERBUTTERFLY(7, temp7);
+    }
+#undef ONEITERBUTTERFLY
+    {
+        register vector signed int vsum;
+        register vector signed short line0  = vec_add(temp0, temp1);
+        register vector signed short line1  = vec_sub(temp0, temp1);
+        register vector signed short line2  = vec_add(temp2, temp3);
+        register vector signed short line3  = vec_sub(temp2, temp3);
+        register vector signed short line4  = vec_add(temp4, temp5);
+        register vector signed short line5  = vec_sub(temp4, temp5);
+        register vector signed short line6  = vec_add(temp6, temp7);
+        register vector signed short line7  = vec_sub(temp6, temp7);
+
+        register vector signed short line0B = vec_add(line0, line2);
+        register vector signed short line2B = vec_sub(line0, line2);
+        register vector signed short line1B = vec_add(line1, line3);
+        register vector signed short line3B = vec_sub(line1, line3);
+        register vector signed short line4B = vec_add(line4, line6);
+        register vector signed short line6B = vec_sub(line4, line6);
+        register vector signed short line5B = vec_add(line5, line7);
+        register vector signed short line7B = vec_sub(line5, line7);
+
+        register vector signed short line0C = vec_add(line0B, line4B);
+        register vector signed short line4C = vec_sub(line0B, line4B);
+        register vector signed short line1C = vec_add(line1B, line5B);
+        register vector signed short line5C = vec_sub(line1B, line5B);
+        register vector signed short line2C = vec_add(line2B, line6B);
+        register vector signed short line6C = vec_sub(line2B, line6B);
+        register vector signed short line3C = vec_add(line3B, line7B);
+        register vector signed short line7C = vec_sub(line3B, line7B);
+
+        vsum = vec_sum4s(vec_abs(line0C), vec_splat_s32(0));
+        vsum = vec_sum4s(vec_abs(line1C), vsum);
+        vsum = vec_sum4s(vec_abs(line2C), vsum);
+        vsum = vec_sum4s(vec_abs(line3C), vsum);
+        vsum = vec_sum4s(vec_abs(line4C), vsum);
+        vsum = vec_sum4s(vec_abs(line5C), vsum);
+        vsum = vec_sum4s(vec_abs(line6C), vsum);
+        vsum = vec_sum4s(vec_abs(line7C), vsum);
+        vsum = vec_sums(vsum, (vector signed int) vzero);
+        vsum = vec_splat(vsum, 3);
+        vec_ste(vsum, 0, &sum);
+    }
+    return sum;
+}
+
+/*
+ * 16x8 works with 16 elements; it allows to avoid replicating loads, and
+ * gives the compiler more room for scheduling. It's only used from
+ * inside hadamard8_diff16_altivec.
+ *
+ * Unfortunately, it seems gcc-3.3 is a bit dumb, and the compiled code has
+ * a LOT of spill code, it seems gcc (unlike xlc) cannot keep everything in
+ * registers by itself. The following code includes hand-made register
+ * allocation. It's not clean, but on a 7450 the resulting code is much faster
+ * (best case falls from 700+ cycles to 550).
+ *
+ * xlc doesn't add spill code, but it doesn't know how to schedule for the
+ * 7450, and its code isn't much faster than gcc-3.3 on the 7450 (but uses
+ * 25% fewer instructions...)
+ *
+ * On the 970, the hand-made RA is still a win (around 690 vs. around 780),
+ * but xlc goes to around 660 on the regular C code...
+ */
+static int hadamard8_diff16x8_altivec(MpegEncContext *s, uint8_t *dst,
+                                      uint8_t *src, int stride, int h)
+{
+    int sum;
+    register vector signed short
+        temp0 __asm__ ("v0"),
+        temp1 __asm__ ("v1"),
+        temp2 __asm__ ("v2"),
+        temp3 __asm__ ("v3"),
+        temp4 __asm__ ("v4"),
+        temp5 __asm__ ("v5"),
+        temp6 __asm__ ("v6"),
+        temp7 __asm__ ("v7");
+    register vector signed short
+        temp0S __asm__ ("v8"),
+        temp1S __asm__ ("v9"),
+        temp2S __asm__ ("v10"),
+        temp3S __asm__ ("v11"),
+        temp4S __asm__ ("v12"),
+        temp5S __asm__ ("v13"),
+        temp6S __asm__ ("v14"),
+        temp7S __asm__ ("v15");
+    register const vector unsigned char vzero __asm__ ("v31") =
+        (const vector unsigned char) vec_splat_u8(0);
+    {
+        register const vector signed short vprod1 __asm__ ("v16") =
+            (const vector signed short) { 1, -1, 1, -1, 1, -1, 1, -1 };
+
+        register const vector signed short vprod2 __asm__ ("v17") =
+            (const vector signed short) { 1, 1, -1, -1, 1, 1, -1, -1 };
+
+        register const vector signed short vprod3 __asm__ ("v18") =
+            (const vector signed short) { 1, 1, 1, 1, -1, -1, -1, -1 };
+
+        register const vector unsigned char perm1 __asm__ ("v19") =
+            (const vector unsigned char)
+            { 0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,
+              0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D };
+
+        register const vector unsigned char perm2 __asm__ ("v20") =
+            (const vector unsigned char)
+            { 0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,
+              0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B };
+
+        register const vector unsigned char perm3 __asm__ ("v21") =
+            (const vector unsigned char)
+            { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+              0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
+
+#define ONEITERBUTTERFLY(i, res1, res2)                                     \
+    {                                                                       \
+        register vector unsigned char src1 __asm__ ("v22") =                \
+            vec_ld(stride * i, src);                                        \
+        register vector unsigned char src2 __asm__ ("v23") =                \
+            vec_ld(stride * i + 16, src);                                   \
+        register vector unsigned char srcO __asm__ ("v22") =                \
+            vec_perm(src1, src2, vec_lvsl(stride * i, src));                \
+        register vector unsigned char dst1 __asm__ ("v24") =                \
+            vec_ld(stride * i, dst);                                        \
+        register vector unsigned char dst2 __asm__ ("v25") =                \
+            vec_ld(stride * i + 16, dst);                                   \
+        register vector unsigned char dstO __asm__ ("v23") =                \
+            vec_perm(dst1, dst2, vec_lvsl(stride * i, dst));                \
+                                                                            \
+        /* Promote the unsigned chars to signed shorts. */                  \
+        register vector signed short srcV __asm__ ("v24") =                 \
+            (vector signed short) vec_mergeh((vector signed char) vzero,    \
+                                             (vector signed char) srcO);    \
+        register vector signed short dstV __asm__ ("v25") =                 \
+            (vector signed short) vec_mergeh((vector signed char) vzero,    \
+                                             (vector signed char) dstO);    \
+        register vector signed short srcW __asm__ ("v26") =                 \
+            (vector signed short) vec_mergel((vector signed char) vzero,    \
+                                             (vector signed char) srcO);    \
+        register vector signed short dstW __asm__ ("v27") =                 \
+            (vector signed short) vec_mergel((vector signed char) vzero,    \
+                                             (vector signed char) dstO);    \
+                                                                            \
+        /* subtractions inside the first butterfly */                       \
+        register vector signed short but0  __asm__ ("v28") =                \
+            vec_sub(srcV, dstV);                                            \
+        register vector signed short but0S __asm__ ("v29") =                \
+            vec_sub(srcW, dstW);                                            \
+        register vector signed short op1   __asm__ ("v30") =                \
+            vec_perm(but0, but0, perm1);                                    \
+        register vector signed short but1  __asm__ ("v22") =                \
+            vec_mladd(but0, vprod1, op1);                                   \
+        register vector signed short op1S  __asm__ ("v23") =                \
+            vec_perm(but0S, but0S, perm1);                                  \
+        register vector signed short but1S __asm__ ("v24") =                \
+            vec_mladd(but0S, vprod1, op1S);                                 \
+        register vector signed short op2   __asm__ ("v25") =                \
+            vec_perm(but1, but1, perm2);                                    \
+        register vector signed short but2  __asm__ ("v26") =                \
+            vec_mladd(but1, vprod2, op2);                                   \
+        register vector signed short op2S  __asm__ ("v27") =                \
+            vec_perm(but1S, but1S, perm2);                                  \
+        register vector signed short but2S __asm__ ("v28") =                \
+            vec_mladd(but1S, vprod2, op2S);                                 \
+        register vector signed short op3   __asm__ ("v29") =                \
+            vec_perm(but2, but2, perm3);                                    \
+        register vector signed short op3S  __asm__ ("v30") =                \
+            vec_perm(but2S, but2S, perm3);                                  \
+        res1 = vec_mladd(but2, vprod3, op3);                                \
+        res2 = vec_mladd(but2S, vprod3, op3S);                              \
+    }
+        ONEITERBUTTERFLY(0, temp0, temp0S);
+        ONEITERBUTTERFLY(1, temp1, temp1S);
+        ONEITERBUTTERFLY(2, temp2, temp2S);
+        ONEITERBUTTERFLY(3, temp3, temp3S);
+        ONEITERBUTTERFLY(4, temp4, temp4S);
+        ONEITERBUTTERFLY(5, temp5, temp5S);
+        ONEITERBUTTERFLY(6, temp6, temp6S);
+        ONEITERBUTTERFLY(7, temp7, temp7S);
+    }
+#undef ONEITERBUTTERFLY
+    {
+        register vector signed int vsum;
+
+        register vector signed short line0  = vec_add(temp0, temp1);
+        register vector signed short line1  = vec_sub(temp0, temp1);
+        register vector signed short line2  = vec_add(temp2, temp3);
+        register vector signed short line3  = vec_sub(temp2, temp3);
+        register vector signed short line4  = vec_add(temp4, temp5);
+        register vector signed short line5  = vec_sub(temp4, temp5);
+        register vector signed short line6  = vec_add(temp6, temp7);
+        register vector signed short line7  = vec_sub(temp6, temp7);
+
+        register vector signed short line0B = vec_add(line0, line2);
+        register vector signed short line2B = vec_sub(line0, line2);
+        register vector signed short line1B = vec_add(line1, line3);
+        register vector signed short line3B = vec_sub(line1, line3);
+        register vector signed short line4B = vec_add(line4, line6);
+        register vector signed short line6B = vec_sub(line4, line6);
+        register vector signed short line5B = vec_add(line5, line7);
+        register vector signed short line7B = vec_sub(line5, line7);
+
+        register vector signed short line0C = vec_add(line0B, line4B);
+        register vector signed short line4C = vec_sub(line0B, line4B);
+        register vector signed short line1C = vec_add(line1B, line5B);
+        register vector signed short line5C = vec_sub(line1B, line5B);
+        register vector signed short line2C = vec_add(line2B, line6B);
+        register vector signed short line6C = vec_sub(line2B, line6B);
+        register vector signed short line3C = vec_add(line3B, line7B);
+        register vector signed short line7C = vec_sub(line3B, line7B);
+
+        register vector signed short line0S = vec_add(temp0S, temp1S);
+        register vector signed short line1S = vec_sub(temp0S, temp1S);
+        register vector signed short line2S = vec_add(temp2S, temp3S);
+        register vector signed short line3S = vec_sub(temp2S, temp3S);
+        register vector signed short line4S = vec_add(temp4S, temp5S);
+        register vector signed short line5S = vec_sub(temp4S, temp5S);
+        register vector signed short line6S = vec_add(temp6S, temp7S);
+        register vector signed short line7S = vec_sub(temp6S, temp7S);
+
+        register vector signed short line0BS = vec_add(line0S, line2S);
+        register vector signed short line2BS = vec_sub(line0S, line2S);
+        register vector signed short line1BS = vec_add(line1S, line3S);
+        register vector signed short line3BS = vec_sub(line1S, line3S);
+        register vector signed short line4BS = vec_add(line4S, line6S);
+        register vector signed short line6BS = vec_sub(line4S, line6S);
+        register vector signed short line5BS = vec_add(line5S, line7S);
+        register vector signed short line7BS = vec_sub(line5S, line7S);
+
+        register vector signed short line0CS = vec_add(line0BS, line4BS);
+        register vector signed short line4CS = vec_sub(line0BS, line4BS);
+        register vector signed short line1CS = vec_add(line1BS, line5BS);
+        register vector signed short line5CS = vec_sub(line1BS, line5BS);
+        register vector signed short line2CS = vec_add(line2BS, line6BS);
+        register vector signed short line6CS = vec_sub(line2BS, line6BS);
+        register vector signed short line3CS = vec_add(line3BS, line7BS);
+        register vector signed short line7CS = vec_sub(line3BS, line7BS);
+
+        vsum = vec_sum4s(vec_abs(line0C), vec_splat_s32(0));
+        vsum = vec_sum4s(vec_abs(line1C), vsum);
+        vsum = vec_sum4s(vec_abs(line2C), vsum);
+        vsum = vec_sum4s(vec_abs(line3C), vsum);
+        vsum = vec_sum4s(vec_abs(line4C), vsum);
+        vsum = vec_sum4s(vec_abs(line5C), vsum);
+        vsum = vec_sum4s(vec_abs(line6C), vsum);
+        vsum = vec_sum4s(vec_abs(line7C), vsum);
+
+        vsum = vec_sum4s(vec_abs(line0CS), vsum);
+        vsum = vec_sum4s(vec_abs(line1CS), vsum);
+        vsum = vec_sum4s(vec_abs(line2CS), vsum);
+        vsum = vec_sum4s(vec_abs(line3CS), vsum);
+        vsum = vec_sum4s(vec_abs(line4CS), vsum);
+        vsum = vec_sum4s(vec_abs(line5CS), vsum);
+        vsum = vec_sum4s(vec_abs(line6CS), vsum);
+        vsum = vec_sum4s(vec_abs(line7CS), vsum);
+        vsum = vec_sums(vsum, (vector signed int) vzero);
+        vsum = vec_splat(vsum, 3);
+        vec_ste(vsum, 0, &sum);
+    }
+    return sum;
+}
+
+static int hadamard8_diff16_altivec(MpegEncContext *s, uint8_t *dst,
+                                    uint8_t *src, int stride, int h)
+{
+    int score = hadamard8_diff16x8_altivec(s, dst, src, stride, 8);
+
+    if (h == 16) {
+        dst   += 8 * stride;
+        src   += 8 * stride;
+        score += hadamard8_diff16x8_altivec(s, dst, src, stride, 8);
+    }
+    return score;
+}
+#endif /* HAVE_ALTIVEC */
+
+av_cold void ff_me_cmp_init_ppc(MECmpContext *c, AVCodecContext *avctx)
+{
+#if HAVE_ALTIVEC
+    if (!PPC_ALTIVEC(av_get_cpu_flags()))
+        return;
+
+    c->pix_abs[0][1] = sad16_x2_altivec;
+    c->pix_abs[0][2] = sad16_y2_altivec;
+    c->pix_abs[0][3] = sad16_xy2_altivec;
+    c->pix_abs[0][0] = sad16_altivec;
+    c->pix_abs[1][0] = sad8_altivec;
+
+    c->sad[0] = sad16_altivec;
+    c->sad[1] = sad8_altivec;
+    c->sse[0] = sse16_altivec;
+    c->sse[1] = sse8_altivec;
+
+    c->hadamard8_diff[0] = hadamard8_diff16_altivec;
+    c->hadamard8_diff[1] = hadamard8_diff8x8_altivec;
+#endif /* HAVE_ALTIVEC */
+}