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 sw=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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2020-12-28 01:18:44 +00:00
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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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2020-06-15 14:18:57 +00:00
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│ │
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2020-12-28 01:18:44 +00:00
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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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2020-06-15 14:18:57 +00:00
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╚─────────────────────────────────────────────────────────────────────────────*/
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2021-03-01 07:42:35 +00:00
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#include "libc/macros.internal.h"
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2020-06-15 14:18:57 +00:00
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2021-03-02 21:57:23 +00:00
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// Returns largest integral not greater than 𝑥.
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//
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// @param 𝑥 is long double passed on stack
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// @return float scalar in low quarter of %xmm0
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floorl: pushq %rbp
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mov %rsp,%rbp
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sub $16,%rsp
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fnstcw -2(%rbp)
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fldt 16(%rbp)
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movzwl -2(%rbp),%eax
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and $-13,%ah
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or $4,%ah
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mov %ax,-4(%rbp)
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fldcw -4(%rbp)
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2020-06-15 14:18:57 +00:00
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frndint
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2021-03-02 21:57:23 +00:00
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fldcw -2(%rbp)
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leave
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2020-06-15 14:18:57 +00:00
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ret
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2021-02-01 02:25:16 +00:00
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.endfn floorl,globl
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