riscv

an RV32I simulator and related experiments
git clone http://frotz.net/git/riscv.git
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hello.c (580B)

      1 #include "system.h"
      2 
      3 int main(int argc, char** argv) {
      4 	int top = 1000, bottom = -1000, ystep = 50;
      5 	int left = -2500, right = 1000, xstep = 30;
      6 	int maxiter = 1000;
      7 
      8 	for (int y0 = top; y0 > bottom; y0 -= ystep) {
      9 		for (int x0 = left; x0 < right; x0 += xstep) {
     10 			int i = 0, x = 0, y = 0, ch = ' ';
     11 			while (i < maxiter) {
     12 				int x2 = x * x / 1000;
     13 				int y2 = y * y / 1000;
     14 				if ((x2 + y2) > 4000) {
     15 					ch = (i > 9) ? '@' : (i + '0');
     16 					break;
     17 				}
     18 				y = 2 * x * y / 1000 + y0;
     19 				x = x2 - y2 + x0;
     20 				i++;
     21 			}
     22 			dputc(ch);
     23 		}
     24 		dputc('\n');
     25 	}
     26 	return 0;
     27 }