//
// Copyright (c) 2017 The Khronos Group Inc.
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "Utility.h"

#include <string.h>
#include "FunctionList.h"

int TestFunc_Float2_Float(const Func *f, MTdata, bool relaxedMode);
int TestFunc_Double2_Double(const Func *f, MTdata, bool relaxedMode);

extern const vtbl _unary_two_results = { "unary_two_results",
                                         TestFunc_Float2_Float,
                                         TestFunc_Double2_Double };

static int BuildKernel(const char *name, int vectorSize, cl_kernel *k,
                       cl_program *p, bool relaxedMode);
static int BuildKernelDouble(const char *name, int vectorSize, cl_kernel *k,
                             cl_program *p, bool relaxedMode);
static int BuildKernel(const char *name, int vectorSize, cl_kernel *k,
                       cl_program *p, bool relaxedMode)
{
    const char *c[] = { "__kernel void math_kernel", sizeNames[vectorSize], "( __global float", sizeNames[vectorSize], "* out, __global float", sizeNames[vectorSize], "* out2, __global float", sizeNames[vectorSize], "* in)\n"
                            "{\n"
                            "   int i = get_global_id(0);\n"
                            "   out[i] = ", name, "( in[i], out2 + i );\n"
                            "}\n"
                        };

    const char *c3[] = {    "__kernel void math_kernel", sizeNames[vectorSize], "( __global float* out, __global float* out2, __global float* in)\n"
                            "{\n"
                            "   size_t i = get_global_id(0);\n"
                            "   if( i + 1 < get_global_size(0) )\n"
                            "   {\n"
                            "       float3 f0 = vload3( 0, in + 3 * i );\n"
                            "       float3 iout = NAN;\n"
                            "       f0 = ", name, "( f0, &iout );\n"
                            "       vstore3( f0, 0, out + 3*i );\n"
                            "       vstore3( iout, 0, out2 + 3*i );\n"
                            "   }\n"
                            "   else\n"
                            "   {\n"
                            "       size_t parity = i & 1;   // Figure out how many elements are left over after BUFFER_SIZE % (3*sizeof(float)). Assume power of two buffer size \n"
                            "       float3 iout = NAN;\n"
                            "       float3 f0;\n"
                            "       switch( parity )\n"
                            "       {\n"
                            "           case 1:\n"
                            "               f0 = (float3)( in[3*i], NAN, NAN ); \n"
                            "               break;\n"
                            "           case 0:\n"
                            "               f0 = (float3)( in[3*i], in[3*i+1], NAN ); \n"
                            "               break;\n"
                            "       }\n"
                            "       f0 = ", name, "( f0, &iout );\n"
                            "       switch( parity )\n"
                            "       {\n"
                            "           case 0:\n"
                            "               out[3*i+1] = f0.y; \n"
                            "               out2[3*i+1] = iout.y; \n"
                            "               // fall through\n"
                            "           case 1:\n"
                            "               out[3*i] = f0.x; \n"
                            "               out2[3*i] = iout.x; \n"
                            "               break;\n"
                            "       }\n"
                            "   }\n"
                            "}\n"
                        };
    const char **kern = c;
    size_t kernSize = sizeof(c)/sizeof(c[0]);

    if( sizeValues[vectorSize] == 3 )
    {
        kern = c3;
        kernSize = sizeof(c3)/sizeof(c3[0]);
    }

    char testName[32];
    snprintf( testName, sizeof( testName ) -1, "math_kernel%s", sizeNames[vectorSize] );

    return MakeKernel(kern, (cl_uint)kernSize, testName, k, p, relaxedMode);
}

static int BuildKernelDouble(const char *name, int vectorSize, cl_kernel *k,
                             cl_program *p, bool relaxedMode)
{
    const char *c[] = { "#pragma OPENCL EXTENSION cl_khr_fp64 : enable\n",
                        "__kernel void math_kernel", sizeNames[vectorSize], "( __global double", sizeNames[vectorSize], "* out, __global double", sizeNames[vectorSize], "* out2, __global double", sizeNames[vectorSize], "* in)\n"
                            "{\n"
                            "   int i = get_global_id(0);\n"
                            "   out[i] = ", name, "( in[i], out2 + i );\n"
                            "}\n"
                        };

    const char *c3[] = {    "#pragma OPENCL EXTENSION cl_khr_fp64 : enable\n",
                            "__kernel void math_kernel", sizeNames[vectorSize], "( __global double* out, __global double* out2, __global double* in)\n"
                            "{\n"
                            "   size_t i = get_global_id(0);\n"
                            "   if( i + 1 < get_global_size(0) )\n"
                            "   {\n"
                            "       double3 f0 = vload3( 0, in + 3 * i );\n"
                            "       double3 iout = NAN;\n"
                            "       f0 = ", name, "( f0, &iout );\n"
                            "       vstore3( f0, 0, out + 3*i );\n"
                            "       vstore3( iout, 0, out2 + 3*i );\n"
                            "   }\n"
                            "   else\n"
                            "   {\n"
                            "       size_t parity = i & 1;   // Figure out how many elements are left over after BUFFER_SIZE % (3*sizeof(float)). Assume power of two buffer size \n"
                            "       double3 iout = NAN;\n"
                            "       double3 f0;\n"
                            "       switch( parity )\n"
                            "       {\n"
                            "           case 1:\n"
                            "               f0 = (double3)( in[3*i], NAN, NAN ); \n"
                            "               break;\n"
                            "           case 0:\n"
                            "               f0 = (double3)( in[3*i], in[3*i+1], NAN ); \n"
                            "               break;\n"
                            "       }\n"
                            "       f0 = ", name, "( f0, &iout );\n"
                            "       switch( parity )\n"
                            "       {\n"
                            "           case 0:\n"
                            "               out[3*i+1] = f0.y; \n"
                            "               out2[3*i+1] = iout.y; \n"
                            "               // fall through\n"
                            "           case 1:\n"
                            "               out[3*i] = f0.x; \n"
                            "               out2[3*i] = iout.x; \n"
                            "               break;\n"
                            "       }\n"
                            "   }\n"
                            "}\n"
                        };
    const char **kern = c;
    size_t kernSize = sizeof(c)/sizeof(c[0]);

    if( sizeValues[vectorSize] == 3 )
    {
        kern = c3;
        kernSize = sizeof(c3)/sizeof(c3[0]);
    }

    char testName[32];
    snprintf( testName, sizeof( testName ) -1, "math_kernel%s", sizeNames[vectorSize] );

    return MakeKernel(kern, (cl_uint)kernSize, testName, k, p, relaxedMode);
}

typedef struct BuildKernelInfo
{
    cl_uint     offset;            // the first vector size to build
    cl_kernel   *kernels;
    cl_program  *programs;
    const char  *nameInCode;
    bool relaxedMode; // Whether to build with -cl-fast-relaxed-math.
}BuildKernelInfo;

static cl_int BuildKernel_FloatFn( cl_uint job_id, cl_uint thread_id UNUSED, void *p );
static cl_int BuildKernel_FloatFn( cl_uint job_id, cl_uint thread_id UNUSED, void *p )
{
    BuildKernelInfo *info = (BuildKernelInfo*) p;
    cl_uint i = info->offset + job_id;
    return BuildKernel(info->nameInCode, i, info->kernels + i,
                       info->programs + i, info->relaxedMode);
}

static cl_int BuildKernel_DoubleFn( cl_uint job_id, cl_uint thread_id UNUSED, void *p );
static cl_int BuildKernel_DoubleFn( cl_uint job_id, cl_uint thread_id UNUSED, void *p )
{
    BuildKernelInfo *info = (BuildKernelInfo*) p;
    cl_uint i = info->offset + job_id;
    return BuildKernelDouble(info->nameInCode, i, info->kernels + i,
                             info->programs + i, info->relaxedMode);
}

int TestFunc_Float2_Float(const Func *f, MTdata d, bool relaxedMode)
{
    uint64_t i;
    uint32_t j, k;
    uint32_t l;
    int error;
    char const * testing_mode;
    cl_program programs[ VECTOR_SIZE_COUNT ];
    cl_kernel kernels[ VECTOR_SIZE_COUNT ];
    float maxError0 = 0.0f;
    float maxError1 = 0.0f;
    int ftz = f->ftz || gForceFTZ || 0 == (CL_FP_DENORM & gFloatCapabilities);
    float maxErrorVal0 = 0.0f;
    float maxErrorVal1 = 0.0f;
    size_t bufferSize = (gWimpyMode)? gWimpyBufferSize: BUFFER_SIZE;
    uint64_t step = getTestStep(sizeof(float), bufferSize);
    int scale = (int)((1ULL<<32) / (16 * bufferSize / sizeof( float )) + 1);
    cl_uchar overflow[BUFFER_SIZE / sizeof( float )];
    int isFract = 0 == strcmp( "fract", f->nameInCode );
    int skipNanInf = isFract  && ! gInfNanSupport;
    float float_ulps = getAllowedUlpError(f, relaxedMode);

    logFunctionInfo(f->name, sizeof(cl_float), relaxedMode);

    // Init the kernels
    BuildKernelInfo build_info = { gMinVectorSizeIndex, kernels, programs,
                                   f->nameInCode, relaxedMode };
    if( (error = ThreadPool_Do( BuildKernel_FloatFn, gMaxVectorSizeIndex - gMinVectorSizeIndex, &build_info ) ))
        return error;
/*
    for( i = gMinVectorSizeIndex; i < gMaxVectorSizeIndex; i++ )
        if( (error =  BuildKernel( f->nameInCode, (int) i, kernels + i, programs + i) ) )
            return error;
*/

    for( i = 0; i < (1ULL<<32); i += step )
    {
        //Init input array
        uint32_t *p = (uint32_t *)gIn;
        if( gWimpyMode )
        {
          for( j = 0; j < bufferSize / sizeof( float ); j++ )
          {
            p[j] = (uint32_t) i + j * scale;
            if (relaxedMode && strcmp(f->name, "sincos") == 0)
            {
              float pj = *(float *)&p[j];
              if (fabs(pj) > M_PI) ((float *)p)[j] = NAN;
            }
          }
        }
        else
        {
          for( j = 0; j < bufferSize / sizeof( float ); j++ )
          {
            p[j] = (uint32_t) i + j;
            if (relaxedMode && strcmp(f->name, "sincos") == 0)
            {
              float pj = *(float *)&p[j];
              if (fabs(pj) > M_PI) ((float *)p)[j] = NAN;
            }
          }
        }
        if( (error = clEnqueueWriteBuffer(gQueue, gInBuffer, CL_FALSE, 0, bufferSize, gIn, 0, NULL, NULL) ))
        {
            vlog_error( "\n*** Error %d in clEnqueueWriteBuffer ***\n", error );
            return error;
        }

        // write garbage into output arrays
        for( j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++ )
        {
            uint32_t pattern = 0xffffdead;
            memset_pattern4(gOut[j], &pattern, bufferSize);
            if( (error = clEnqueueWriteBuffer(gQueue, gOutBuffer[j], CL_FALSE, 0, bufferSize, gOut[j], 0, NULL, NULL) ))
            {
                vlog_error( "\n*** Error %d in clEnqueueWriteBuffer2(%d) ***\n", error, j );
                goto exit;
            }

            memset_pattern4(gOut2[j], &pattern, bufferSize);
            if( (error = clEnqueueWriteBuffer(gQueue, gOutBuffer2[j], CL_FALSE, 0, bufferSize, gOut2[j], 0, NULL, NULL)))
            {
                vlog_error( "\n*** Error %d in clEnqueueWriteBuffer2b(%d) ***\n", error, j );
                goto exit;
            }
        }

        // Run the kernels
        for( j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++ )
        {
            size_t vectorSize = sizeValues[j] * sizeof(cl_float);
            size_t localCount = (bufferSize + vectorSize - 1) / vectorSize;
            if( ( error = clSetKernelArg(kernels[j], 0, sizeof( gOutBuffer[j] ), &gOutBuffer[j] ) )) { LogBuildError(programs[j]); goto exit; }
            if( ( error = clSetKernelArg(kernels[j], 1, sizeof( gOutBuffer2[j] ), &gOutBuffer2[j] ) )) { LogBuildError(programs[j]); goto exit; }
            if( ( error = clSetKernelArg(kernels[j], 2, sizeof( gInBuffer ), &gInBuffer ) )) { LogBuildError(programs[j]); goto exit; }

            if( (error = clEnqueueNDRangeKernel(gQueue, kernels[j], 1, NULL, &localCount, NULL, 0, NULL, NULL)) )
            {
                vlog_error( "FAILED -- could not execute kernel\n" );
                goto exit;
            }
        }

        // Get that moving
        if( (error = clFlush(gQueue) ))
            vlog( "clFlush failed\n" );

        FPU_mode_type oldMode;
        RoundingMode oldRoundMode = kRoundToNearestEven;
        if( isFract )
        {
            //Calculate the correctly rounded reference result
            memset( &oldMode, 0, sizeof( oldMode ) );
            if( ftz )
                ForceFTZ( &oldMode );

            // Set the rounding mode to match the device
            if (gIsInRTZMode)
                oldRoundMode = set_round(kRoundTowardZero, kfloat);
        }

        //Calculate the correctly rounded reference result
        float *r = (float *)gOut_Ref;
        float *r2 = (float *)gOut_Ref2;
        float *s = (float *)gIn;

        if( skipNanInf )
        {
            for( j = 0; j < bufferSize / sizeof( float ); j++ )
            {
                double dd;
                feclearexcept(FE_OVERFLOW);

                if (relaxedMode)
                    r[j] = (float) f->rfunc.f_fpf( s[j], &dd );
                else
                    r[j] = (float) f->func.f_fpf( s[j], &dd );

                r2[j] = (float) dd;
                overflow[j] = FE_OVERFLOW == (FE_OVERFLOW & fetestexcept(FE_OVERFLOW));
            }
        }
        else
        {
            for( j = 0; j < bufferSize / sizeof( float ); j++ )
            {
                double dd;
                if (relaxedMode)
                    r[j] = (float)f->rfunc.f_fpf(s[j], &dd);
                else
                  r[j] = (float) f->func.f_fpf( s[j], &dd );

                r2[j] = (float) dd;
            }
        }

        if( isFract && ftz )
            RestoreFPState( &oldMode );

        // Read the data back
        for( j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++ )
        {
            if( (error = clEnqueueReadBuffer(gQueue, gOutBuffer[j], CL_TRUE, 0, bufferSize, gOut[j], 0, NULL, NULL)) )
            {
                vlog_error( "ReadArray failed %d\n", error );
                goto exit;
            }
            if( (error = clEnqueueReadBuffer(gQueue, gOutBuffer2[j], CL_TRUE, 0, bufferSize, gOut2[j], 0, NULL, NULL)) )
            {
                vlog_error( "ReadArray2 failed %d\n", error );
                goto exit;
            }
        }

        if( gSkipCorrectnessTesting )
        {
            if (isFract && gIsInRTZMode)
                (void)set_round(oldRoundMode, kfloat);
            break;
        }

        //Verify data
        uint32_t *t = (uint32_t *)gOut_Ref;
        uint32_t *t2 = (uint32_t *)gOut_Ref2;
        for( j = 0; j < bufferSize / sizeof( float ); j++ )
        {
            for( k = gMinVectorSizeIndex; k < gMaxVectorSizeIndex; k++ )
            {
                uint32_t *q = (uint32_t *)gOut[k];
                uint32_t *q2 = (uint32_t *)gOut2[k];

                // If we aren't getting the correctly rounded result
                if( t[j] != q[j] || t2[j] != q2[j]  )
                {
                    double correct, correct2;
                    float err, err2;
                    float test = ((float*) q)[j];
                    float test2 = ((float*) q2)[j];

                    if (relaxedMode)
                        correct = f->rfunc.f_fpf(s[j], &correct2);
                    else
                      correct = f->func.f_fpf( s[j], &correct2 );

                    // Per section 10 paragraph 6, accept any result if an input or output is a infinity or NaN or overflow
                    if (relaxedMode || skipNanInf)
                    {
                        if (skipNanInf && overflow[j])
                            continue;

                        // Note: no double rounding here.  Reference functions calculate in single precision.
                        if( IsFloatInfinity(correct) || IsFloatNaN(correct)     ||
                            IsFloatInfinity(correct2)|| IsFloatNaN(correct2)    ||
                            IsFloatInfinity(s[j])    || IsFloatNaN(s[j])        )
                            continue;
                    }

                    typedef int (*CheckForSubnormal) (double,float); // If we are in fast relaxed math, we have a different calculation for the subnormal threshold.
                    CheckForSubnormal isFloatResultSubnormalPtr;
                    if (relaxedMode)
                    {
                      err = Abs_Error( test, correct);
                      err2 = Abs_Error( test2, correct2);
                      isFloatResultSubnormalPtr = &IsFloatResultSubnormalAbsError;
                    }
                    else
                    {
                        err = Ulp_Error( test, correct );
                        err2 = Ulp_Error( test2, correct2 );
                        isFloatResultSubnormalPtr = &IsFloatResultSubnormal;
                    }
                    int fail = ! (fabsf(err) <= float_ulps && fabsf(err2) <= float_ulps);

                    if( ftz )
                    {
                        // retry per section 6.5.3.2
                        if( (*isFloatResultSubnormalPtr)(correct, float_ulps) )
                        {
                            if( (*isFloatResultSubnormalPtr) (correct2, float_ulps ))
                            {
                                fail = fail && ! ( test == 0.0f && test2 == 0.0f );
                                if( ! fail )
                                {
                                    err = 0.0f;
                                    err2 = 0.0f;
                                }
                            }
                            else
                            {
                                fail = fail && ! ( test == 0.0f && fabsf(err2) <= float_ulps);
                                if( ! fail )
                                    err = 0.0f;
                            }
                        }
                        else if( (*isFloatResultSubnormalPtr)(correct2, float_ulps ) )
                        {
                            fail = fail && ! ( test2 == 0.0f && fabsf(err) <= float_ulps);
                            if( ! fail )
                                err2 = 0.0f;
                        }


                        // retry per section 6.5.3.3
                        if( IsFloatSubnormal( s[j] ) )
                        {
                            double correctp, correctn;
                            double correct2p, correct2n;
                            float errp, err2p, errn, err2n;

                            if( skipNanInf )
                                feclearexcept(FE_OVERFLOW);
                            if (relaxedMode)
                            {
                              correctp = f->rfunc.f_fpf( 0.0, &correct2p );
                              correctn = f->rfunc.f_fpf( -0.0, &correct2n );
                            }
                            else
                            {
                              correctp = f->func.f_fpf( 0.0, &correct2p );
                              correctn = f->func.f_fpf( -0.0, &correct2n );
                            }

                            // Per section 10 paragraph 6, accept any result if an input or output is a infinity or NaN or overflow
                            if( skipNanInf )
                            {
                                if( fetestexcept(FE_OVERFLOW) )
                                    continue;

                                // Note: no double rounding here.  Reference functions calculate in single precision.
                                if( IsFloatInfinity(correctp) || IsFloatNaN(correctp)   ||
                                    IsFloatInfinity(correctn) || IsFloatNaN(correctn)   ||
                                    IsFloatInfinity(correct2p) || IsFloatNaN(correct2p) ||
                                    IsFloatInfinity(correct2n) || IsFloatNaN(correct2n) )
                                    continue;
                            }

                            if (relaxedMode)
                            {
                              errp = Abs_Error( test, correctp  );
                              err2p = Abs_Error( test, correct2p  );
                              errn = Abs_Error( test, correctn  );
                              err2n = Abs_Error( test, correct2n  );
                            }
                            else
                            {
                              errp = Ulp_Error( test, correctp  );
                              err2p = Ulp_Error( test, correct2p  );
                              errn = Ulp_Error( test, correctn  );
                              err2n = Ulp_Error( test, correct2n  );
                            }

                            fail =  fail && ((!(fabsf(errp) <= float_ulps)) && (!(fabsf(err2p) <= float_ulps))    &&
                                            ((!(fabsf(errn) <= float_ulps)) && (!(fabsf(err2n) <= float_ulps))) );
                            if( fabsf( errp ) < fabsf(err ) )
                                err = errp;
                            if( fabsf( errn ) < fabsf(err ) )
                                err = errn;
                            if( fabsf( err2p ) < fabsf(err2 ) )
                                err2 = err2p;
                            if( fabsf( err2n ) < fabsf(err2 ) )
                                err2 = err2n;

                            // retry per section 6.5.3.4
                            if(  (*isFloatResultSubnormalPtr)( correctp, float_ulps ) || (*isFloatResultSubnormalPtr)( correctn, float_ulps )  )
                            {
                              if( (*isFloatResultSubnormalPtr)( correct2p, float_ulps ) || (*isFloatResultSubnormalPtr)( correct2n, float_ulps ) )
                              {
                                fail = fail && !( test == 0.0f && test2 == 0.0f);
                                if( ! fail )
                                  err = err2 = 0.0f;
                              }
                              else
                              {
                                fail = fail && ! (test == 0.0f && fabsf(err2) <= float_ulps);
                                if( ! fail )
                                  err = 0.0f;
                              }
                            }
                            else if( (*isFloatResultSubnormalPtr)( correct2p, float_ulps ) || (*isFloatResultSubnormalPtr)( correct2n, float_ulps ) )
                            {
                                fail = fail && ! (test2 == 0.0f && (fabsf(err) <= float_ulps));
                                if( ! fail )
                                    err2 = 0.0f;
                            }
                        }
                    }
                    if( fabsf(err ) > maxError0 )
                    {
                        maxError0 = fabsf(err);
                        maxErrorVal0 = s[j];
                    }
                    if( fabsf(err2 ) > maxError1 )
                    {
                        maxError1 = fabsf(err2);
                        maxErrorVal1 = s[j];
                    }
                    if( fail )
                    {
                        vlog_error( "\nERROR: %s%s: {%f, %f} ulp error at %a: *{%a, %a} vs. {%a, %a}\n", f->name, sizeNames[k], err, err2, ((float*) gIn)[j], ((float*) gOut_Ref)[j], ((float*) gOut_Ref2)[j], test, test2 );
                      error = -1;
                      goto exit;
                    }
                }
            }
        }

        if (isFract && gIsInRTZMode)
            (void)set_round(oldRoundMode, kfloat);

        if( 0 == (i & 0x0fffffff) )
        {
           if (gVerboseBruteForce)
           {
               vlog("base:%14u step:%10zu  bufferSize:%10zd \n", i, step, bufferSize);
           } else
           {
              vlog(".");
           }
           fflush(stdout);
        }
    }

    if( ! gSkipCorrectnessTesting )
    {
        if( gWimpyMode )
            vlog( "Wimp pass" );
        else
            vlog( "passed" );
    }

    if( gMeasureTimes )
    {
        //Init input array
        uint32_t *p = (uint32_t *)gIn;
        for( j = 0; j < bufferSize / sizeof( float ); j++ )
            p[j] = genrand_int32(d);
        if( (error = clEnqueueWriteBuffer(gQueue, gInBuffer, CL_FALSE, 0, bufferSize, gIn, 0, NULL, NULL) ))
        {
            vlog_error( "\n*** Error %d in clEnqueueWriteBuffer ***\n", error );
            return error;
        }


        // Run the kernels
        for( j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++ )
        {
            size_t vectorSize = sizeValues[j] * sizeof(cl_float);
            size_t localCount = (bufferSize + vectorSize - 1) / vectorSize;
            if( ( error = clSetKernelArg(kernels[j], 0, sizeof( gOutBuffer[j] ), &gOutBuffer[j] ) )) { LogBuildError(programs[j]); goto exit; }
            if( ( error = clSetKernelArg(kernels[j], 1, sizeof( gOutBuffer2[j] ), &gOutBuffer2[j]) )) { LogBuildError(programs[j]); goto exit; }
            if( ( error = clSetKernelArg( kernels[j], 2, sizeof( gInBuffer ), &gInBuffer ) )) { LogBuildError(programs[j]); goto exit; }

            double sum = 0.0;
            double bestTime = INFINITY;
            for( k = 0; k < PERF_LOOP_COUNT; k++ )
            {

                uint64_t startTime = GetTime();
                if( (error = clEnqueueNDRangeKernel(gQueue, kernels[j], 1, NULL, &localCount, NULL, 0, NULL, NULL)) )
                {
                    vlog_error( "FAILED -- could not execute kernel\n" );
                    goto exit;
                }

                // Make sure OpenCL is done
                if( (error = clFinish(gQueue) ) )
                {
                    vlog_error( "Error %d at clFinish\n", error );
                    goto exit;
                }

                uint64_t endTime = GetTime();
                double time = SubtractTime( endTime, startTime );
                sum += time;
                if( time < bestTime )
                    bestTime = time;
            }

            if( gReportAverageTimes )
                bestTime = sum / PERF_LOOP_COUNT;
            double clocksPerOp = bestTime * (double) gDeviceFrequency * gComputeDevices * gSimdSize * 1e6 / (bufferSize / sizeof( float ) );
            vlog_perf( clocksPerOp, LOWER_IS_BETTER, "clocks / element", "%sf%s", f->name, sizeNames[j] );
        }
    }

    if( ! gSkipCorrectnessTesting )
        vlog( "\t{%8.2f, %8.2f} @ {%a, %a}", maxError0, maxError1, maxErrorVal0, maxErrorVal1 );
    vlog( "\n" );

exit:
    // Release
    for( k = gMinVectorSizeIndex; k < gMaxVectorSizeIndex; k++ )
    {
        clReleaseKernel(kernels[k]);
        clReleaseProgram(programs[k]);
    }

    return error;
}

int TestFunc_Double2_Double(const Func *f, MTdata d, bool relaxedMode)
{
    uint64_t i;
    uint32_t j, k;
    int error;
    cl_program programs[ VECTOR_SIZE_COUNT ];
    cl_kernel kernels[ VECTOR_SIZE_COUNT ];
    float maxError0 = 0.0f;
    float maxError1 = 0.0f;
    int ftz = f->ftz || gForceFTZ;
    double maxErrorVal0 = 0.0f;
    double maxErrorVal1 = 0.0f;
    size_t bufferSize = (gWimpyMode)? gWimpyBufferSize: BUFFER_SIZE;
    uint64_t step = getTestStep(sizeof(cl_double), bufferSize);
    int scale = (int)((1ULL<<32) / (16 * bufferSize / sizeof( cl_double )) + 1);

    logFunctionInfo(f->name, sizeof(cl_double), relaxedMode);

    Force64BitFPUPrecision();

    // Init the kernels
    BuildKernelInfo build_info = { gMinVectorSizeIndex, kernels, programs,
                                   f->nameInCode, relaxedMode };
    if( (error = ThreadPool_Do( BuildKernel_DoubleFn,
                                gMaxVectorSizeIndex - gMinVectorSizeIndex,
                                &build_info ) ))
    {
        return error;
    }
/*
    for( i = gMinVectorSizeIndex; i < gMaxVectorSizeIndex; i++ )
        if( (error =  BuildKernelDouble( f->nameInCode, (int) i, kernels + i, programs + i) ) )
            return error;
*/

    for( i = 0; i < (1ULL<<32); i += step )
    {
        //Init input array
        double *p = (double *)gIn;
        if( gWimpyMode )
        {
            for( j = 0; j < bufferSize / sizeof( cl_double ); j++ )
                p[j] = DoubleFromUInt32((uint32_t) i + j * scale);
        }
        else
        {
            for( j = 0; j < bufferSize / sizeof( cl_double ); j++ )
                p[j] = DoubleFromUInt32((uint32_t) i + j);
        }
        if( (error = clEnqueueWriteBuffer(gQueue, gInBuffer, CL_FALSE, 0, bufferSize, gIn, 0, NULL, NULL) ))
        {
            vlog_error( "\n*** Error %d in clEnqueueWriteBuffer ***\n", error );
            return error;
        }

        // write garbage into output arrays
        for( j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++ )
        {
            uint32_t pattern = 0xffffdead;
            memset_pattern4(gOut[j], &pattern, bufferSize);
            if( (error = clEnqueueWriteBuffer(gQueue, gOutBuffer[j], CL_FALSE, 0, bufferSize, gOut[j], 0, NULL, NULL) ))
            {
                vlog_error( "\n*** Error %d in clEnqueueWriteBuffer2(%d) ***\n", error, j );
                goto exit;
            }

            memset_pattern4(gOut2[j], &pattern, bufferSize);
            if( (error = clEnqueueWriteBuffer(gQueue, gOutBuffer2[j], CL_FALSE, 0, bufferSize, gOut2[j], 0, NULL, NULL)))
            {
                vlog_error( "\n*** Error %d in clEnqueueWriteBuffer2b(%d) ***\n", error, j );
                goto exit;
            }
        }

        // Run the kernels
        for( j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++ )
        {
            size_t vectorSize = sizeValues[j] * sizeof(cl_double);
            size_t localCount = (bufferSize + vectorSize - 1) / vectorSize;
            if( ( error = clSetKernelArg(kernels[j], 0, sizeof( gOutBuffer[j] ), &gOutBuffer[j] ) )) { LogBuildError(programs[j]); goto exit; }
            if( ( error = clSetKernelArg(kernels[j], 1, sizeof( gOutBuffer2[j] ), &gOutBuffer2[j] ) )) { LogBuildError(programs[j]); goto exit; }
            if( ( error = clSetKernelArg(kernels[j], 2, sizeof( gInBuffer ), &gInBuffer ) )) { LogBuildError(programs[j]); goto exit; }

            if( (error = clEnqueueNDRangeKernel(gQueue, kernels[j], 1, NULL, &localCount, NULL, 0, NULL, NULL)) )
            {
                vlog_error( "FAILED -- could not execute kernel\n" );
                goto exit;
            }
        }

        // Get that moving
        if( (error = clFlush(gQueue) ))
            vlog( "clFlush failed\n" );

        //Calculate the correctly rounded reference result
        double *r = (double *)gOut_Ref;
        double *r2 = (double *)gOut_Ref2;
        double *s = (double *)gIn;
        for( j = 0; j < bufferSize / sizeof( cl_double ); j++ )
        {
            long double dd;
            r[j] = (double) f->dfunc.f_fpf( s[j], &dd );
            r2[j] = (double) dd;
        }

        // Read the data back
        for( j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++ )
        {
            if( (error = clEnqueueReadBuffer(gQueue, gOutBuffer[j], CL_TRUE, 0, bufferSize, gOut[j], 0, NULL, NULL)) )
            {
                vlog_error( "ReadArray failed %d\n", error );
                goto exit;
            }
            if( (error = clEnqueueReadBuffer(gQueue, gOutBuffer2[j], CL_TRUE, 0, bufferSize, gOut2[j], 0, NULL, NULL)) )
            {
                vlog_error( "ReadArray2 failed %d\n", error );
                goto exit;
            }
        }

        if( gSkipCorrectnessTesting )
            break;

        //Verify data
        uint64_t *t = (uint64_t *)gOut_Ref;
        uint64_t *t2 = (uint64_t *)gOut_Ref2;
        for( j = 0; j < bufferSize / sizeof( double ); j++ )
        {
            for( k = gMinVectorSizeIndex; k < gMaxVectorSizeIndex; k++ )
            {
                uint64_t *q = (uint64_t *)(gOut[k]);
                uint64_t *q2 = (uint64_t *)(gOut2[k]);

                // If we aren't getting the correctly rounded result
                if( t[j] != q[j] || t2[j] != q2[j]  )
                {
                    double test = ((double*) q)[j];
                    double test2 = ((double*) q2)[j];
                    long double correct2;
                    long double correct = f->dfunc.f_fpf( s[j], &correct2 );
                    float err = Bruteforce_Ulp_Error_Double( test, correct );
                    float err2 = Bruteforce_Ulp_Error_Double( test2, correct2 );
                    int fail = ! (fabsf(err) <= f->double_ulps && fabsf(err2) <= f->double_ulps);
                    if( ftz )
                    {
                        // retry per section 6.5.3.2
                        if( IsDoubleResultSubnormal(correct, f->double_ulps ) )
                        {
                            if( IsDoubleResultSubnormal( correct2, f->double_ulps ) )
                            {
                                fail = fail && ! ( test == 0.0f && test2 == 0.0f );
                                if( ! fail )
                                {
                                    err = 0.0f;
                                    err2 = 0.0f;
                                }
                            }
                            else
                            {
                                fail = fail && ! ( test == 0.0f && fabsf(err2) <= f->double_ulps);
                                if( ! fail )
                                    err = 0.0f;
                            }
                        }
                        else if( IsDoubleResultSubnormal( correct2, f->double_ulps ) )
                        {
                            fail = fail && ! ( test2 == 0.0f && fabsf(err) <= f->double_ulps);
                            if( ! fail )
                                err2 = 0.0f;
                        }

                        // retry per section 6.5.3.3
                        if( IsDoubleSubnormal( s[j] ) )
                        {
                            long double correct2p, correct2n;
                            long double correctp = f->dfunc.f_fpf( 0.0, &correct2p );
                            long double correctn = f->dfunc.f_fpf( -0.0, &correct2n );
                            float errp = Bruteforce_Ulp_Error_Double( test, correctp  );
                            float err2p = Bruteforce_Ulp_Error_Double( test, correct2p  );
                            float errn = Bruteforce_Ulp_Error_Double( test, correctn  );
                            float err2n = Bruteforce_Ulp_Error_Double( test, correct2n  );
                            fail =  fail && ((!(fabsf(errp) <= f->double_ulps)) && (!(fabsf(err2p) <= f->double_ulps))    &&
                                            ((!(fabsf(errn) <= f->double_ulps)) && (!(fabsf(err2n) <= f->double_ulps))) );
                            if( fabsf( errp ) < fabsf(err ) )
                                err = errp;
                            if( fabsf( errn ) < fabsf(err ) )
                                err = errn;
                            if( fabsf( err2p ) < fabsf(err2 ) )
                                err2 = err2p;
                            if( fabsf( err2n ) < fabsf(err2 ) )
                                err2 = err2n;

                            // retry per section 6.5.3.4
                            if( IsDoubleResultSubnormal( correctp, f->double_ulps ) || IsDoubleResultSubnormal( correctn, f->double_ulps ) )
                            {
                                if( IsDoubleResultSubnormal( correct2p, f->double_ulps ) || IsDoubleResultSubnormal( correct2n, f->double_ulps ) )
                                {
                                    fail = fail && !( test == 0.0f && test2 == 0.0f);
                                    if( ! fail )
                                        err = err2 = 0.0f;
                                }
                                else
                                {
                                    fail = fail && ! (test == 0.0f && fabsf(err2) <= f->double_ulps);
                                    if( ! fail )
                                        err = 0.0f;
                                }
                            }
                            else if( IsDoubleResultSubnormal( correct2p, f->double_ulps ) || IsDoubleResultSubnormal( correct2n, f->double_ulps ) )
                            {
                                fail = fail && ! (test2 == 0.0f && (fabsf(err) <= f->double_ulps));
                                if( ! fail )
                                    err2 = 0.0f;
                            }
                        }
                    }
                    if( fabsf(err ) > maxError0 )
                    {
                        maxError0 = fabsf(err);
                        maxErrorVal0 = s[j];
                    }
                    if( fabsf(err2 ) > maxError1 )
                    {
                        maxError1 = fabsf(err2);
                        maxErrorVal1 = s[j];
                    }
                    if( fail )
                    {
                        vlog_error( "\nERROR: %sD%s: {%f, %f} ulp error at %.13la: *{%.13la, %.13la} vs. {%.13la, %.13la}\n", f->name, sizeNames[k], err, err2, ((double*) gIn)[j], ((double*) gOut_Ref)[j], ((double*) gOut_Ref2)[j], test, test2 );
                      error = -1;
                      goto exit;
                    }
                }
            }
        }

        if( 0 == (i & 0x0fffffff) )
        {
           if (gVerboseBruteForce)
           {
               vlog("base:%14u step:%10zu  bufferSize:%10zd \n", i, step, bufferSize);
           } else
           {
              vlog("." );
           }
           fflush(stdout);
        }
    }

    if( ! gSkipCorrectnessTesting )
    {
        if( gWimpyMode )
            vlog( "Wimp pass" );
        else
            vlog( "passed" );
    }

    if( gMeasureTimes )
    {
        //Init input array
        double *p = (double*) gIn;
        for( j = 0; j < bufferSize / sizeof( double ); j++ )
            p[j] = DoubleFromUInt32(genrand_int32(d) );
        if( (error = clEnqueueWriteBuffer(gQueue, gInBuffer, CL_FALSE, 0, bufferSize, gIn, 0, NULL, NULL) ))
        {
            vlog_error( "\n*** Error %d in clEnqueueWriteBuffer ***\n", error );
            return error;
        }


        // Run the kernels
        for( j = gMinVectorSizeIndex; j < gMaxVectorSizeIndex; j++ )
        {
            size_t vectorSize = sizeValues[j] * sizeof(cl_double);
            size_t localCount = (bufferSize + vectorSize - 1) / vectorSize;
            if( ( error = clSetKernelArg(kernels[j], 0, sizeof( gOutBuffer[j] ), &gOutBuffer[j] ) )) { LogBuildError(programs[j]); goto exit; }
            if( ( error = clSetKernelArg(kernels[j], 1, sizeof( gOutBuffer2[j] ), &gOutBuffer2[j]) )) { LogBuildError(programs[j]); goto exit; }
            if( ( error = clSetKernelArg( kernels[j], 2, sizeof( gInBuffer ), &gInBuffer ) )) { LogBuildError(programs[j]); goto exit; }

            double sum = 0.0;
            double bestTime = INFINITY;
            for( k = 0; k < PERF_LOOP_COUNT; k++ )
            {

                uint64_t startTime = GetTime();
                if( (error = clEnqueueNDRangeKernel(gQueue, kernels[j], 1, NULL, &localCount, NULL, 0, NULL, NULL)) )
                {
                    vlog_error( "FAILED -- could not execute kernel\n" );
                    goto exit;
                }

                // Make sure OpenCL is done
                if( (error = clFinish(gQueue) ) )
                {
                    vlog_error( "Error %d at clFinish\n", error );
                    goto exit;
                }

                uint64_t endTime = GetTime();
                double time = SubtractTime( endTime, startTime );
                sum += time;
                if( time < bestTime )
                    bestTime = time;
            }

            if( gReportAverageTimes )
                bestTime = sum / PERF_LOOP_COUNT;
            double clocksPerOp = bestTime * (double) gDeviceFrequency * gComputeDevices * gSimdSize * 1e6 / (bufferSize / sizeof( double ) );
            vlog_perf( clocksPerOp, LOWER_IS_BETTER, "clocks / element", "%sD%s", f->name, sizeNames[j] );
        }
        for( ; j < gMaxVectorSizeIndex; j++ )
            vlog( "\t     -- " );
    }

    if( ! gSkipCorrectnessTesting )
        vlog( "\t{%8.2f, %8.2f} @ {%a, %a}", maxError0, maxError1, maxErrorVal0, maxErrorVal1 );
    vlog( "\n" );

exit:
    // Release
    for( k = gMinVectorSizeIndex; k < gMaxVectorSizeIndex; k++ )
    {
        clReleaseKernel(kernels[k]);
        clReleaseProgram(programs[k]);
    }

    return error;
}