avutil/ppc/float_dsp_altivec: ppc: Fix bug in ff_vector_fmul_add_altivec()...

avutil/ppc/float_dsp_altivec: ppc: Fix bug in ff_vector_fmul_add_altivec() affecting little endian environments on POWER8
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavutil/ppc/float_dsp_altivec.c

@@ -75,20 +75,18 @@ void ff_vector_fmul_add_altivec(float *dst, const float *src0,
                                 int len)
 {
     int i;
-    vector float d, s0, s1, s2, t0, t1, edges;
-    vector unsigned char align = vec_lvsr(0,dst),
-                         mask = vec_lvsl(0, dst);
+    vector float d, ss0, ss1, ss2, t0, t1, edges;
 
     for (i = 0; i < len - 3; i += 4) {
         t0 = vec_ld(0, dst + i);
         t1 = vec_ld(15, dst + i);
-        s0 = vec_ld(0, src0 + i);
-        s1 = vec_ld(0, src1 + i);
-        s2 = vec_ld(0, src2 + i);
-        edges = vec_perm(t1, t0, mask);
-        d = vec_madd(s0, s1, s2);
-        t1 = vec_perm(d, edges, align);
-        t0 = vec_perm(edges, d, align);
+        ss0 = vec_ld(0, src0 + i);
+        ss1 = vec_ld(0, src1 + i);
+        ss2 = vec_ld(0, src2 + i);
+        edges = vec_perm(t1, t0, vcprm(0, 1, 2, 3));
+        d = vec_madd(ss0, ss1, ss2);
+        t1 = vec_perm(d, edges, vcprm(s0,s1,s2,s3));
+        t0 = vec_perm(edges, d, vcprm(s0,s1,s2,s3));
         vec_st(t1, 15, dst + i);
         vec_st(t0, 0, dst + i);
     }