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

//	Support code for fast integer division by Si units.
//
//	Division by magnums is described in Hacker's Delight and is
//	usually generated automatically by compilers, but sadly not
//	when we optimize for size and idiv goes at least 10x slower
//	so we do this which saves space while avoiding build tuning
//
//	@param	rdi is number to divide
//	@param	cl is magnum #1
//	@param	rdx is magnum #2
//	@return	quotient
tinydivsi:
	.leafprologue
	mov	%rdi,%rax
	imul	%rdx
	mov	%rdx,%rax
	sar	%cl,%rax
	sar	$63,%rdi
	sub	%rdi,%rax
	.leafepilogue
	.endfn	tinydivsi,globl
