iPhoneã§ã‚¤ãƒ³ãƒ©ã‚¤ãƒ³ã‚¢ã‚»ãƒ³ãƒ–ラを使ã†(プãƒã‚°ãƒ©ãƒ ç·¨[6] ç”»åƒã®ã‚°ãƒ¬ãƒ¼ã‚¹ã‚±ãƒ¼ãƒ«åŒ–) - å¼·ç«ã§é€²ã‚iPhoneã§ã®ã‚¤ãƒ³ãƒ©ã‚¤ãƒ³ã‚¢ã‚»ãƒ³ãƒ–ラã®ä½¿ã„方を簡å˜ã«èª¬æ˜Žã—ã¦ãã¾ã—ãŸãŒæœ€å¾Œã¨ãªã‚‹ç¬¬ï¼–回ã§ã¯å®Ÿç”¨çš„ãªã‚µãƒ³ãƒ—ルã¨ã—ã¦ã€Œç”»åƒã®ã‚°ãƒ¬ãƒ¼ã‚¹ã‚±ãƒ¼ãƒ«åŒ–ã€ã®è§£èª¬ã‚’ã—ã¾ã™ã€‚ サンプルã®ã‚¤ãƒ³ãƒ©ã‚¤ãƒ³ã‚¢ã‚»ãƒ³ãƒ–ラã®éƒ¨åˆ†ã¯ã“ã®æ§˜ã«ãªã‚Šã¾ã™ã€‚ static __inline__ void asmGrayscale(unsigned char *bitmap, int bitmapSize){ int div3 = 21845; // 16:16ã®å›ºå®šå°‘æ•°ã§ã® 1/3 ã®å€¤ __asm__ volatile ( "1: \n\t" // メモリã‹ã‚‰ãƒãƒ¼ãƒ‰ "ldrb r0, [%[src_bitmap]], #1 \n\t" // r0 = R値 "ldrb r1, [%[src_bitmap]], #1 \n\t" // r1 = G値 "ldrb r2, [%[src_bitmap]], #2 \n\t" // r2
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