mirror of
https://github.com/jart/cosmopolitan.git
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fdc3fa9148
The libm code from musl wasn't being used since most of these functions are implemented using x87 which goes faster than a library intended for risc machines.
58 lines
2.4 KiB
ArmAsm
58 lines
2.4 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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.source __FILE__
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frexp: .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 frexp,globl
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.rodata.cst8
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6: .long 0,0x43f00000
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