/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8     -*-│
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8                                     :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/runtime/pc.internal.h"
#include "libc/macros.internal.h"

//	Computes transcedental trigonometry op w/ reactive scaling.
//
//	@param	%rdx points to op function
//	@param	everything else delegates
//	@clob	%ax
//	@see	sin,cos,tan
c2rangr:push	%rbp
	mov	%rsp,%rbp
	.profilable
	call	*%rdx
	fstsw	%ax
	test	$FPU_C2>>8,%ah
	jnz	1f
0:	pop	%rbp
	ret
1:	fldpi
	fadd	%st
	fxch
2:	fprem1
	fnstsw
	test	$FPU_C2>>8,%ah
	jnz	2b
	fstp	%st(1)
	call	*%rdx
	jmp	0b
	.endfn	c2rangr,globl,hidden
