1997-04-05 03:26:47 +02:00
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/* ix87 specific frexp implementation for float.
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2000-08-17 09:36:19 +02:00
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Copyright (C) 1997, 2000 Free Software Foundation, Inc.
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1997-04-05 03:26:47 +02:00
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <machine/asm.h>
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2000-08-17 09:36:19 +02:00
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#include "bp-sym.h"
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#include "bp-asm.h"
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1997-04-05 03:26:47 +02:00
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#ifdef __ELF__
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.section .rodata
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#else
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.text
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#endif
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.align ALIGNARG(4)
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ASM_TYPE_DIRECTIVE(two25,@object)
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two25: .byte 0, 0, 0, 0x4c
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ASM_SIZE_DIRECTIVE(two25)
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#ifdef PIC
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#define MO(op) op##@GOTOFF(%edx)
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#else
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#define MO(op) op
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#endif
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2000-08-17 09:36:19 +02:00
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#define PARMS LINKAGE /* no space for saved regs */
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#define VAL PARMS
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#define EXPP VAL+4
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1997-04-05 03:26:47 +02:00
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.text
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2000-08-17 09:36:19 +02:00
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ENTRY (BP_SYM (__frexpf))
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ENTER
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movl VAL(%esp), %eax
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1997-04-05 03:26:47 +02:00
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xorl %ecx, %ecx
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movl %eax, %edx
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andl $0x7fffffff, %eax
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jz 1f
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cmpl $0x7f800000, %eax
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jae 1f
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cmpl $0x00800000, %eax
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jae 2f
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2000-08-17 09:36:19 +02:00
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flds VAL(%esp)
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1997-04-05 03:26:47 +02:00
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#ifdef PIC
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call 3f
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3: popl %edx
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addl $_GLOBAL_OFFSET_TABLE_+[.-3b], %edx
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#endif
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fmuls MO(two25)
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movl $-25, %ecx
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2000-08-17 09:36:19 +02:00
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fstps VAL(%esp)
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2000-12-02 19:22:43 +01:00
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fwait
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2000-08-17 09:36:19 +02:00
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movl VAL(%esp), %eax
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1997-04-05 03:26:47 +02:00
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movl %eax, %edx
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andl $0x7fffffff, %eax
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2: shrl $23, %eax
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andl $0x807fffff, %edx
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subl $126, %eax
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orl $0x3f000000, %edx
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addl %eax, %ecx
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2000-08-17 09:36:19 +02:00
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movl %edx, VAL(%esp)
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1997-04-05 03:26:47 +02:00
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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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2000-08-17 09:36:19 +02:00
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1: movl EXPP(%esp), %eax
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CHECK_BOUNDS_BOTH_WIDE (%eax, EXPP(%esp), $4)
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flds VAL(%esp)
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1997-04-05 03:26:47 +02:00
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movl %ecx, (%eax)
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2000-08-17 09:36:19 +02:00
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LEAVE
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1997-04-05 03:26:47 +02:00
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ret
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2000-08-17 09:36:19 +02:00
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END (BP_SYM (__frexpf))
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weak_alias (BP_SYM (__frexpf), BP_SYM (frexpf))
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