1 /* go-type-float.c -- hash and equality float functions.
3 Copyright 2012 The Go Authors. All rights reserved.
4 Use of this source code is governed by a BSD-style
5 license that can be found in the LICENSE file. */
10 /* The 32-bit and 64-bit types. */
12 typedef unsigned int SItype __attribute__ ((mode (SI)));
13 typedef unsigned int DItype __attribute__ ((mode (DI)));
15 /* Hash function for float types. */
18 __go_type_hash_float (const void *vkey, uintptr_t key_size)
30 __builtin_memcpy (uf.a, vkey, 4);
32 if (__builtin_isinff (f) || f == 0)
35 /* NaN != NaN, so the hash code of a NaN is irrelevant. Make it
36 random so that not all NaNs wind up in the same place. */
37 if (__builtin_isnanf (f))
38 return runtime_fastrand1 ();
40 return (uintptr_t) uf.si;
42 else if (key_size == 8)
52 __builtin_memcpy (ud.a, vkey, 8);
54 if (__builtin_isinf (d) || d == 0)
57 if (__builtin_isnan (d))
58 return runtime_fastrand1 ();
60 return (uintptr_t) ud.di;
63 runtime_throw ("__go_type_hash_float: invalid float size");
66 /* Equality function for float types. */
69 __go_type_equal_float (const void *vk1, const void *vk2, uintptr_t key_size)
81 __builtin_memcpy (uf.a, vk1, 4);
83 __builtin_memcpy (uf.a, vk2, 4);
87 else if (key_size == 8)
98 __builtin_memcpy (ud.a, vk1, 8);
100 __builtin_memcpy (ud.a, vk2, 8);
105 runtime_throw ("__go_type_equal_float: invalid float size");