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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [runtime/] [go-type-identity.c] - Rev 756
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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" /* The 64-bit type. */ typedef unsigned 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. */ uintptr_t __go_type_hash_identity (const void *key, uintptr_t key_size) { uintptr_t ret; uintptr_t i; const unsigned char *p; if (key_size <= 8) { union { DItype v; unsigned char a[8]; } u; u.v = 0; __builtin_memcpy (&u.a, key, key_size); if (sizeof (uintptr_t) >= 8) return (uintptr_t) u.v; else return (uintptr_t) ((u.v >> 32) ^ (u.v & 0xffffffff)); } ret = 5381; for (i = 0, p = (const unsigned char *) key; i < key_size; i++, p++) ret = ret * 33 + *p; return ret; } /* 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, uintptr_t key_size) { return __builtin_memcmp (k1, k2, key_size) == 0; }
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