static inline Value *
arch_6502_pull16(cpu_t *cpu, BasicBlock *bb)
{
Value *lo = PULL;
Value *hi = PULL;
return (OR(ZEXT16(lo), SHL(ZEXT16(hi), CONST16(8))));
}
// adds src + v + c and stores it in dst
Value *
arch_adc(cpu_t *cpu, Value *dst, Value *src, Value *v, bool plus_carry, bool plus_one, BasicBlock *bb)
{
Value *c;
if (plus_carry)
c = LOAD(cpu->ptr_C);
else if (plus_one)
c = CONST1(1);
else
c = CONST1(0);
if (SIZE(v) == 8) {
/* calculate intermediate result */
Value *v1 = ADD(ADD(ZEXT16(LOAD(src)), ZEXT16(v)), ZEXT16(c));
/* get C */
STORE(TRUNC1(LSHR(v1, CONST16(8))), cpu->ptr_C);
/* get result */
v1 = TRUNC8(v1);
if (dst)
STORE(v1, dst);
return v1;
} else {
//XXX TODO use llvm.uadd.with.overflow.*
//XXX consider using it for 8 bit also, if possible
printf("TODO: %s() can't do anything but 8 bits yet!\n", __func__);
exit(1);
}
}
