7u83/stc_rpncalc
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

more comments

Browse Source
This commit is contained in:
Jeff Wang 2019-09-24 00:11:51 -04:00
parent 4f020da222
commit 6eb48de844
1 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/decn/decn.c
View File

@ -657,6 +657,8 @@ void add_decn(void){
} }
} }
//AccDecn *= BDecn
// (the BDecn register is preserved)
void mult_decn(void){ void mult_decn(void){
int8_t i, j; int8_t i, j;
uint8_t carry = 0; uint8_t carry = 0;
@ -801,30 +803,35 @@ void div_decn(void){
decn_to_str_complete(&curr_recip); decn_to_str_complete(&curr_recip);
printf("%2d: %s\n", i, Buf); printf("%2d: %s\n", i, Buf);
#endif #endif
//Accum *= x_copy
copy_decn(&BDecn, &X_COPY); copy_decn(&BDecn, &X_COPY);
mult_decn(); mult_decn();
#ifdef DEBUG_DIV #ifdef DEBUG_DIV
decn_to_str_complete(&AccDecn); decn_to_str_complete(&AccDecn);
printf(" %20s: %s\n", "recip*x", Buf); printf(" %20s: %s\n", "recip*x", Buf);
#endif #endif
//Accum *= -1
negate_decn(&AccDecn); negate_decn(&AccDecn);
//Accum += 1
copy_decn(&BDecn, &DECN_1); copy_decn(&BDecn, &DECN_1);
add_decn(); add_decn();
#ifdef DEBUG_DIV #ifdef DEBUG_DIV
decn_to_str_complete(&AccDecn); decn_to_str_complete(&AccDecn);
printf(" %20s: %s\n", "(1-recip*x)", Buf); printf(" %20s: %s\n", "(1-recip*x)", Buf);
#endif #endif
//Accum *= curr_recip
copy_decn(&BDecn, &CURR_RECIP); copy_decn(&BDecn, &CURR_RECIP);
mult_decn(); mult_decn();
#ifdef DEBUG_DIV #ifdef DEBUG_DIV
decn_to_str_complete(&AccDecn); decn_to_str_complete(&AccDecn);
printf(" %20s: %s\n", "recip * (1-recip*x)", Buf); printf(" %20s: %s\n", "recip * (1-recip*x)", Buf);
#endif #endif
//Accum += curr_recip
add_decn(); add_decn();
//new_est(acc) = recip + (1 - recip*x)*recip, where tmp is current recip estimate //new_est(Accum) = recip + (1 - recip*x)*recip, where recip is current recip estimate
copy_decn(&CURR_RECIP, &AccDecn); copy_decn(&CURR_RECIP, &AccDecn);
} }
//acc now holds 1/x, multiply by original acc to complete division //Accum now holds 1/x, multiply by original acc to complete division
copy_decn(&BDecn, &ACC_COPY); copy_decn(&BDecn, &ACC_COPY);
mult_decn(); mult_decn();