1 #include <stdlib.h> 2 3 static /*__attribute__ ((noinline))*/ int Sub3(int a, int b, int c) { 4 const int pb = b - c; 5 const int pa = a - c; 6 return abs(pb) - abs(pa); 7 } 8 9 static unsigned Select(unsigned a, unsigned b, unsigned c) { 10 const int pa_minus_pb = 11 Sub3((a >> 24) & 0xff, (b >> 24) & 0xff, (c >> 24) & 0xff) + 12 Sub3((a >> 16) & 0xff, (b >> 16) & 0xff, (c >> 16) & 0xff) + 13 Sub3((a >> 8) & 0xff, (b >> 8) & 0xff, (c >> 8) & 0xff) + 14 Sub3((a >> 0) & 0xff, (b >> 0) & 0xff, (c >> 0) & 0xff); 15 return (pa_minus_pb <= 0) ? a : b; 16 } 17 18 static unsigned Predictor11(unsigned left, const unsigned* const top) { 19 const unsigned pred = Select(top[0], left, top[-1]); 20 return pred; 21 } 22 23 typedef unsigned (*VP8LPredictorFunc)(unsigned left, const unsigned* const top); 24 25 const VP8LPredictorFunc kPredictorsC[] = { 26 Predictor11, 27 }; 28
