3.74

/*
 * 3.74.c
 */
#include <stdio.h>
#include <assert.h>

typedef enum {NEG, ZERO, POS, OTHER} range_t;

range_t find_range(float x) {
  __asm__(
      "vxorps %xmm1, %xmm1, %xmm1\n\t"
      "movq $1, %rax\n\t"
      "movq $2, %r8\n\t"
      "movq $0, %r9\n\t"
      "movq $3, %r10\n\t"
      "vucomiss %xmm1, %xmm0\n\t"
      "cmovaq %r8, %rax\n\t"
      "cmovbq %r9, %rax\n\t"
      "cmovpq %r10, %rax\n\t"
      );
}

int main(int argc, char* argv[]) {
  range_t n = NEG, z = ZERO, p = POS, o = OTHER;
  assert(o == find_range(0.0/0.0));
  assert(n == find_range(-2.3));
  assert(z == find_range(0.0));
  assert(p == find_range(3.33));
  return 0;
}