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

This C source file is part of TestFloat, Release 3, 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
(Regents).  All Rights Reserved.  Redistribution and use in source and binary
forms, with or without modification, are permitted provided that the following
conditions are met:

Redistributions of source code must retain the above copyright notice,
this list of conditions, and the following two paragraphs of disclaimer.
Redistributions in binary form must reproduce the above copyright notice,
this list of conditions, and the following two paragraphs of disclaimer in the
documentation and/or other materials provided with the distribution.  Neither
the name of the Regents nor the names of its contributors may be used to
endorse or promote products derived from this software without specific prior
written permission.

IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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HEREUNDER IS PROVIDED "AS IS".  REGENTS HAS NO OBLIGATION TO PROVIDE
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=============================================================================*/

#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 uint_fast32_t ui32NextP1( struct sequence *sequencePtr )
{
    int termNum;
    uint_fast32_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 uint_fast32_t ui32NextP2( struct sequence *sequencePtr )
{
    int term1Num, term2Num;
    uint_fast32_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 uint_fast32_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 uint_fast32_t ui32RandomPInf( void )
{
    int weightMaskNum;

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

}

static struct sequence sequenceA;
static int subcase;

uint_fast32_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;

}