mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +00:00
81 lines
1.8 KiB
ArmAsm
81 lines
1.8 KiB
ArmAsm
/* ix87 specific frexp implementation for float.
|
|
Copyright (C) 1997-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <machine/asm.h>
|
|
#include <libm-alias-float.h>
|
|
|
|
.section .rodata
|
|
|
|
.align ALIGNARG(4)
|
|
.type two25,@object
|
|
two25: .byte 0, 0, 0, 0x4c
|
|
ASM_SIZE_DIRECTIVE(two25)
|
|
|
|
#ifdef PIC
|
|
#define MO(op) op##@GOTOFF(%edx)
|
|
#else
|
|
#define MO(op) op
|
|
#endif
|
|
|
|
#define PARMS 4 /* no space for saved regs */
|
|
#define VAL PARMS
|
|
#define EXPP VAL+4
|
|
|
|
.text
|
|
ENTRY (__frexpf)
|
|
|
|
movl VAL(%esp), %eax
|
|
xorl %ecx, %ecx
|
|
movl %eax, %edx
|
|
andl $0x7fffffff, %eax
|
|
jz 1f
|
|
cmpl $0x7f800000, %eax
|
|
jae 1f
|
|
|
|
cmpl $0x00800000, %eax
|
|
jae 2f
|
|
|
|
flds VAL(%esp)
|
|
#ifdef PIC
|
|
LOAD_PIC_REG (dx)
|
|
#endif
|
|
fmuls MO(two25)
|
|
movl $-25, %ecx
|
|
fstps VAL(%esp)
|
|
fwait
|
|
movl VAL(%esp), %eax
|
|
movl %eax, %edx
|
|
andl $0x7fffffff, %eax
|
|
|
|
2: shrl $23, %eax
|
|
andl $0x807fffff, %edx
|
|
subl $126, %eax
|
|
orl $0x3f000000, %edx
|
|
addl %eax, %ecx
|
|
movl %edx, VAL(%esp)
|
|
|
|
/* Store %ecx in the variable pointed to by the second argument,
|
|
get the factor from the stack and return. */
|
|
1: movl EXPP(%esp), %eax
|
|
flds VAL(%esp)
|
|
movl %ecx, (%eax)
|
|
|
|
ret
|
|
END (__frexpf)
|
|
libm_alias_float (__frexp, frexp)
|