/* ix87 specific frexp implementation for double. Copyright (C) 1997, 2000, 2005 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ .file "frexp.s" .text .align 4 two54: .byte 0, 0, 0, 0, 0, 0, 0x50, 0x43 .p2align 4,,15 .globl _frexp .def _frexp; .scl 2; .type 32; .endef _frexp: movl 4(%esp), %ecx movl 8(%esp), %eax movl %eax, %edx andl $0x7fffffff, %eax orl %eax, %ecx jz 1f xorl %ecx, %ecx cmpl $0x7ff00000, %eax jae 1f cmpl $0x00100000, %eax jae 2f fld 4(%esp) fmull two54 movl $-54, %ecx fstpl 4(%esp) fwait movl 8(%esp), %eax movl %eax, %edx andl $0x7fffffff, %eax 2: shrl $20, %eax andl $0x800fffff, %edx subl $1022, %eax orl $0x3fe00000, %edx addl %eax, %ecx movl %edx, 8(%esp) /* Store %ecx in the variable pointed to by the second argument, get the factor from the stack and return. */ 1: movl 12(%esp), %eax fldl 4(%esp) movl %ecx, (%eax) ret