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/* go-type-complex.c -- hash and equality complex 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 64-bit type. */
typedef unsigned int DItype __attribute__ ((mode (DI)));
/* Hash function for float types. */
uintptr_t
__go_type_hash_complex (const void *vkey, uintptr_t key_size)
{
if (key_size == 8)
{
union
{
unsigned char a[8];
__complex float cf;
DItype di;
} ucf;
__complex float cf;
float cfr;
float cfi;
__builtin_memcpy (ucf.a, vkey, 8);
cf = ucf.cf;
cfr = __builtin_crealf (cf);
cfi = __builtin_cimagf (cf);
if (__builtin_isinff (cfr) || __builtin_isinff (cfi))
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 (__builtin_isnanf (cfr) || __builtin_isnanf (cfi))
return runtime_fastrand1 ();
/* Avoid negative zero. */
if (cfr == 0 && cfi == 0)
return 0;
else if (cfr == 0)
ucf.cf = cfi * 1.0iF;
else if (cfi == 0)
ucf.cf = cfr;
return ucf.di;
}
else if (key_size == 16)
{
union
{
unsigned char a[16];
__complex double cd;
DItype adi[2];
} ucd;
__complex double cd;
double cdr;
double cdi;
__builtin_memcpy (ucd.a, vkey, 16);
cd = ucd.cd;
cdr = __builtin_crealf (cd);
cdi = __builtin_cimagf (cd);
if (__builtin_isinf (cdr) || __builtin_isinf (cdi))
return 0;
if (__builtin_isnan (cdr) || __builtin_isnan (cdi))
return runtime_fastrand1 ();
/* Avoid negative zero. */
if (cdr == 0 && cdi == 0)
return 0;
else if (cdr == 0)
ucd.cd = cdi * 1.0i;
else if (cdi == 0)
ucd.cd = cdr;
return ucd.adi[0] ^ ucd.adi[1];
}
else
runtime_throw ("__go_type_hash_complex: invalid complex size");
}
/* Equality function for complex types. */
_Bool
__go_type_equal_complex (const void *vk1, const void *vk2, uintptr_t key_size)
{
if (key_size == 8)
{
union
{
unsigned char a[8];
__complex float cf;
} ucf;
__complex float cf1;
__complex float cf2;
__builtin_memcpy (ucf.a, vk1, 8);
cf1 = ucf.cf;
__builtin_memcpy (ucf.a, vk2, 8);
cf2 = ucf.cf;
return cf1 == cf2;
}
else if (key_size == 16)
{
union
{
unsigned char a[16];
__complex double cd;
} ucd;
__complex double cd1;
__complex double cd2;
__builtin_memcpy (ucd.a, vk1, 16);
cd1 = ucd.cd;
__builtin_memcpy (ucd.a, vk2, 16);
cd2 = ucd.cd;
return cd1 == cd2;
}
else
runtime_throw ("__go_type_equal_complex: invalid complex size");
}
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