?? s_ilogbl.s
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/* * Written by J.T. Conklin <jtc@netbsd.org>. * Changes for long double by Ulrich Drepper <drepper@cygnus.com> * Adapted for x86-64 by Andreas Jaeger <aj@suse.de>. * Public domain. */#include <machine/asm.h>ENTRY(__ilogbl) fldt 8(%rsp)/* 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 fstp %st fistpl -4(%rsp) fwait movl -4(%rsp),%eax ret1: fstp %st movl $0x7fffffff, %eax retEND (__ilogbl)weak_alias (__ilogbl, ilogbl)
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