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