1 #include <stdio.h> 2 #include <ctype.h> 3 #include "test.h" 4 5 #define LOOPBACK "jo 0b \n\t" 6 7 typedef struct { 8 const char *str1; 9 const char *str2; 10 int cc; 11 } clst_t; 12 13 static clst_t 14 do_clst(const char *__string1, const char *__string2, char __end) 15 { 16 register char end asm ("0") = __end; 17 register const char *string1 asm ("2") = __string1; 18 register const char *string2 asm ("4") = __string2; 19 20 asm volatile( "0: clst 2,4\n\t" 21 LOOPBACK 22 :"+d" (string1), "+d" (string2) :"d" (end): "cc"); 23 24 return (clst_t) { .str1 = string1, .str2 = string2, .cc = get_cc() }; 25 } 26 27 void 28 clst(const char *str1, const char *str2, int sentinel) 29 { 30 clst_t res; 31 32 printf("comparing: %s with %s sentinel = %d", str1, str2, sentinel); 33 if (isprint(sentinel)) 34 printf(" (%c)", sentinel); 35 printf("\n"); 36 res = do_clst(str1, str2, sentinel); 37 printf("str1 = %s\nstr2 = %s\ncc = %d\n", res.str1, res.str2, res.cc); 38 printf("\n"); 39 } 40 41 int main(void) 42 { 43 clst("lower123", "lowerabc", '\0'); 44 clst("higher234", "higher123", '\0'); 45 clst("equal", "equal", '\0'); 46 47 clst("equal", "equallong", '\0'); 48 clst("equallong", "equal", '\0'); 49 50 clst("lower1", "lower2", 'w'); // will compare equal 51 52 return 0; 53 } 54
