/**************************************************************************
 *
 * Copyright 2009 VMware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/


/**
 * @file
 * Shared testing code.
 *
 * @author Jose Fonseca <jfonseca@vmware.com>
 */


#include "util/u_math.h"

#include "gallivm/lp_bld_const.h"
#include "gallivm/lp_bld_init.h"
#include "gallivm/lp_bld_debug.h"
#include "lp_test.h"


void
dump_type(FILE *fp,
          struct lp_type type)
{
   fprintf(fp, "%s%s%u%sx%u",
           type.sign ? (type.floating || type.fixed ? "" : "s") : "u",
           type.floating ? "f" : (type.fixed ? "h" : "i"),
           type.width,
           type.norm ? "n" : "",
           type.length);
}


double
read_elem(struct lp_type type, const void *src, unsigned index)
{
   double scale = lp_const_scale(type);
   double value;
   assert(index < type.length);
   if (type.floating) {
      switch (type.width) {
      case 32:
         value = *((const float *)src + index);
         break;
      case 64:
         value =  *((const double *)src + index);
         break;
      default:
         assert(0);
         return 0.0;
      }
   } else {
      if (type.sign) {
         switch (type.width) {
         case 8:
            value = *((const int8_t *)src + index);
            break;
         case 16:
            value = *((const int16_t *)src + index);
            break;
         case 32:
            value = *((const int32_t *)src + index);
            break;
         case 64:
            value = *((const int64_t *)src + index);
            break;
         default:
            assert(0);
            return 0.0;
         }
      } else {
         switch (type.width) {
         case 8:
            value = *((const uint8_t *)src + index);
            break;
         case 16:
            value = *((const uint16_t *)src + index);
            break;
         case 32:
            value = *((const uint32_t *)src + index);
            break;
         case 64:
            value = *((const uint64_t *)src + index);
            break;
         default:
            assert(0);
            return 0.0;
         }
      }
   }
   return value/scale;
}


void
write_elem(struct lp_type type, void *dst, unsigned index, double value)
{
   assert(index < type.length);
   if (!type.sign && value < 0.0)
      value = 0.0;
   if (type.norm && value < -1.0)
      value = -1.0;
   if (type.norm && value > 1.0)
      value = 1.0;
   if (type.floating) {
      switch (type.width) {
      case 32:
         *((float *)dst + index) = (float)(value);
         break;
      case 64:
          *((double *)dst + index) = value;
         break;
      default:
         assert(0);
      }
   } else {
      double scale = lp_const_scale(type);
      value = round(value*scale);
      if (type.sign) {
         long long lvalue = (long long)value;
         lvalue = MIN2(lvalue, ((long long)1 << (type.width - 1)) - 1);
         lvalue = MAX2(lvalue, -((long long)1 << (type.width - 1)));
         switch (type.width) {
         case 8:
            *((int8_t *)dst + index) = (int8_t)lvalue;
            break;
         case 16:
            *((int16_t *)dst + index) = (int16_t)lvalue;
            break;
         case 32:
            *((int32_t *)dst + index) = (int32_t)lvalue;
            break;
         case 64:
            *((int64_t *)dst + index) = (int64_t)lvalue;
            break;
         default:
            assert(0);
         }
      } else {
         unsigned long long lvalue = (long long)value;
         lvalue = MIN2(lvalue, ((unsigned long long)1 << type.width) - 1);
         switch (type.width) {
         case 8:
            *((uint8_t *)dst + index) = (uint8_t)lvalue;
            break;
         case 16:
            *((uint16_t *)dst + index) = (uint16_t)lvalue;
            break;
         case 32:
            *((uint32_t *)dst + index) = (uint32_t)lvalue;
            break;
         case 64:
            *((uint64_t *)dst + index) = (uint64_t)lvalue;
            break;
         default:
            assert(0);
         }
      }
   }
}


void
random_elem(struct lp_type type, void *dst, unsigned index)
{
   double value;
   assert(index < type.length);
   value = (double)rand()/(double)RAND_MAX;
   if (!type.norm) {
      if (type.floating) {
         value *= 2.0;
      } else {
         unsigned long long mask;
         if (type.fixed)
            mask = ((unsigned long long)1 << (type.width / 2)) - 1;
         else if (type.sign)
            mask = ((unsigned long long)1 << (type.width - 1)) - 1;
         else
            mask = ((unsigned long long)1 << type.width) - 1;
         value += (double)(mask & rand());
         if (!type.fixed && !type.sign && type.width == 32) {
            /*
             * rand only returns half the possible range
             * XXX 64bit values...
             */
            if (rand() & 1)
               value += (double)0x80000000;
         }
      }
   }
   if (type.sign)
      if (rand() & 1)
         value = -value;
   write_elem(type, dst, index, value);
}


void
read_vec(struct lp_type type, const void *src, double *dst)
{
   unsigned i;
   for (i = 0; i < type.length; ++i)
      dst[i] = read_elem(type, src, i);
}


void
write_vec(struct lp_type type, void *dst, const double *src)
{
   unsigned i;
   for (i = 0; i < type.length; ++i)
      write_elem(type, dst, i, src[i]);
}


float
random_float(void)
{
    return (float)((double)rand()/(double)RAND_MAX);
}


void
random_vec(struct lp_type type, void *dst)
{
   unsigned i;
   for (i = 0; i < type.length; ++i)
      random_elem(type, dst, i);
}


bool
compare_vec_with_eps(struct lp_type type, const void *res, const void *ref, double eps)
{
   unsigned i;
   eps *= type.floating ? 8.0 : 2.0;
   for (i = 0; i < type.length; ++i) {
      double res_elem = read_elem(type, res, i);
      double ref_elem = read_elem(type, ref, i);
      double delta = res_elem - ref_elem;
      if (ref_elem < -1.0 || ref_elem > 1.0) {
         delta /= ref_elem;
      }
      delta = fabs(delta);
      if (delta >= eps) {
         return false;
      }
   }

   return true;
}


bool
compare_vec(struct lp_type type, const void *res, const void *ref)
{
   double eps = lp_const_eps(type);
   return compare_vec_with_eps(type, res, ref, eps);
}


void
dump_vec(FILE *fp, struct lp_type type, const void *src)
{
   unsigned i;
   for (i = 0; i < type.length; ++i) {
      if (i)
         fprintf(fp, " ");
      if (type.floating) {
         double value;
         switch (type.width) {
         case 32:
            value = *((const float *)src + i);
            break;
         case 64:
            value = *((const double *)src + i);
            break;
         default:
            assert(0);
            value = 0.0;
         }
         fprintf(fp, "%f", value);
      } else {
         if (type.sign && !type.norm) {
            long long value;
            const char *format;
            switch (type.width) {
            case 8:
               value = *((const int8_t *)src + i);
               format = "%3lli";
               break;
            case 16:
               value = *((const int16_t *)src + i);
               format = "%5lli";
               break;
            case 32:
               value = *((const int32_t *)src + i);
               format = "%10lli";
               break;
            case 64:
               value = *((const int64_t *)src + i);
               format = "%20lli";
               break;
            default:
               assert(0);
               value = 0.0;
               format = "?";
            }
            fprintf(fp, format, value);
         } else {
            unsigned long long value;
            const char *format;
            switch (type.width) {
            case 8:
               value = *((const uint8_t *)src + i);
               format = type.norm ? "%2x" : "%4llu";
               break;
            case 16:
               value = *((const uint16_t *)src + i);
               format = type.norm ? "%4x" : "%6llx";
               break;
            case 32:
               value = *((const uint32_t *)src + i);
               format = type.norm ? "%8x" : "%11llx";
               break;
            case 64:
               value = *((const uint64_t *)src + i);
               format = type.norm ? "%16x" : "%21llx";
               break;
            default:
               assert(0);
               value = 0.0;
               format = "?";
            }
            fprintf(fp, format, value);
         }
      }
   }
}


int
main(int argc, char **argv)
{
   unsigned verbose = 0;
   FILE *fp = NULL;
   unsigned long n = 1000;
   unsigned i;
   bool success;
   bool single = false;
   unsigned fpstate;

   fpstate = util_fpstate_get();
   util_fpstate_set_denorms_to_zero(fpstate);

   if (!lp_build_init())
      return 1;

   for (i = 1; i < argc; ++i) {
      if (strcmp(argv[i], "-v") == 0)
         ++verbose;
      else if (strcmp(argv[i], "-s") == 0)
         single = true;
      else if (strcmp(argv[i], "-o") == 0)
         fp = fopen(argv[++i], "wt");
      else
         n = atoi(argv[i]);
   }

#if MESA_DEBUG
   if (verbose >= 2) {
      gallivm_debug |= GALLIVM_DEBUG_IR;
      gallivm_debug |= GALLIVM_DEBUG_ASM;
   }
#endif

   if (fp) {
      /* Warm up the caches */
      test_some(0, NULL, 100);

      write_tsv_header(fp);
   }

   if (single)
      success = test_single(verbose, fp);
   else if (n)
      success = test_some(verbose, fp, n);
   else
      success = test_all(verbose, fp);

   if (fp)
      fclose(fp);

   LLVMShutdown();

   return success ? 0 : 1;
}