62 lines
2.5 KiB
ArmAsm
62 lines
2.5 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ 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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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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.source __FILE__
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tinymath_frexp:
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.leafprologue
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push %rbx
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push %rdx
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mov %rdi,%rbx
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movq %xmm0,%rax
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shr $52,%rax
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and $0x7ff,%eax
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jne 3f
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xorps %xmm1,%xmm1
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ucomisd %xmm1,%xmm0
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jp 1f
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je 2f
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1: mulsd 6f(%rip),%xmm0
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mov %rbx,%rdi
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call frexp
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subl $64,(%rbx)
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jmp 5f
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2: movl $0,(%rdi)
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jmp 5f
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3: cmp $0x7ff,%eax
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je 5f
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movq %xmm0,%rdx
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sub $0x3fe,%eax
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mov %eax,(%rdi)
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movabs $-9218868437227405313,%rax
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and %rax,%rdx
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mov $511,%eax
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sal $53,%rax
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or %rax,%rdx
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movq %rdx,%xmm0
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5: pop %rax
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pop %rbx
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.leafepilogue
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.endfn tinymath_frexp,globl
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.alias tinymath_frexp,frexp
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.rodata.cst8
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6: .long 0,0x43f00000
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