src/math/i386/atan2.s

   1 .global atan2
   2 .type atan2,@function
   3 atan2:
   4         fldl 4(%esp)
   5         fldl 12(%esp)
   6         fpatan
   7         fstl 4(%esp)
   8         mov 8(%esp),%eax
   9         add %eax,%eax
  10         cmp $0x00200000,%eax
  11         jae 1f
  12                 # subnormal x, return x with underflow
  13         fnstsw %ax
  14         and $16,%ax
  15         jnz 1f
  16         fsts 4(%esp)
  17 1:      ret