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* random.c (int_pair_to_real_inclusive): Use rb_integer_pack.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41161 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2013-06-08 02:18:14 +00:00
parent 479b17ed12
commit 8ca1e1238e
2 changed files with 9 additions and 15 deletions
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ChangeLog
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@ -1,3 +1,7 @@
Sat Jun 8 11:17:39 2013 Tanaka Akira <akr@fsij.org>
* random.c (int_pair_to_real_inclusive): Use rb_integer_pack.
Sat Jun 8 09:49:42 2013 Tanaka Akira <akr@fsij.org>
* random.c (int_pair_to_real_inclusive): Use rb_integer_unpack.

20
random.c
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@ -302,21 +302,11 @@ int_pair_to_real_inclusive(uint32_t a, uint32_t b)
#endif
}
else {
#if 64 % BITSPERDIG == 0
long len = RBIGNUM_LEN(x);
BDIGIT *xd = BDIGITS(x);
MEMMOVE(xd, xd + 64 / BITSPERDIG, BDIGIT, len - 64 / BITSPERDIG);
MEMZERO(xd + len - 64 / BITSPERDIG, BDIGIT, 64 / BITSPERDIG);
r = rb_big2dbl(x);
#else
x = rb_big_rshift(x, INT2FIX(64));
if (FIXNUM_P(x)) {
r = (double)FIX2ULONG(x);
}
else {
r = rb_big2dbl(x);
}
#endif
uint32_t uary[4];
rb_integer_pack(x, NULL, NULL, uary, numberof(uary), sizeof(uint32_t), 0,
INTEGER_PACK_MSWORD_FIRST|INTEGER_PACK_NATIVE_BYTE_ORDER);
/* r = x >> 64 */
r = (double)uary[0] * (0x10000 * (double)0x10000) + (double)uary[1];
}
return ldexp(r, -53);
}