mirror of git://gcc.gnu.org/git/gcc.git
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
/* go-type-complex.c -- hash and equality complex functions.
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Copyright 2012 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include <complex.h>
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#include <math.h>
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#include <stdint.h>
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#include <string.h>
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#include "runtime.h"
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#include "go-type.h"
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/* Hash function for float types. */
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uintptr_t
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__go_type_hash_complex (const void *vkey, uintptr_t key_size)
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{
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if (key_size == 8)
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{
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const complex float *cfp;
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complex float cf;
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float cfr;
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float cfi;
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uint64_t fi;
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cfp = (const complex float *) vkey;
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cf = *cfp;
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cfr = crealf (cf);
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cfi = cimagf (cf);
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if (isinf (cfr) || isinf (cfi))
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return 0;
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/* NaN != NaN, so the hash code of a NaN is irrelevant. Make it
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random so that not all NaNs wind up in the same place. */
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if (isnan (cfr) || isnan (cfi))
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return runtime_fastrand1 ();
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/* Avoid negative zero. */
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if (cfr == 0 && cfi == 0)
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return 0;
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else if (cfr == 0)
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cf = cfi * I;
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else if (cfi == 0)
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cf = cfr;
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memcpy (&fi, &cf, 8);
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return (uintptr_t) cfi;
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}
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else if (key_size == 16)
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{
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const complex double *cdp;
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complex double cd;
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double cdr;
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double cdi;
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uint64_t di[2];
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cdp = (const complex double *) vkey;
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cd = *cdp;
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cdr = creal (cd);
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cdi = cimag (cd);
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if (isinf (cdr) || isinf (cdi))
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return 0;
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if (isnan (cdr) || isnan (cdi))
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return runtime_fastrand1 ();
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/* Avoid negative zero. */
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if (cdr == 0 && cdi == 0)
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return 0;
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else if (cdr == 0)
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cd = cdi * I;
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else if (cdi == 0)
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cd = cdr;
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memcpy (&di, &cd, 16);
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return di[0] ^ di[1];
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}
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else
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runtime_throw ("__go_type_hash_complex: invalid complex size");
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}
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/* Equality function for complex types. */
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_Bool
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__go_type_equal_complex (const void *vk1, const void *vk2, uintptr_t key_size)
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{
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if (key_size == 8)
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{
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const complex float *cfp1;
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const complex float *cfp2;
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cfp1 = (const complex float *) vk1;
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cfp2 = (const complex float *) vk2;
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return *cfp1 == *cfp2;
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}
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else if (key_size == 16)
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{
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const complex double *cdp1;
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const complex double *cdp2;
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cdp1 = (const complex double *) vk1;
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cdp2 = (const complex double *) vk2;
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return *cdp1 == *cdp2;
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}
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else
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runtime_throw ("__go_type_equal_complex: invalid complex size");
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}
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