#include<stdio.h> #include<assert.h> int main() { int rt, ach, acl, dsp; int result; ach = 0x05; acl = 0xB4CB; result = 0x00007FFF; __asm ("mthi %2, $ac1\n\t" "mtlo %3, $ac1\n\t" "extr_s.h %0, $ac1, 0x03\n\t" "rddsp %1\n\t" : "=r"(rt), "=r"(dsp) : "r"(ach), "r"(acl) ); dsp = (dsp >> 23) & 0x01; assert(dsp == 1); assert(result == rt); ach = 0xffffffff; acl = 0x12344321; result = 0xFFFF8000; __asm ("mthi %2, $ac1\n\t" "mtlo %3, $ac1\n\t" "extr_s.h %0, $ac1, 0x08\n\t" "rddsp %1\n\t" : "=r"(rt), "=r"(dsp) : "r"(ach), "r"(acl) ); dsp = (dsp >> 23) & 0x01; assert(dsp == 1); assert(result == rt); /* Clear dsp */ dsp = 0; __asm ("wrdsp %0\n\t" : : "r"(dsp) ); ach = 0x00; acl = 0x4321; result = 0x432; __asm ("mthi %2, $ac1\n\t" "mtlo %3, $ac1\n\t" "extr_s.h %0, $ac1, 0x04\n\t" "rddsp %1\n\t" : "=r"(rt), "=r"(dsp) : "r"(ach), "r"(acl) ); dsp = (dsp >> 23) & 0x01; assert(dsp == 0); assert(result == rt); /* Clear dsp */ dsp = 0; __asm ("wrdsp %0\n\t" : : "r"(dsp) ); ach = 0x123; acl = 0x87654321; result = 0x1238; __asm ("mthi %2, $ac1\n\t" "mtlo %3, $ac1\n\t" "extr_s.h %0, $ac1, 28\n\t" "rddsp %1\n\t" : "=r"(rt), "=r"(dsp) : "r"(ach), "r"(acl) ); dsp = (dsp >> 23) & 0x01; assert(dsp == 0); assert(result == rt); return 0; }