clang/test/CodeGen/mandel.c

   1 // RUN: %clang_cc1 -emit-llvm %s -o %t
   2
   3 /* Sparc is not C99-compliant */
   4 #if defined(sparc) || defined(__sparc__) || defined(__sparcv9)
   5
   6 int main(void) { return 0; }
   7
   8 #else /* sparc */
   9
  10 #define ESCAPE 2
  11 #define IMAGE_WIDTH 150
  12 #define IMAGE_HEIGHT 50
  13 #if 1
  14 #define IMAGE_SIZE 60
  15 #else
  16 #define IMAGE_SIZE 5000
  17 #endif
  18 #define START_X -2.1
  19 #define END_X 1.0
  20 #define START_Y -1.25
  21 #define MAX_ITER 100
  22
  23 #define step_X ((END_X - START_X)/IMAGE_WIDTH)
  24 #define step_Y ((-START_Y - START_Y)/IMAGE_HEIGHT)
  25
  26 #define I 1.0iF
  27
  28 int putchar(char c);
  29 double hypot(double, double);
  30
  31 volatile double __complex__ accum;
  32
  33 void mandel(void) {
  34   int x, y, n;
  35   for (y = 0; y < IMAGE_HEIGHT; ++y) {
  36     for (x = 0; x < IMAGE_WIDTH; ++x) {
  37       double __complex__ c = (START_X+x*step_X) + (START_Y+y*step_Y) * I;
  38       double __complex__ z = 0.0;
  39
  40       for (n = 0; n < MAX_ITER; ++n) {
  41         z = z * z + c;
  42         if (hypot(__real__ z, __imag__ z) >= ESCAPE)
  43           break;
  44       }
  45
  46       if (n == MAX_ITER)
  47         putchar(' ');
  48       else if (n > 6)
  49         putchar('.');
  50       else if (n > 3)
  51         putchar('+');
  52       else if (n > 2)
  53         putchar('x');
  54       else
  55         putchar('*');
  56     }
  57     putchar('\n');
  58   }
  59 }
  60
  61 int main(void) {
  62   mandel();
  63   return 0;
  64 }
  65
  66 #endif /* sparc */