glibc/sysdeps/x86_64/fpu/s_copysignl.S

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ArmAsm
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/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Changes for long double by Ulrich Drepper <drepper@cygnus.com>.
* Adopted for x86-64 by Andreas Jaeger <aj@suse.de>.
* Public domain.
*/
#include <machine/asm.h>
RCSID("$NetBSD: $")
ENTRY(__copysignl)
movl 32(%rsp),%edx
movl 16(%rsp),%eax
andl $0x8000,%edx
andl $0x7fff,%eax
orl %edx,%eax
movl %eax,16(%rsp)
fldt 8(%rsp)
ret
END (__copysignl)
weak_alias (__copysignl, copysignl)