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/* go-type-identity.c -- hash and equality identity functions.
Copyright 2009 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 <stddef.h>
#include "go-type.h"
/* Typedefs for accesses of different sizes. */
typedef int QItype __attribute__ ((mode (QI)));
typedef int HItype __attribute__ ((mode (HI)));
typedef int SItype __attribute__ ((mode (SI)));
typedef int DItype __attribute__ ((mode (DI)));
/* An identity hash function for a type. This is used for types where
we can simply use the type value itself as a hash code. This is
true of, e.g., integers and pointers. */
size_t
__go_type_hash_identity (const void *key, size_t key_size)
{
switch (key_size)
{
case 1:
return *(const QItype *) key;
case 2:
return *(const HItype *) key;
case 3:
case 4:
case 5:
case 6:
case 7:
return *(const SItype *) key;
default:
return *(const DItype *) key;
}
}
/* An identity equality function for a type. This is used for types
where we can check for equality by checking that the values have
the same bits. */
_Bool
__go_type_equal_identity (const void *k1, const void *k2, size_t key_size)
{
return __builtin_memcmp (k1, k2, key_size) == 0;
}
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