| /* | |
| * Written by J.T. Conklin <jtc@netbsd.org>. | |
| * Public domain. | |
| */ | |
| .file "ilogb.S" | |
| .text | |
| .align 4 | |
| .globl _ilogb | |
| .def _ilogb; .scl 2; .type 32; .endef | |
| _ilogb: | |
| fldl 4(%esp) | |
| /* I added the following ugly construct because ilogb(+-Inf) is | |
| required to return INT_MAX in ISO C99. | |
| -- jakub@redhat.com. */ | |
| fxam /* Is NaN or +-Inf? */ | |
| fstsw %ax | |
| movb $0x45, %dh | |
| andb %ah, %dh | |
| cmpb $0x05, %dh | |
| je 1f /* Is +-Inf, jump. */ | |
| fxtract | |
| pushq %rax | |
| fstp %st | |
| fistpl (%rsp) | |
| fwait | |
| popq %rax | |
| ret | |
| 1: fstp %st | |
| movl $0x7fffffff, %eax | |
| ret |