source: vbox/trunk/src/libs/softfloat-3e/source/include/opts-GCC.h

/*============================================================================

This C header file is part of the SoftFloat IEEE Floating-Point Arithmetic
Package, Release 3e, by John R. Hauser.

Copyright 2017 The Regents of the University of California.  All rights
reserved.

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.

 3. Neither the name of the University nor the names of its contributors may
    be used to endorse or promote products derived from this software without
    specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.

=============================================================================*/

#ifndef opts_GCC_h
#define opts_GCC_h 1

#ifdef INLINE

#include <stdint.h>
#include "primitiveTypes.h"

#ifdef SOFTFLOAT_BUILTIN_CLZ

INLINE uint_fast8_t softfloat_countLeadingZeros16( uint16_t a )
    { return a ? __builtin_clz( a ) - 16 : 16; }
#define softfloat_countLeadingZeros16 softfloat_countLeadingZeros16

INLINE uint_fast8_t softfloat_countLeadingZeros32( uint32_t a )
    { return a ? __builtin_clz( a ) : 32; }
#define softfloat_countLeadingZeros32 softfloat_countLeadingZeros32

INLINE uint_fast8_t softfloat_countLeadingZeros64( uint64_t a )
    { return a ? __builtin_clzll( a ) : 64; }
#define softfloat_countLeadingZeros64 softfloat_countLeadingZeros64

#endif

#ifdef SOFTFLOAT_INTRINSIC_INT128

#include <iprt/cdefs.h> /* VBox: shut up pedantic warnings */
RT_GCC_EXTENSION typedef unsigned __int128  softfloat_int128_t;

INLINE struct uint128 softfloat_mul64ByShifted32To128( uint64_t a, uint32_t b )
{
    union { softfloat_int128_t ui; struct uint128 s; } uZ;
    uZ.ui = (softfloat_int128_t) a * ((uint_fast64_t) b<<32);
    return uZ.s;
}
#define softfloat_mul64ByShifted32To128 softfloat_mul64ByShifted32To128

INLINE struct uint128 softfloat_mul64To128( uint64_t a, uint64_t b )
{
    union { softfloat_int128_t ui; struct uint128 s; } uZ;
    uZ.ui = (softfloat_int128_t) a * b;
    return uZ.s;
}
#define softfloat_mul64To128 softfloat_mul64To128

INLINE
struct uint128 softfloat_mul128By32( uint64_t a64, uint64_t a0, uint32_t b )
{
    union { softfloat_int128_t ui; struct uint128 s; } uZ;
    uZ.ui = ((softfloat_int128_t) a64<<64 | a0) * b;
    return uZ.s;
}
#define softfloat_mul128By32 softfloat_mul128By32

INLINE
void
 softfloat_mul128To256M(
     uint64_t a64, uint64_t a0, uint64_t b64, uint64_t b0, uint64_t *zPtr )
{
    softfloat_int128_t z0, mid1, mid, z128;
    z0 = (softfloat_int128_t) a0 * b0;
    mid1 = (softfloat_int128_t) a64 * b0;
    mid = mid1 + (softfloat_int128_t) a0 * b64;
    z128 = (softfloat_int128_t) a64 * b64;
    z128 += (softfloat_int128_t) (mid < mid1)<<64 | mid>>64;
    mid <<= 64;
    z0 += mid;
    z128 += (z0 < mid);
    zPtr[indexWord( 4, 0 )] = z0;
    zPtr[indexWord( 4, 1 )] = z0>>64;
    zPtr[indexWord( 4, 2 )] = z128;
    zPtr[indexWord( 4, 3 )] = z128>>64;
}
#define softfloat_mul128To256M softfloat_mul128To256M

#endif

#endif

#endif