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84 lines
1.9 KiB
ArmAsm
84 lines
1.9 KiB
ArmAsm
/* ix87 specific frexp implementation for double.
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Copyright (C) 1997-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, see
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<https://www.gnu.org/licenses/>. */
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#include <machine/asm.h>
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#include <libm-alias-double.h>
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.section .rodata
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.align ALIGNARG(4)
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.type two54,@object
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two54: .byte 0, 0, 0, 0, 0, 0, 0x50, 0x43
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ASM_SIZE_DIRECTIVE(two54)
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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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#define PARMS 4 /* no space for saved regs */
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#define VAL0 PARMS
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#define VAL1 VAL0+4
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#define EXPP VAL1+4
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.text
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ENTRY (__frexp)
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movl VAL0(%esp), %ecx
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movl VAL1(%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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fldl VAL0(%esp)
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#ifdef PIC
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LOAD_PIC_REG (dx)
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#endif
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fmull MO(two54)
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movl $-54, %ecx
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fstpl VAL0(%esp)
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fwait
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movl VAL1(%esp), %eax
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movl %eax, %edx
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andl $0x7fffffff, %eax
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2: 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, VAL1(%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: movl EXPP(%esp), %eax
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fldl VAL0(%esp)
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movl %ecx, (%eax)
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ret
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END (__frexp)
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libm_alias_double (__frexp, frexp)
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