7 movl $0xc2820000,-4(%rsp)
12 # x*log2e <= -65, return -1 without underflow
44 cmpl $0xc67ff800,(%rsp)
46 movl $0x5f000000,(%rsp)
52 je 2f # x - 0x1p63 + 0x1p63 == x
54 flds (%rsp) # 0x1p-149
56 fstps (%rsp) # raise underflow
61 fsub %st(2) # st(0)=x-rint(x), st(1)=1, st(2)=rint(x)
80 fldt (%rsp) # 2^rint(x)