7u83/stc_rpncalc
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modify code to use accumulator architecture to minimize pointer usage

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This commit is contained in:
Jeff Wang
2019-05-01 03:51:29 -04:00
parent 96c762aeed
commit 6399cbf44f
8 changed files with 339 additions and 276 deletions
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14
src/calc.c
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@ -7,6 +7,8 @@
#include "decn/decn.h"
#include "utils.h"
#include "calc.h"
#define STACK_SIZE 4 //must be a power of 2
#define STACK_X 0
@ -29,7 +31,7 @@ void push_decn(const char* signif_str, exp_t exponent, uint8_t no_lift){
if (!no_lift){
StackPtr--;
}
build_dec80(&stack(STACK_X), signif_str, exponent);
set_x(signif_str, exponent);
}
void clear_x(void){
@ -37,7 +39,8 @@ void clear_x(void){
}
void set_x(const char* signif_str, exp_t exponent){
build_dec80(&stack(STACK_X), signif_str, exponent);
build_dec80(signif_str, exponent);
copy_decn(&stack(STACK_X), &AccDecn);
}
__xdata dec80* get_x(void){
@ -47,11 +50,14 @@ __xdata dec80* get_y(void){
return &stack(STACK_Y);
}
static void do_binary_op(void (*f_ptr)(dec80*, const dec80*)){
static void do_binary_op(void (*f_ptr)(void)){
if (decn_is_nan(&stack(STACK_Y)) || decn_is_nan(&stack(STACK_X))){
set_dec80_NaN(&stack(STACK_Y));
} else {
f_ptr(&stack(STACK_Y), &stack(STACK_X));
copy_decn(&AccDecn, &stack(STACK_Y));
copy_decn(&BDecn, &stack(STACK_X));
f_ptr();
copy_decn(&stack(STACK_Y), &AccDecn);
}
pop();
}