2020-06-16 13:38:43 +00:00
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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2020-06-15 14:18:57 +00:00
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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 "ape/lib/pc.h"
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#include "libc/macros.h"
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2020-06-16 02:01:28 +00:00
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.source __FILE__
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2020-06-15 14:18:57 +00:00
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tinymath_lroundl:
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push %rbp
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mov %rsp,%rbp
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.profilable
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push %rax
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push %rax
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fldt 16(%rbp)
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fnstcw -8(%rbp)
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movzwl -8(%rbp),%edx
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and $0b11110011,%dh # RC (Rounding Control)
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or $0b00000100,%dh # →-∞
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mov %dx,-4(%rbp)
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fxam
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fnstsw %ax
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fabs
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test $FPU_C1>>8,%ah
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fadds .Lhalf(%rip)
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fldcw -4(%rbp)
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fistpq -16(%rbp)
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fldcw -8(%rbp)
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mov -16(%rbp),%rax
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je 1f
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neg %rax
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1: leave
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ret
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.endfn tinymath_lroundl,globl
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.alias tinymath_lroundl,lroundl
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.alias tinymath_lroundl,llroundl
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.rodata.cst4
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.Lhalf: .float .5
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