/*-
 * Copyright (c) 2013 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matt Thomas of 3am Software Foundry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <mips/asm.h>

RCSID("$NetBSD: fpdf.S,v 1.1 2016/07/14 01:59:18 matt Exp $")

/*
 * This file provides softfloat compatible routines which use FP instructions
 * to do the actual work.  This should give near hard-float performance while
 * being compatible with soft-float code.
 *
 * This file implements the double precision floating point routines.
 */

#ifdef MIPS3
#define COP1_SYNC       nop
#else
#define COP1_SYNC
#endif

LEAF_NOPROFILE(__adddf3)
        dmtc1           a0, $f12
        dmtc1           a1, $f14
        COP1_SYNC
        add.d           $f0, $f12, $f14
        dmfc1           v0, $f0
        jr              ra
END(__adddf3)

LEAF_NOPROFILE(__subdf3)
        dmtc1           a0, $f12
        dmtc1           a1, $f14
        COP1_SYNC
        sub.d           $f0, $f12, $f14
        dmfc1           v0, $f0
        jr              ra
END(__subdf3)

LEAF_NOPROFILE(__muldf3)
        dmtc1           a0, $f12
        dmtc1           a1, $f14
        COP1_SYNC
        mul.d           $f0, $f12, $f14
        dmfc1           v0, $f0
        jr              ra
END(__muldf3)

LEAF_NOPROFILE(__divdf3)
        dmtc1           a0, $f12
        dmtc1           a1, $f14
        COP1_SYNC
        div.d           $f0, $f12, $f14
        dmfc1           v0, $f0
        jr              ra
END(__divdf3)

LEAF_NOPROFILE(__negdf2)
        dmtc1           a0, $f12
        COP1_SYNC
        neg.d           $f0, $f12
        dmfc1           v0, $f0
        jr              ra
END(__negdf2)

LEAF_NOPROFILE(__extendsfdf2)
        dmtc1           a0, $f12
        COP1_SYNC
        cvt.d.s         $f0, $f12
        dmfc1           v0, $f0
        jr              ra
END(__extendsfdf2)

LEAF_NOPROFILE(__fixdfdi)
        dmtc1           a0, $f12
        COP1_SYNC
        trunc.l.d       $f0, $f12
        dmfc1           v0, $f0
        jr              ra
END(__fixdfdi)

LEAF_NOPROFILE(__fixdfsi)
        dmtc1           a0, $f12
        COP1_SYNC
        trunc.w.d       $f0, $f12
        mfc1            v0, $f0
        jr              ra
END(__fixdfsi)

LEAF_NOPROFILE(__fixunsdfdi)
        lui             t0, 0x43e0      # 9223372036854775808.0
        dsll            t0, t0, 32
        mtc1            t0, $f0
        mtc1            a0, $f12
        COP1_SYNC
        sub.d           $f0, $f12, $f0  # convert to signed 
        trunc.l.d       $f0, $f0
        dmfc1           v0, $f0
        li              v1, 1
        dsll            v1, v1, 63
        add             v0, v0, v1      # convert to unsigned
        jr              ra
END(__fixunsdfdi)

LEAF_NOPROFILE(__fixunsdfsi)
        lui             t0, 0x41e0      # 2147483648.0
        dsll            t0, t0, 32
        mtc1            t0, $f0
        mtc1            a0, $f12
        COP1_SYNC
        sub.d           $f0, $f12, $f0  # convert to signed 
        trunc.w.d       $f0, $f0
        lui             v1, 0x8000      # 0xffffffff80000000
        mfc1            v0, $f0
        add             v0, v0, v1      # convert to unsigned
        jr              ra
END(__fixunsdfsi)

LEAF_NOPROFILE(__floatdidf)
        dmtc1           a0, $f12
        COP1_SYNC
        cvt.d.l         $f0, $f12
        dmfc1           v0, $f0
        jr              ra
END(__floatdidf)

LEAF_NOPROFILE(__floatsidf)
        mtc1            a0, $f12
        COP1_SYNC
        cvt.d.w         $f0, $f12
        dmfc1           v0, $f0
        jr              ra
END(__floatsidf)

LEAF_NOPROFILE(__floatundidf)
        li              t0, 1
        dsll            t0, t0, 63
        dsub            a0, a0, t0
        dmtc1           a0, $f12
        dmtc1           t0, $f14
        COP1_SYNC
        cvt.d.l         $f0, $f12
        cvt.d.l         $f2, $f14
        add.d           $f0, $f0, $f2
        dmfc1           v0, $f0 
        jr              ra
END(__floatundidf)

LEAF_NOPROFILE(__floatunsidf)
        sll             a0, a0, 0
        dmtc1           a0, $f12
        COP1_SYNC
        cvt.d.l         $f0, $f12
        dmfc1           v0, $f0 
        jr              ra
END(__floatunsidf)

STRONG_ALIAS(__eqdf2, __nedf2)
LEAF_NOPROFILE(__nedf2)
        .set push
        .set noreorder
        dmtc1           a0, $f12
        dmtc1           a1, $f14
        COP1_SYNC
        c.eq.d          $f12, $f14
        bc1f            2f
         li             v0, 1
        move            v0, zero
2:      jr              ra
         nop
        .set pop
END(__nedf2)

STRONG_ALIAS(__gedf2, __ltdf2)
LEAF_NOPROFILE(__ltdf2)
        .set push
        .set noreorder
        dmtc1           a0, $f12
        dmtc1           a1, $f14
        COP1_SYNC
        c.olt.d         $f12, $f14
        bc1t            2f
         li             v0, -1
        move            v0, zero
2:      jr              ra
         nop
        .set pop
END(__ltdf2)

STRONG_ALIAS(__gtdf2, __ledf2)
LEAF_NOPROFILE(__ledf2)
        .set push
        .set noreorder
        dmtc1           a0, $f12
        dmtc1           a1, $f14
        COP1_SYNC
        c.ole.d         $f12, $f14
        bc1f            2f
         li             v0, 1
        move            v0, zero
2:      jr              ra
         nop
        .set pop
END(__ledf2)

LEAF_NOPROFILE(__unorddf2)
        .set push
        .set noreorder
        dmtc1           a0, $f12
        dmtc1           a1, $f14
        COP1_SYNC
        c.un.d          $f12, $f14
        bc1t            2f
         li             v0, 1
        move            v0, zero
2:      jr              ra
         nop
        .set pop
END(__unorddf2)