How to disable clang AddressSanitizer instrumentation for a function on FreeBSD?

Hi 
I'm trying to skip clang AddressSanitizer instrumentation for isMatch(void *ptr) function. How to do this on FreeBSD? 
My test program:
#include <string.h>#include <stdio.h>#include <stdlib.h>
 #define  PATTERN1   0x4ffcf694 static unsigned char pattern1[] = {0x4f,0xfc,0xf6,0x94};

__attribute__((no_sanitize("address"))) int isMatch(void *ptr);
int main(int argc, char *argv[]){ int rv = 0; void *ptr = NULL;
 ptr = malloc(4); if (!ptr)    {     printf("No memory.");     exit(1);    }  /* Copy PATTERN1 marker to the allocated block */ memcpy(ptr, pattern1, sizeof(pattern1));
 /*  TEST 1: Correct case. */ printf("TEST 1: Correct case.\n"); rv = isMatch(ptr); if (rv == 1)    printf("Matched\n"); else    printf("NOT Matched\n");

 /*  TEST 2: ptr - 1000 */ printf("TEST 2: ptr - 1000\n"); rv = isMatch(ptr - 1000); if (rv == 1)    printf("Matched\n"); else    printf("NOT Matched\n");
}
__attribute__((no_sanitize("address"))) int isMatch(void *ptr){ if ((memcmp(ptr, (void *)pattern1, sizeof(pattern1)) == 0))    return 1;  return 0;}

/usr/local/bin/clang13 prog.c -O1 -g -fsanitize=address -fno-omit-frame-pointer -Wall -O -I. -I/usr/local/include -L. -L/usr/local/lib -o prog

When run I get following:./progTEST 1: Correct case.MatchedTEST 2: ptr - 1000AddressSanitizer:DEADLYSIGNAL===================================================================29072==ERROR: AddressSanitizer: SEGV on unknown address 0x601ffff00010 (pc 0x0000002bb794 bp 0x7fffffffea30 sp 0x7fffffffea30 T0)==29072==The signal is caused by a READ memory access.    #0 0x2bb794 in isMatch path/prog.c:67:7    #1 0x2bb73e in main path/prog.c:56:7    #2 0x236d3f in _start /usr/src/lib/csu/amd64/crt1_c.c:75:7    #3 0x8002e2007  (<unknown module>)
AddressSanitizer can not provide additional info.SUMMARY: AddressSanitizer: SEGV path/prog.c:67:7 in isMatch==29072==ABORTING
Appreciate any help.
Best regardsSagara