730f6d1425
Change the type descriptor hash and equal functions from C code pointers
to Go func values. This permits them to be set to a Go function
closure. This is in preparation for the Go 1.5, so that we can use a
closure for the hash/equal functions returned by the new reflect.ArrayOf
function.
Reviewed-on: https://go-review.googlesource.com/16485
From-SVN: r229541
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
/* go-type-float.c -- hash and equality float 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 <math.h>
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#include <stdint.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_float (const void *vkey, uintptr_t key_size)
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{
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if (key_size == 4)
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{
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const float *fp;
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float f;
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uint32_t si;
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fp = (const float *) vkey;
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f = *fp;
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if (isinf (f) || f == 0)
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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 (f))
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return runtime_fastrand1 ();
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memcpy (&si, vkey, 4);
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return (uintptr_t) si;
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}
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else if (key_size == 8)
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{
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const double *dp;
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double d;
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uint64_t di;
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dp = (const double *) vkey;
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d = *dp;
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if (isinf (d) || d == 0)
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return 0;
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if (isnan (d))
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return runtime_fastrand1 ();
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memcpy (&di, vkey, 8);
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return (uintptr_t) di;
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}
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else
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runtime_throw ("__go_type_hash_float: invalid float size");
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}
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const FuncVal __go_type_hash_float_descriptor =
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{ (void *) __go_type_hash_float };
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/* Equality function for float types. */
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_Bool
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__go_type_equal_float (const void *vk1, const void *vk2, uintptr_t key_size)
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{
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if (key_size == 4)
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{
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const float *fp1;
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const float *fp2;
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fp1 = (const float *) vk1;
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fp2 = (const float *) vk2;
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return *fp1 == *fp2;
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}
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else if (key_size == 8)
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{
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const double *dp1;
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const double *dp2;
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dp1 = (const double *) vk1;
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dp2 = (const double *) vk2;
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return *dp1 == *dp2;
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}
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else
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runtime_throw ("__go_type_equal_float: invalid float size");
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}
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const FuncVal __go_type_equal_float_descriptor =
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{ (void *) __go_type_equal_float };
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