mirror of git://gcc.gnu.org/git/gcc.git
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
/* 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 <math.h>
|
|
#include <stdint.h>
|
|
#include "runtime.h"
|
|
#include "go-type.h"
|
|
|
|
/* Hash function for float types. */
|
|
|
|
uintptr_t
|
|
__go_type_hash_float (const void *vkey, uintptr_t key_size)
|
|
{
|
|
if (key_size == 4)
|
|
{
|
|
const float *fp;
|
|
float f;
|
|
uint32_t si;
|
|
|
|
fp = (const float *) vkey;
|
|
f = *fp;
|
|
|
|
if (isinf (f) || f == 0)
|
|
return 0;
|
|
|
|
/* NaN != NaN, so the hash code of a NaN is irrelevant. Make it
|
|
random so that not all NaNs wind up in the same place. */
|
|
if (isnan (f))
|
|
return runtime_fastrand1 ();
|
|
|
|
memcpy (&si, vkey, 4);
|
|
return (uintptr_t) si;
|
|
}
|
|
else if (key_size == 8)
|
|
{
|
|
const double *dp;
|
|
double d;
|
|
uint64_t di;
|
|
|
|
dp = (const double *) vkey;
|
|
d = *dp;
|
|
|
|
if (isinf (d) || d == 0)
|
|
return 0;
|
|
|
|
if (isnan (d))
|
|
return runtime_fastrand1 ();
|
|
|
|
memcpy (&di, vkey, 8);
|
|
return (uintptr_t) di;
|
|
}
|
|
else
|
|
runtime_throw ("__go_type_hash_float: invalid float size");
|
|
}
|
|
|
|
const FuncVal __go_type_hash_float_descriptor =
|
|
{ (void *) __go_type_hash_float };
|
|
|
|
/* Equality function for float types. */
|
|
|
|
_Bool
|
|
__go_type_equal_float (const void *vk1, const void *vk2, uintptr_t key_size)
|
|
{
|
|
if (key_size == 4)
|
|
{
|
|
const float *fp1;
|
|
const float *fp2;
|
|
|
|
fp1 = (const float *) vk1;
|
|
fp2 = (const float *) vk2;
|
|
|
|
return *fp1 == *fp2;
|
|
}
|
|
else if (key_size == 8)
|
|
{
|
|
const double *dp1;
|
|
const double *dp2;
|
|
|
|
dp1 = (const double *) vk1;
|
|
dp2 = (const double *) vk2;
|
|
|
|
return *dp1 == *dp2;
|
|
}
|
|
else
|
|
runtime_throw ("__go_type_equal_float: invalid float size");
|
|
}
|
|
|
|
const FuncVal __go_type_equal_float_descriptor =
|
|
{ (void *) __go_type_equal_float };
|