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/* go-type-float.c -- hash and equality float functions.

   Copyright 2012 The Go Authors. All rights reserved.

   Use of this source code is governed by a BSD-style

   license that can be found in the LICENSE file.  */

#include "runtime.h"

#include "go-type.h"

/* The 32-bit and 64-bit types.  */

typedef unsigned int SItype __attribute__ ((mode (SI)));

typedef unsigned int DItype __attribute__ ((mode (DI)));

/* Hash function for float types.  */

uintptr_t

__go_type_hash_float (const void *vkey, uintptr_t key_size)

{

  if (key_size == 4)

    {

      union

      {

        unsigned char a[4];

        float f;

        SItype si;

      } uf;

      float f;

      __builtin_memcpy (uf.a, vkey, 4);

      f = uf.f;

      if (__builtin_isinff (f) || __builtin_isnanf (f) || f == 0)

        return 0;

      return (uintptr_t) uf.si;

    }

  else if (key_size == 8)

    {

      union

      {

        unsigned char a[8];

        double d;

        DItype di;

      } ud;

      double d;

      __builtin_memcpy (ud.a, vkey, 8);

      d = ud.d;

      if (__builtin_isinf (d) || __builtin_isnan (d) || d == 0)

        return 0;

      return (uintptr_t) ud.di;

    }

  else

    runtime_throw ("__go_type_hash_float: invalid float size");

}

/* Equality function for float types.  */

_Bool

__go_type_equal_float (const void *vk1, const void *vk2, uintptr_t key_size)

{

  if (key_size == 4)

    {

      union

      {

        unsigned char a[4];

        float f;

      } uf;

      float f1;

      float f2;

      __builtin_memcpy (uf.a, vk1, 4);

      f1 = uf.f;

      __builtin_memcpy (uf.a, vk2, 4);

      f2 = uf.f;

      return f1 == f2;

    }

  else if (key_size == 8)

    {

      union

      {

        unsigned char a[8];

        double d;

        DItype di;

      } ud;

      double d1;

      double d2;

      __builtin_memcpy (ud.a, vk1, 8);

      d1 = ud.d;

      __builtin_memcpy (ud.a, vk2, 8);

      d2 = ud.d;

      return d1 == d2;

    }

  else

    runtime_throw ("__go_type_equal_float: invalid float size");

}