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runtime: Return random number of hash of NaN.

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From-SVN: r191632
This commit is contained in:
Ian Lance Taylor 2012-09-22 06:06:31 +00:00
parent a7a9045662
commit 2afc1e0b30
2 changed files with 22 additions and 6 deletions
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14
libgo/runtime/go-type-complex.c
View File

@ -32,10 +32,14 @@ __go_type_hash_complex (const void *vkey, uintptr_t key_size)
cf = ucf.cf;
cfr = __builtin_crealf (cf);
cfi = __builtin_cimagf (cf);
if (__builtin_isinff (cfr) || __builtin_isinff (cfi)
|| __builtin_isnanf (cfr) || __builtin_isnanf (cfi))
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;
@ -62,10 +66,12 @@ __go_type_hash_complex (const void *vkey, uintptr_t key_size)
cd = ucd.cd;
cdr = __builtin_crealf (cd);
cdi = __builtin_cimagf (cd);
if (__builtin_isinf (cdr) || __builtin_isinf (cdi)
|| __builtin_isnan (cdr) || __builtin_isnan (cdi))
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;

14
libgo/runtime/go-type-float.c
View File

@ -29,8 +29,14 @@ __go_type_hash_float (const void *vkey, uintptr_t key_size)
__builtin_memcpy (uf.a, vkey, 4);
f = uf.f;
if (__builtin_isinff (f) || __builtin_isnanf (f) || f == 0)
if (__builtin_isinff (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 (__builtin_isnanf (f))
return runtime_fastrand1 ();
return (uintptr_t) uf.si;
}
else if (key_size == 8)
@ -45,8 +51,12 @@ __go_type_hash_float (const void *vkey, uintptr_t key_size)
__builtin_memcpy (ud.a, vkey, 8);
d = ud.d;
if (__builtin_isinf (d) || __builtin_isnan (d) || d == 0)
if (__builtin_isinf (d) || d == 0)
return 0;
if (__builtin_isnan (d))
return runtime_fastrand1 ();
return (uintptr_t) ud.di;
}
else