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* bignum.c (bary_small_rshift): Specify the higher BDIGIT instead of

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sign bit.
  (big_shift3): Follow the above change.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42575 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2013-08-16 00:19:51 +00:00
parent d0b5d2016d
commit 9f6c62ad5f
2 changed files with 9 additions and 5 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
Fri Aug 16 09:17:00 2013 Tanaka Akira <akr@fsij.org>
* bignum.c (bary_small_rshift): Specify the higher BDIGIT instead of
sign bit.
(big_shift3): Follow the above change.
Fri Aug 16 02:20:39 2013 Tanaka Akira <akr@fsij.org>
* bignum.c (bary_mul_toom3): Reduce a branch.

8
bignum.c
View file

@ -567,16 +567,14 @@ bary_small_lshift(BDIGIT *zds, const BDIGIT *xds, size_t n, int shift)
}
static void
bary_small_rshift(BDIGIT *zds, const BDIGIT *xds, size_t n, int shift, int sign_bit)
bary_small_rshift(BDIGIT *zds, const BDIGIT *xds, size_t n, int shift, BDIGIT higher_bdigit)
{
BDIGIT_DBL num = 0;
BDIGIT x;
assert(0 <= shift && shift < BITSPERDIG);
if (sign_bit) {
num = (~(BDIGIT_DBL)0) << BITSPERDIG;
}
num = BIGUP(higher_bdigit);
while (n--) {
num = (num | xds[n]) >> shift;
x = xds[n];
@ -4120,7 +4118,7 @@ big_shift3(VALUE x, int lshift_p, size_t shift_numdigits, int shift_numbits)
zn = xn - s1;
z = bignew(zn, 0);
zds = BDIGITS(z);
bary_small_rshift(zds, xds+s1, zn, s2, hibitsx != 0);
bary_small_rshift(zds, xds+s1, zn, s2, hibitsx != 0 ? BDIGMAX : 0);
twocomp2abs_bang(z, hibitsx != 0);
}
RB_GC_GUARD(x);