#if defined __thumb__ #include "../../string/strchr.c" #else #include #include "xscale.h" char * strchr (const char *s, int c) { unsigned int c2; asm (PRELOADSTR ("%0") : : "r" (s)); c &= 0xff; #ifndef __OPTIMIZE_SIZE__ /* Skip unaligned part. */ if ((long)s & 3) { s--; do { int c2 = *++s; if (c2 == c) return (char *)s; if (c2 == '\0') return 0; } while (((long)s & 3) != 0); } c2 = c + (c c2 += c2 /* Load two constants: R6 = 0xfefefeff [ == ~(0x80808080 R5 = 0x80808080 */ asm (PRELOADSTR ("%0") "\n\ mov r5, #0x80\n\ add r5, r5, #0x8000\n\ add r5, r5, r5, lsl #16\n\ mvn r6, r5, lsl #1\n\ \n\ sub %0, %0, #4\n\ 0:\n\ ldr r1, [%0, #4]!\n\ " PRELOADSTR ("%0") "\n\ add r3, r1, r6\n\ bic r3, r3, r1\n\ ands r2, r3, r5\n\ bne 1f\n\ eor r2, r1, %1\n\ add r3, r2, r6\n\ bic r3, r3, r2\n\ ands r1, r3, r5\n\ beq 0b\n\ 1:" : "=&r" (s) : "r" (c2), "0" (s) : "r1", "r2", "r3", "r5", "r6", "cc"); #endif while (*s && *s != c) s++; if (*s == c) return (char *)s; return NULL; } #endif
