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.global atan
.type atan,@function
atan:
fldl 4(%esp)
mov 8(%esp),%eax
add %eax,%eax
cmp $0x00200000,%eax
jb 1f
fld1
fpatan
fstpl 4(%esp)
fldl 4(%esp)
ret
# subnormal x, return x with underflow
1: fsts 4(%esp)
ret
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