source: vbox/trunk/src/libs/softfloat-3e/testfloat/source/genCases_ui32.c

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

This C source file is part of TestFloat, Release 3e, a package of programs for
testing the correctness of floating-point arithmetic complying with the IEEE
Standard for Floating-Point, by John R. Hauser.

Copyright 2011, 2012, 2013, 2014 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.

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

#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "random.h"
#include "genCases.h"

struct sequence {
    int term1Num, term2Num;
    bool done;
};

enum { ui32NumP1 = 124 };
static const uint32_t ui32P1[ui32NumP1] = {
    0x00000000,
    0x00000001,
    0x00000002,
    0x00000004,
    0x00000008,
    0x00000010,
    0x00000020,
    0x00000040,
    0x00000080,
    0x00000100,
    0x00000200,
    0x00000400,
    0x00000800,
    0x00001000,
    0x00002000,
    0x00004000,
    0x00008000,
    0x00010000,
    0x00020000,
    0x00040000,
    0x00080000,
    0x00100000,
    0x00200000,
    0x00400000,
    0x00800000,
    0x01000000,
    0x02000000,
    0x04000000,
    0x08000000,
    0x10000000,
    0x20000000,
    0x40000000,
    0x80000000,
    0xC0000000,
    0xE0000000,
    0xF0000000,
    0xF8000000,
    0xFC000000,
    0xFE000000,
    0xFF000000,
    0xFF800000,
    0xFFC00000,
    0xFFE00000,
    0xFFF00000,
    0xFFF80000,
    0xFFFC0000,
    0xFFFE0000,
    0xFFFF0000,
    0xFFFF8000,
    0xFFFFC000,
    0xFFFFE000,
    0xFFFFF000,
    0xFFFFF800,
    0xFFFFFC00,
    0xFFFFFE00,
    0xFFFFFF00,
    0xFFFFFF80,
    0xFFFFFFC0,
    0xFFFFFFE0,
    0xFFFFFFF0,
    0xFFFFFFF8,
    0xFFFFFFFC,
    0xFFFFFFFE,
    0xFFFFFFFF,
    0xFFFFFFFD,
    0xFFFFFFFB,
    0xFFFFFFF7,
    0xFFFFFFEF,
    0xFFFFFFDF,
    0xFFFFFFBF,
    0xFFFFFF7F,
    0xFFFFFEFF,
    0xFFFFFDFF,
    0xFFFFFBFF,
    0xFFFFF7FF,
    0xFFFFEFFF,
    0xFFFFDFFF,
    0xFFFFBFFF,
    0xFFFF7FFF,
    0xFFFEFFFF,
    0xFFFDFFFF,
    0xFFFBFFFF,
    0xFFF7FFFF,
    0xFFEFFFFF,
    0xFFDFFFFF,
    0xFFBFFFFF,
    0xFF7FFFFF,
    0xFEFFFFFF,
    0xFDFFFFFF,
    0xFBFFFFFF,
    0xF7FFFFFF,
    0xEFFFFFFF,
    0xDFFFFFFF,
    0xBFFFFFFF,
    0x7FFFFFFF,
    0x3FFFFFFF,
    0x1FFFFFFF,
    0x0FFFFFFF,
    0x07FFFFFF,
    0x03FFFFFF,
    0x01FFFFFF,
    0x00FFFFFF,
    0x007FFFFF,
    0x003FFFFF,
    0x001FFFFF,
    0x000FFFFF,
    0x0007FFFF,
    0x0003FFFF,
    0x0001FFFF,
    0x0000FFFF,
    0x00007FFF,
    0x00003FFF,
    0x00001FFF,
    0x00000FFF,
    0x000007FF,
    0x000003FF,
    0x000001FF,
    0x000000FF,
    0x0000007F,
    0x0000003F,
    0x0000001F,
    0x0000000F,
    0x00000007,
    0x00000003
};

static uint32_t ui32NextP1( struct sequence *sequencePtr )
{
    int termNum;
    uint32_t z;

    termNum = sequencePtr->term1Num;
    z = ui32P1[termNum];
    ++termNum;
    if ( ui32NumP1 <= termNum ) {
        termNum = 0;
        sequencePtr->done = true;
    }
    sequencePtr->term1Num = termNum;
    return z;

}

static const uint_fast32_t ui32NumP2 = (ui32NumP1 * ui32NumP1 + ui32NumP1) / 2;

static uint32_t ui32NextP2( struct sequence *sequencePtr )
{
    int term1Num, term2Num;
    uint32_t z;

    term2Num = sequencePtr->term2Num;
    term1Num = sequencePtr->term1Num;
    z = ui32P1[term1Num] + ui32P1[term2Num];
    ++term2Num;
    if ( ui32NumP1 <= term2Num ) {
        ++term1Num;
        if ( ui32NumP1 <= term1Num ) {
            term1Num = 0;
            sequencePtr->done = true;
        }
        term2Num = term1Num;
        sequencePtr->term1Num = term1Num;
    }
    sequencePtr->term2Num = term2Num;
    return z;

}

static uint32_t ui32RandomP3( void )
{

    return
        ui32P1[randomN_ui8( ui32NumP1 )] + ui32P1[randomN_ui8( ui32NumP1 )]
            + ui32P1[randomN_ui8( ui32NumP1 )];

}

enum { ui32NumPInfWeightMasks = 29 };
static const uint32_t ui32PInfWeightMasks[ui32NumPInfWeightMasks] = {
    0xFFFFFFFF,
    0x7FFFFFFF,
    0x3FFFFFFF,
    0x1FFFFFFF,
    0x0FFFFFFF,
    0x07FFFFFF,
    0x03FFFFFF,
    0x01FFFFFF,
    0x00FFFFFF,
    0x007FFFFF,
    0x003FFFFF,
    0x001FFFFF,
    0x000FFFFF,
    0x0007FFFF,
    0x0003FFFF,
    0x0001FFFF,
    0x0000FFFF,
    0x00007FFF,
    0x00003FFF,
    0x00001FFF,
    0x00000FFF,
    0x000007FF,
    0x000003FF,
    0x000001FF,
    0x000000FF,
    0x0000007F,
    0x0000003F,
    0x0000001F,
    0x0000000F
};

static uint32_t ui32RandomPInf( void )
{
    int weightMaskNum;

    weightMaskNum = randomN_ui8( ui32NumPInfWeightMasks );
    return random_ui32() & ui32PInfWeightMasks[weightMaskNum];

}

static struct sequence sequenceA;
static int subcase;

uint32_t genCases_ui32_a;

void genCases_ui32_a_init( void )
{

    sequenceA.term1Num = 0;
    sequenceA.term2Num = 0;
    sequenceA.done = false;
    subcase = 0;
    genCases_total = (genCases_level == 1) ? 3 * ui32NumP1 : 2 * ui32NumP2;
    genCases_done = false;

}

void genCases_ui32_a_next( void )
{

    if ( genCases_level == 1 ) {
        switch ( subcase ) {
         case 0:
            genCases_ui32_a = ui32RandomP3();
            break;
         case 1:
            genCases_ui32_a = ui32RandomPInf();
            break;
         case 2:
            genCases_ui32_a = ui32NextP1( &sequenceA );
            genCases_done = sequenceA.done;
            subcase = -1;
            break;
        }
    } else {
        switch ( subcase ) {
         case 0:
            genCases_ui32_a = ui32RandomP3();
            break;
         case 2:
            genCases_ui32_a = ui32RandomPInf();
            break;
         case 3:
            subcase = -1;
         case 1:
            genCases_ui32_a = ui32NextP2( &sequenceA );
            genCases_done = sequenceA.done;
            break;
        }
    }
    ++subcase;

}