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      1 /* $NetBSD: qp.c,v 1.4 2022/10/05 10:28:19 nia Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 #include <sys/cdefs.h>
     32 
     33 #include "milieu.h"
     34 #include "softfloat.h"
     35 
     36 /*
     37  * This file provides wrappers for the softfloat functions.  We can't use
     38  * invoke them directly since long double arguments are passed in FP/SIMD
     39  * as well as being returned in them while float128 arguments are passed
     40  * in normal registers.
     41  *
     42  * XXX: we're using compiler_rt for this now. Only one function remains
     43  * that is missing from compiler_rt.
     44  */
     45 
     46 long double __negtf2(long double);
     47 
     48 union sf_ieee_flt_u {
     49 	float fltu_f;
     50 	float32 fltu_f32;
     51 };
     52 
     53 union sf_ieee_dbl_u {
     54 	double dblu_d;
     55 	float64 dblu_f64;
     56 };
     57 
     58 union sf_ieee_ldbl_u {
     59 	long double ldblu_ld;
     60 	float128 ldblu_f128;
     61 };
     62 
     63 long double
     64 __negtf2(long double ld_a)
     65 {
     66 	const union sf_ieee_ldbl_u zero = { .ldblu_ld = 0.0 };
     67 	const union sf_ieee_ldbl_u a = { .ldblu_ld = ld_a };
     68 	const union sf_ieee_ldbl_u b = {
     69 	    .ldblu_f128 = float128_div(zero.ldblu_f128, a.ldblu_f128)
     70 	};
     71 
     72 	return b.ldblu_ld;
     73 }
     74