Sanitize altivec code so it can be built with runtime check properly

Originally committed as revision 10640 to svn://svn.ffmpeg.org/ffmpeg/trunk

14 files changed, 404 insertions, 292 deletions

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index a41dd8f53c..e5d6b13b2d 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -403,7 +403,7 @@ OBJS-$(ARCH_SH4)                       += sh4/idct_sh4.o      \
                                           sh4/dsputil_align.o \
                                           sh4/dsputil_sh4.o   \
 
-OBJS-$(HAVE_ALTIVEC)                   += ppc/dsputil_altivec.o      \
+ALTIVEC-OBJS-yes                       += ppc/dsputil_altivec.o      \
                                           ppc/fdct_altivec.o         \
                                           ppc/fft_altivec.o          \
                                           ppc/float_altivec.o        \
@@ -413,12 +413,17 @@ OBJS-$(HAVE_ALTIVEC)                   += ppc/dsputil_altivec.o      \
                                           ppc/mpegvideo_altivec.o    \
                                           ppc/mpegvideo_ppc.o        \
 
-ifeq ($(HAVE_ALTIVEC),yes)
-OBJS-$(CONFIG_H264_DECODER)            += ppc/h264_altivec.o
-OBJS-$(CONFIG_SNOW_DECODER)            += ppc/snow_altivec.o
-OBJS-$(CONFIG_VC1_DECODER)             += ppc/vc1dsp_altivec.o
-OBJS-$(CONFIG_WMV3_DECODER)            += ppc/vc1dsp_altivec.o
-endif
+ALTIVEC-OBJS-$(CONFIG_H264_DECODER)    += ppc/h264_altivec.o
+ALTIVEC-OBJS-$(CONFIG_SNOW_DECODER)    += ppc/snow_altivec.o
+ALTIVEC-OBJS-$(CONFIG_VC1_DECODER)     += ppc/vc1dsp_altivec.o
+ALTIVEC-OBJS-$(CONFIG_WMV3_DECODER)    += ppc/vc1dsp_altivec.o
+
+# -maltivec is needed in order to build AltiVec code.
+$(ALTIVEC-OBJS-yes): CFLAGS += -maltivec -mabi=altivec
+
+# check_altivec must be built without -maltivec
+OBJS-$(HAVE_ALTIVEC)                   += $(ALTIVEC-OBJS-yes)       \
+                                          ppc/check_altivec.o
 
 OBJS-$(ARCH_BFIN)                      += bfin/dsputil_bfin.o \
                                           bfin/mpegvideo_bfin.o \
diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h
index 3c6121c3b6..dcccee991b 100644
--- a/libavcodec/dsputil.h
+++ b/libavcodec/dsputil.h
@@ -557,12 +557,6 @@ extern int mm_flags;
 
 extern int mm_flags;
 
-#if defined(HAVE_ALTIVEC) && !defined(__APPLE_CC__)
-#define pixel altivec_pixel
-#include <altivec.h>
-#undef pixel
-#endif
-
 #define DECLARE_ALIGNED_8(t, v) DECLARE_ALIGNED(16, t, v)
 #define STRIDE_ALIGN 16
 
diff --git a/libavcodec/imgresample.c b/libavcodec/imgresample.c
index 3e1f3fe110..d1d6757c6c 100644
--- a/libavcodec/imgresample.c
+++ b/libavcodec/imgresample.c
@@ -28,6 +28,10 @@
 #include "swscale.h"
 #include "dsputil.h"
 
+#ifdef HAVE_ALTIVEC
+#include "ppc/imgresample_altivec.h"
+#endif
+
 #define NB_COMPONENTS 3
 
 #define PHASE_BITS 4
@@ -281,133 +285,6 @@ static void v_resample4_mmx(uint8_t *dst, int dst_width, const uint8_t *src,
 }
 #endif /* HAVE_MMX */
 
-#ifdef HAVE_ALTIVEC
-typedef         union {
-    vector unsigned char v;
-    unsigned char c[16];
-} vec_uc_t;
-
-typedef         union {
-    vector signed short v;
-    signed short s[8];
-} vec_ss_t;
-
-void v_resample16_altivec(uint8_t *dst, int dst_width, const uint8_t *src,
-                          int wrap, int16_t *filter)
-{
-    int sum, i;
-    const uint8_t *s;
-    vector unsigned char *tv, tmp, dstv, zero;
-    vec_ss_t srchv[4], srclv[4], fv[4];
-    vector signed short zeros, sumhv, sumlv;
-    s = src;
-
-    for(i=0;i<4;i++)
-    {
-        /*
-           The vec_madds later on does an implicit >>15 on the result.
-           Since FILTER_BITS is 8, and we have 15 bits of magnitude in
-           a signed short, we have just enough bits to pre-shift our
-           filter constants <<7 to compensate for vec_madds.
-        */
-        fv[i].s[0] = filter[i] << (15-FILTER_BITS);
-        fv[i].v = vec_splat(fv[i].v, 0);
-    }
-
-    zero = vec_splat_u8(0);
-    zeros = vec_splat_s16(0);
-
-
-    /*
-       When we're resampling, we'd ideally like both our input buffers,
-       and output buffers to be 16-byte aligned, so we can do both aligned
-       reads and writes. Sadly we can't always have this at the moment, so
-       we opt for aligned writes, as unaligned writes have a huge overhead.
-       To do this, do enough scalar resamples to get dst 16-byte aligned.
-    */
-    i = (-(int)dst) & 0xf;
-    while(i>0) {
-        sum = s[0 * wrap] * filter[0] +
-        s[1 * wrap] * filter[1] +
-        s[2 * wrap] * filter[2] +
-        s[3 * wrap] * filter[3];
-        sum = sum >> FILTER_BITS;
-        if (sum<0) sum = 0; else if (sum>255) sum=255;
-        dst[0] = sum;
-        dst++;
-        s++;
-        dst_width--;
-        i--;
-    }
-
-    /* Do our altivec resampling on 16 pixels at once. */
-    while(dst_width>=16) {
-        /*
-           Read 16 (potentially unaligned) bytes from each of
-           4 lines into 4 vectors, and split them into shorts.
-           Interleave the multipy/accumulate for the resample
-           filter with the loads to hide the 3 cycle latency
-           the vec_madds have.
-        */
-        tv = (vector unsigned char *) &s[0 * wrap];
-        tmp = vec_perm(tv[0], tv[1], vec_lvsl(0, &s[i * wrap]));
-        srchv[0].v = (vector signed short) vec_mergeh(zero, tmp);
-        srclv[0].v = (vector signed short) vec_mergel(zero, tmp);
-        sumhv = vec_madds(srchv[0].v, fv[0].v, zeros);
-        sumlv = vec_madds(srclv[0].v, fv[0].v, zeros);
-
-        tv = (vector unsigned char *) &s[1 * wrap];
-        tmp = vec_perm(tv[0], tv[1], vec_lvsl(0, &s[1 * wrap]));
-        srchv[1].v = (vector signed short) vec_mergeh(zero, tmp);
-        srclv[1].v = (vector signed short) vec_mergel(zero, tmp);
-        sumhv = vec_madds(srchv[1].v, fv[1].v, sumhv);
-        sumlv = vec_madds(srclv[1].v, fv[1].v, sumlv);
-
-        tv = (vector unsigned char *) &s[2 * wrap];
-        tmp = vec_perm(tv[0], tv[1], vec_lvsl(0, &s[2 * wrap]));
-        srchv[2].v = (vector signed short) vec_mergeh(zero, tmp);
-        srclv[2].v = (vector signed short) vec_mergel(zero, tmp);
-        sumhv = vec_madds(srchv[2].v, fv[2].v, sumhv);
-        sumlv = vec_madds(srclv[2].v, fv[2].v, sumlv);
-
-        tv = (vector unsigned char *) &s[3 * wrap];
-        tmp = vec_perm(tv[0], tv[1], vec_lvsl(0, &s[3 * wrap]));
-        srchv[3].v = (vector signed short) vec_mergeh(zero, tmp);
-        srclv[3].v = (vector signed short) vec_mergel(zero, tmp);
-        sumhv = vec_madds(srchv[3].v, fv[3].v, sumhv);
-        sumlv = vec_madds(srclv[3].v, fv[3].v, sumlv);
-
-        /*
-           Pack the results into our destination vector,
-           and do an aligned write of that back to memory.
-        */
-        dstv = vec_packsu(sumhv, sumlv) ;
-        vec_st(dstv, 0, (vector unsigned char *) dst);
-
-        dst+=16;
-        s+=16;
-        dst_width-=16;
-    }
-
-    /*
-       If there are any leftover pixels, resample them
-       with the slow scalar method.
-    */
-    while(dst_width>0) {
-        sum = s[0 * wrap] * filter[0] +
-        s[1 * wrap] * filter[1] +
-        s[2 * wrap] * filter[2] +
-        s[3 * wrap] * filter[3];
-        sum = sum >> FILTER_BITS;
-        if (sum<0) sum = 0; else if (sum>255) sum=255;
-        dst[0] = sum;
-        dst++;
-        s++;
-        dst_width--;
-    }
-}
-#endif /* HAVE_ALTIVEC */
-
 /* slow version to handle limit cases. Does not need optimisation */
 static void h_resample_slow(uint8_t *dst, int dst_width,
                             const uint8_t *src, int src_width,
diff --git a/libavcodec/ppc/check_altivec.c b/libavcodec/ppc/check_altivec.c
new file mode 100644
index 0000000000..72b4afe48a
--- /dev/null
+++ b/libavcodec/ppc/check_altivec.c
@@ -0,0 +1,95 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+/**
+ * @file check_altivec.c
+ * Checks for AltiVec presence.
+ */
+
+#ifdef __APPLE__
+#include <sys/sysctl.h>
+#elif __AMIGAOS4__
+#include <exec/exec.h>
+#include <interfaces/exec.h>
+#include <proto/exec.h>
+#else
+#include <signal.h>
+#include <setjmp.h>
+
+static sigjmp_buf jmpbuf;
+static volatile sig_atomic_t canjump = 0;
+
+static void sigill_handler (int sig)
+{
+    if (!canjump) {
+        signal (sig, SIG_DFL);
+        raise (sig);
+    }
+
+    canjump = 0;
+    siglongjmp (jmpbuf, 1);
+}
+#endif /* __APPLE__ */
+
+/**
+ * This function MAY rely on signal() or fork() in order to make sure altivec
+ * is present
+ */
+
+int has_altivec(void)
+{
+#ifdef __AMIGAOS4__
+    ULONG result = 0;
+    extern struct ExecIFace *IExec;
+
+    IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
+    if (result == VECTORTYPE_ALTIVEC) return 1;
+    return 0;
+#elif __APPLE__
+    int sels[2] = {CTL_HW, HW_VECTORUNIT};
+    int has_vu = 0;
+    size_t len = sizeof(has_vu);
+    int err;
+
+    err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
+
+    if (err == 0) return (has_vu != 0);
+    return 0;
+#else
+/* Do it the brute-force way, borrowed from the libmpeg2 library. */
+    {
+      signal (SIGILL, sigill_handler);
+      if (sigsetjmp (jmpbuf, 1)) {
+        signal (SIGILL, SIG_DFL);
+      } else {
+        canjump = 1;
+
+        asm volatile ("mtspr 256, %0\n\t"
+                      "vand %%v0, %%v0, %%v0"
+                      :
+                      : "r" (-1));
+
+        signal (SIGILL, SIG_DFL);
+        return 1;
+      }
+    }
+    return 0;
+#endif /* __AMIGAOS4__ */
+}
+
diff --git a/libavcodec/ppc/dsputil_altivec.c b/libavcodec/ppc/dsputil_altivec.c
index 0fb13d91eb..da243d989f 100644
--- a/libavcodec/ppc/dsputil_altivec.c
+++ b/libavcodec/ppc/dsputil_altivec.c
@@ -25,31 +25,7 @@
 #include "gcc_fixes.h"
 
 #include "dsputil_altivec.h"
-
-#ifdef __APPLE__
-#include <sys/sysctl.h>
-#elif __AMIGAOS4__
-#include <exec/exec.h>
-#include <interfaces/exec.h>
-#include <proto/exec.h>
-#else
-#include <signal.h>
-#include <setjmp.h>
-
-static sigjmp_buf jmpbuf;
-static volatile sig_atomic_t canjump = 0;
-
-static void sigill_handler (int sig)
-{
-    if (!canjump) {
-        signal (sig, SIG_DFL);
-        raise (sig);
-    }
-
-    canjump = 0;
-    siglongjmp (jmpbuf, 1);
-}
-#endif /* __APPLE__ */
+#include "util_altivec.h"
 
 int sad16_x2_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
 {
@@ -1417,47 +1393,6 @@ POWERPC_PERF_STOP_COUNT(altivec_hadamard8_diff16_num, 1);
     return score;
 }
 
-int has_altivec(void)
-{
-#ifdef __AMIGAOS4__
-    ULONG result = 0;
-    extern struct ExecIFace *IExec;
-
-    IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
-    if (result == VECTORTYPE_ALTIVEC) return 1;
-    return 0;
-#elif __APPLE__
-    int sels[2] = {CTL_HW, HW_VECTORUNIT};
-    int has_vu = 0;
-    size_t len = sizeof(has_vu);
-    int err;
-
-    err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
-
-    if (err == 0) return (has_vu != 0);
-    return 0;
-#else
-/* Do it the brute-force way, borrowed from the libmpeg2 library. */
-    {
-      signal (SIGILL, sigill_handler);
-      if (sigsetjmp (jmpbuf, 1)) {
-        signal (SIGILL, SIG_DFL);
-      } else {
-        canjump = 1;
-
-        asm volatile ("mtspr 256, %0\n\t"
-                      "vand %%v0, %%v0, %%v0"
-                      :
-                      : "r" (-1));
-
-        signal (SIGILL, SIG_DFL);
-        return 1;
-      }
-    }
-    return 0;
-#endif /* __AMIGAOS4__ */
-}
-
 static void vorbis_inverse_coupling_altivec(float *mag, float *ang,
                                             int blocksize)
 {
diff --git a/libavcodec/ppc/dsputil_altivec.h b/libavcodec/ppc/dsputil_altivec.h
index 846b4c4d68..539fa04e74 100644
--- a/libavcodec/ppc/dsputil_altivec.h
+++ b/libavcodec/ppc/dsputil_altivec.h
@@ -31,83 +31,4 @@ void put_pixels16_altivec(uint8_t *block, const uint8_t *pixels, int line_size,
 
 void avg_pixels16_altivec(uint8_t *block, const uint8_t *pixels, int line_size, int h);
 
-// used to build registers permutation vectors (vcprm)
-// the 's' are for words in the _s_econd vector
-#define WORD_0 0x00,0x01,0x02,0x03
-#define WORD_1 0x04,0x05,0x06,0x07
-#define WORD_2 0x08,0x09,0x0a,0x0b
-#define WORD_3 0x0c,0x0d,0x0e,0x0f
-#define WORD_s0 0x10,0x11,0x12,0x13
-#define WORD_s1 0x14,0x15,0x16,0x17
-#define WORD_s2 0x18,0x19,0x1a,0x1b
-#define WORD_s3 0x1c,0x1d,0x1e,0x1f
-
-#ifdef __APPLE_CC__
-#define vcprm(a,b,c,d) (const vector unsigned char)(WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d)
-#else
-#define vcprm(a,b,c,d) (const vector unsigned char){WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d}
-#endif
-
-// vcprmle is used to keep the same index as in the SSE version.
-// it's the same as vcprm, with the index inversed
-// ('le' is Little Endian)
-#define vcprmle(a,b,c,d) vcprm(d,c,b,a)
-
-// used to build inverse/identity vectors (vcii)
-// n is _n_egative, p is _p_ositive
-#define FLOAT_n -1.
-#define FLOAT_p 1.
-
-
-#ifdef __APPLE_CC__
-#define vcii(a,b,c,d) (const vector float)(FLOAT_ ## a, FLOAT_ ## b, FLOAT_ ## c, FLOAT_ ## d)
-#else
-#define vcii(a,b,c,d) (const vector float){FLOAT_ ## a, FLOAT_ ## b, FLOAT_ ## c, FLOAT_ ## d}
-#endif
-
-// Transpose 8x8 matrix of 16-bit elements (in-place)
-#define TRANSPOSE8(a,b,c,d,e,f,g,h) \
-do { \
-    vector signed short A1, B1, C1, D1, E1, F1, G1, H1; \
-    vector signed short A2, B2, C2, D2, E2, F2, G2, H2; \
- \
-    A1 = vec_mergeh (a, e); \
-    B1 = vec_mergel (a, e); \
-    C1 = vec_mergeh (b, f); \
-    D1 = vec_mergel (b, f); \
-    E1 = vec_mergeh (c, g); \
-    F1 = vec_mergel (c, g); \
-    G1 = vec_mergeh (d, h); \
-    H1 = vec_mergel (d, h); \
- \
-    A2 = vec_mergeh (A1, E1); \
-    B2 = vec_mergel (A1, E1); \
-    C2 = vec_mergeh (B1, F1); \
-    D2 = vec_mergel (B1, F1); \
-    E2 = vec_mergeh (C1, G1); \
-    F2 = vec_mergel (C1, G1); \
-    G2 = vec_mergeh (D1, H1); \
-    H2 = vec_mergel (D1, H1); \
- \
-    a = vec_mergeh (A2, E2); \
-    b = vec_mergel (A2, E2); \
-    c = vec_mergeh (B2, F2); \
-    d = vec_mergel (B2, F2); \
-    e = vec_mergeh (C2, G2); \
-    f = vec_mergel (C2, G2); \
-    g = vec_mergeh (D2, H2); \
-    h = vec_mergel (D2, H2); \
-} while (0)
-
-
-/** \brief loads unaligned vector \a *src with offset \a offset
-    and returns it */
-static inline vector unsigned char unaligned_load(int offset, uint8_t *src)
-{
-    register vector unsigned char first = vec_ld(offset, src);
-    register vector unsigned char second = vec_ld(offset+15, src);
-    register vector unsigned char mask = vec_lvsl(offset, src);
-    return vec_perm(first, second, mask);
-}
-
 #endif /* DSPUTIL_ALTIVEC_H */
diff --git a/libavcodec/ppc/fft_altivec.c b/libavcodec/ppc/fft_altivec.c
index 62de81f5d8..e0b77807f8 100644
--- a/libavcodec/ppc/fft_altivec.c
+++ b/libavcodec/ppc/fft_altivec.c
@@ -24,8 +24,8 @@
 
 #include "gcc_fixes.h"
 
-#include "dsputil_altivec.h"
-
+#include "dsputil_ppc.h"
+#include "util_altivec.h"
 /*
   those three macros are from libavcodec/fft.c
   and are required for the reference C code
diff --git a/libavcodec/ppc/gmc_altivec.c b/libavcodec/ppc/gmc_altivec.c
index 1126eb89ca..b7a477dd96 100644
--- a/libavcodec/ppc/gmc_altivec.c
+++ b/libavcodec/ppc/gmc_altivec.c
@@ -24,7 +24,8 @@
 
 #include "gcc_fixes.h"
 
-#include "dsputil_altivec.h"
+#include "dsputil_ppc.h"
+#include "util_altivec.h"
 
 /*
   altivec-enhanced gmc1. ATM this code assume stride is a multiple of 8,
diff --git a/libavcodec/ppc/h264_altivec.c b/libavcodec/ppc/h264_altivec.c
index 6e42694feb..8a98435163 100644
--- a/libavcodec/ppc/h264_altivec.c
+++ b/libavcodec/ppc/h264_altivec.c
@@ -22,7 +22,8 @@
 
 #include "gcc_fixes.h"
 
-#include "dsputil_altivec.h"
+#include "dsputil_ppc.h"
+#include "util_altivec.h"
 #include "types_altivec.h"
 
 #define PUT_OP_U8_ALTIVEC(d, s, dst) d = s
diff --git a/libavcodec/ppc/imgresample_altivec.c b/libavcodec/ppc/imgresample_altivec.c
new file mode 100644
index 0000000000..3b161c5a6d
--- /dev/null
+++ b/libavcodec/ppc/imgresample_altivec.c
@@ -0,0 +1,153 @@
+/*
+ * High quality image resampling with polyphase filters
+ * Copyright (c) 2001 Fabrice Bellard.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file imgresample_altivec.c
+ * High quality image resampling with polyphase filters - AltiVec bits
+ */
+
+#include "gcc_fixes.h"
+
+typedef         union {
+    vector unsigned char v;
+    unsigned char c[16];
+} vec_uc_t;
+
+typedef         union {
+    vector signed short v;
+    signed short s[8];
+} vec_ss_t;
+
+void v_resample16_altivec(uint8_t *dst, int dst_width, const uint8_t *src,
+                          int wrap, int16_t *filter)
+{
+    int sum, i;
+    const uint8_t *s;
+    vector unsigned char *tv, tmp, dstv, zero;
+    vec_ss_t srchv[4], srclv[4], fv[4];
+    vector signed short zeros, sumhv, sumlv;
+    s = src;
+
+    for(i=0;i<4;i++)
+    {
+        /*
+           The vec_madds later on does an implicit >>15 on the result.
+           Since FILTER_BITS is 8, and we have 15 bits of magnitude in
+           a signed short, we have just enough bits to pre-shift our
+           filter constants <<7 to compensate for vec_madds.
+        */
+        fv[i].s[0] = filter[i] << (15-FILTER_BITS);
+        fv[i].v = vec_splat(fv[i].v, 0);
+    }
+
+    zero = vec_splat_u8(0);
+    zeros = vec_splat_s16(0);
+
+
+    /*
+       When we're resampling, we'd ideally like both our input buffers,
+       and output buffers to be 16-byte aligned, so we can do both aligned
+       reads and writes. Sadly we can't always have this at the moment, so
+       we opt for aligned writes, as unaligned writes have a huge overhead.
+       To do this, do enough scalar resamples to get dst 16-byte aligned.
+    */
+    i = (-(int)dst) & 0xf;
+    while(i>0) {
+        sum = s[0 * wrap] * filter[0] +
+        s[1 * wrap] * filter[1] +
+        s[2 * wrap] * filter[2] +
+        s[3 * wrap] * filter[3];
+        sum = sum >> FILTER_BITS;
+        if (sum<0) sum = 0; else if (sum>255) sum=255;
+        dst[0] = sum;
+        dst++;
+        s++;
+        dst_width--;
+        i--;
+    }
+
+    /* Do our altivec resampling on 16 pixels at once. */
+    while(dst_width>=16) {
+        /*
+           Read 16 (potentially unaligned) bytes from each of
+           4 lines into 4 vectors, and split them into shorts.
+           Interleave the multipy/accumulate for the resample
+           filter with the loads to hide the 3 cycle latency
+           the vec_madds have.
+        */
+        tv = (vector unsigned char *) &s[0 * wrap];
+        tmp = vec_perm(tv[0], tv[1], vec_lvsl(0, &s[i * wrap]));
+        srchv[0].v = (vector signed short) vec_mergeh(zero, tmp);
+        srclv[0].v = (vector signed short) vec_mergel(zero, tmp);
+        sumhv = vec_madds(srchv[0].v, fv[0].v, zeros);
+        sumlv = vec_madds(srclv[0].v, fv[0].v, zeros);
+
+        tv = (vector unsigned char *) &s[1 * wrap];
+        tmp = vec_perm(tv[0], tv[1], vec_lvsl(0, &s[1 * wrap]));
+        srchv[1].v = (vector signed short) vec_mergeh(zero, tmp);
+        srclv[1].v = (vector signed short) vec_mergel(zero, tmp);
+        sumhv = vec_madds(srchv[1].v, fv[1].v, sumhv);
+        sumlv = vec_madds(srclv[1].v, fv[1].v, sumlv);
+
+        tv = (vector unsigned char *) &s[2 * wrap];
+        tmp = vec_perm(tv[0], tv[1], vec_lvsl(0, &s[2 * wrap]));
+        srchv[2].v = (vector signed short) vec_mergeh(zero, tmp);
+        srclv[2].v = (vector signed short) vec_mergel(zero, tmp);
+        sumhv = vec_madds(srchv[2].v, fv[2].v, sumhv);
+        sumlv = vec_madds(srclv[2].v, fv[2].v, sumlv);
+
+        tv = (vector unsigned char *) &s[3 * wrap];
+        tmp = vec_perm(tv[0], tv[1], vec_lvsl(0, &s[3 * wrap]));
+        srchv[3].v = (vector signed short) vec_mergeh(zero, tmp);
+        srclv[3].v = (vector signed short) vec_mergel(zero, tmp);
+        sumhv = vec_madds(srchv[3].v, fv[3].v, sumhv);
+        sumlv = vec_madds(srclv[3].v, fv[3].v, sumlv);
+
+        /*
+           Pack the results into our destination vector,
+           and do an aligned write of that back to memory.
+        */
+        dstv = vec_packsu(sumhv, sumlv) ;
+        vec_st(dstv, 0, (vector unsigned char *) dst);
+
+        dst+=16;
+        s+=16;
+        dst_width-=16;
+    }
+
+    /*
+       If there are any leftover pixels, resample them
+       with the slow scalar method.
+    */
+    while(dst_width>0) {
+        sum = s[0 * wrap] * filter[0] +
+        s[1 * wrap] * filter[1] +
+        s[2 * wrap] * filter[2] +
+        s[3 * wrap] * filter[3];
+        sum = sum >> FILTER_BITS;
+        if (sum<0) sum = 0; else if (sum>255) sum=255;
+        dst[0] = sum;
+        dst++;
+        s++;
+        dst_width--;
+    }
+}
+
diff --git a/libavcodec/ppc/imgresample_altivec.h b/libavcodec/ppc/imgresample_altivec.h
new file mode 100644
index 0000000000..e7a1254591
--- /dev/null
+++ b/libavcodec/ppc/imgresample_altivec.h
@@ -0,0 +1,24 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef IMGRESAMPLE_ALTIVEC_H
+#define IMGRESAMPLE_ALTIVEC_H
+
+void v_resample16_altivec(uint8_t *dst, int dst_width, const uint8_t *src,
+                          int wrap, int16_t *filter);
+#endif /* IMGRESAMPLE_ALTIVEC_H */
diff --git a/libavcodec/ppc/mpegvideo_altivec.c b/libavcodec/ppc/mpegvideo_altivec.c
index 2292dbc6fb..12795e49ff 100644
--- a/libavcodec/ppc/mpegvideo_altivec.c
+++ b/libavcodec/ppc/mpegvideo_altivec.c
@@ -28,8 +28,8 @@
 
 #include "gcc_fixes.h"
 
-#include "dsputil_altivec.h"
-
+#include "dsputil_ppc.h"
+#include "util_altivec.h"
 // Swaps two variables (used for altivec registers)
 #define SWAP(a,b) \
 do { \
diff --git a/libavcodec/ppc/util_altivec.h b/libavcodec/ppc/util_altivec.h
new file mode 100644
index 0000000000..63b7f1a0c4
--- /dev/null
+++ b/libavcodec/ppc/util_altivec.h
@@ -0,0 +1,106 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file util_altivec.h
+ * Contains misc utility macros and inline functions
+ */
+
+#ifndef UTIL_ALTIVEC_H
+#define UTIL_ALTIVEC_H
+
+// used to build registers permutation vectors (vcprm)
+// the 's' are for words in the _s_econd vector
+#define WORD_0 0x00,0x01,0x02,0x03
+#define WORD_1 0x04,0x05,0x06,0x07
+#define WORD_2 0x08,0x09,0x0a,0x0b
+#define WORD_3 0x0c,0x0d,0x0e,0x0f
+#define WORD_s0 0x10,0x11,0x12,0x13
+#define WORD_s1 0x14,0x15,0x16,0x17
+#define WORD_s2 0x18,0x19,0x1a,0x1b
+#define WORD_s3 0x1c,0x1d,0x1e,0x1f
+
+#ifdef __APPLE_CC__
+#define vcprm(a,b,c,d) (const vector unsigned char)(WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d)
+#else
+#define vcprm(a,b,c,d) (const vector unsigned char){WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d}
+#endif
+
+// vcprmle is used to keep the same index as in the SSE version.
+// it's the same as vcprm, with the index inversed
+// ('le' is Little Endian)
+#define vcprmle(a,b,c,d) vcprm(d,c,b,a)
+
+// used to build inverse/identity vectors (vcii)
+// n is _n_egative, p is _p_ositive
+#define FLOAT_n -1.
+#define FLOAT_p 1.
+
+
+#ifdef __APPLE_CC__
+#define vcii(a,b,c,d) (const vector float)(FLOAT_ ## a, FLOAT_ ## b, FLOAT_ ## c, FLOAT_ ## d)
+#else
+#define vcii(a,b,c,d) (const vector float){FLOAT_ ## a, FLOAT_ ## b, FLOAT_ ## c, FLOAT_ ## d}
+#endif
+
+// Transpose 8x8 matrix of 16-bit elements (in-place)
+#define TRANSPOSE8(a,b,c,d,e,f,g,h) \
+do { \
+    vector signed short A1, B1, C1, D1, E1, F1, G1, H1; \
+    vector signed short A2, B2, C2, D2, E2, F2, G2, H2; \
+ \
+    A1 = vec_mergeh (a, e); \
+    B1 = vec_mergel (a, e); \
+    C1 = vec_mergeh (b, f); \
+    D1 = vec_mergel (b, f); \
+    E1 = vec_mergeh (c, g); \
+    F1 = vec_mergel (c, g); \
+    G1 = vec_mergeh (d, h); \
+    H1 = vec_mergel (d, h); \
+ \
+    A2 = vec_mergeh (A1, E1); \
+    B2 = vec_mergel (A1, E1); \
+    C2 = vec_mergeh (B1, F1); \
+    D2 = vec_mergel (B1, F1); \
+    E2 = vec_mergeh (C1, G1); \
+    F2 = vec_mergel (C1, G1); \
+    G2 = vec_mergeh (D1, H1); \
+    H2 = vec_mergel (D1, H1); \
+ \
+    a = vec_mergeh (A2, E2); \
+    b = vec_mergel (A2, E2); \
+    c = vec_mergeh (B2, F2); \
+    d = vec_mergel (B2, F2); \
+    e = vec_mergeh (C2, G2); \
+    f = vec_mergel (C2, G2); \
+    g = vec_mergeh (D2, H2); \
+    h = vec_mergel (D2, H2); \
+} while (0)
+
+
+/** \brief loads unaligned vector \a *src with offset \a offset
+    and returns it */
+static inline vector unsigned char unaligned_load(int offset, uint8_t *src)
+{
+    register vector unsigned char first = vec_ld(offset, src);
+    register vector unsigned char second = vec_ld(offset+15, src);
+    register vector unsigned char mask = vec_lvsl(offset, src);
+    return vec_perm(first, second, mask);
+}
+
+#endif /* UTIL_ALTIVEC_H */
diff --git a/libavcodec/ppc/vc1dsp_altivec.c b/libavcodec/ppc/vc1dsp_altivec.c
index 99f72e1f04..c00f80f1e0 100644
--- a/libavcodec/ppc/vc1dsp_altivec.c
+++ b/libavcodec/ppc/vc1dsp_altivec.c
@@ -23,7 +23,7 @@
 
 #include "gcc_fixes.h"
 
-#include "dsputil_altivec.h"
+#include "util_altivec.h"
 
 // main steps of 8x8 transform
 #define STEP8(s0, s1, s2, s3, s4, s5, s6, s7, vec_rnd) \