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* bignum.c (get2comp): revert all prior changes, and calculate

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proper 2's complement for negative numbers.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8591 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
matz 2005-06-08 02:16:35 +00:00
parent 17920c7a9e
commit 5ef43814a8
2 changed files with 36 additions and 15 deletions
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10
ChangeLog
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@ -1,3 +1,8 @@
Wed Jun 8 11:11:34 2005 Yukihiro Matsumoto <matz@ruby-lang.org>
* bignum.c (get2comp): revert all prior changes, and calculate
proper 2's complement for negative numbers.
Wed Jun 8 08:33:10 2005 Nobuyoshi Nakada <nobu@ruby-lang.org>
* enum.c (enum_min_by, enum_max_by): return nil if no iteration.
@ -11,7 +16,10 @@ Wed Jun 8 01:27:06 2005 Yukihiro Matsumoto <matz@ruby-lang.org>
* bignum.c (bignorm): fixed a bug in normalizing negative numbers
reported from Honda Hiroki <hhonda@ipflex.com>. normalizing
should not trim preceding zeros from negative numbers.
should not trim leading zeros from negative numbers.
* bignum.c (rb_cstr_to_inum): must remove leading zeros for this
case.
Wed Jun 8 00:15:08 2005 Yukihiro Matsumoto <matz@ruby-lang.org>

41
bignum.c
View file

@ -85,7 +85,7 @@ get2comp(x, carry) /* get 2's complement */
if ((ds[RBIGNUM(x)->len-1] & (1<<(BITSPERDIG-1))) == 0) {
REALLOC_N(RBIGNUM(x)->digits, BDIGIT, ++RBIGNUM(x)->len);
ds = BDIGITS(x);
ds[RBIGNUM(x)->len-1] = ~0;
ds[RBIGNUM(x)->len-1] = RBIGNUM(x)->sign ? ~0 : 1;
}
}
@ -105,15 +105,9 @@ bignorm(x)
BDIGIT *ds = BDIGITS(x);
while (len-- && !ds[len]) ;
len++;
if (RBIGNUM(x)->sign) {
RBIGNUM(x)->len = len;
}
else if (len == 0) {
return x;
}
RBIGNUM(x)->len = ++len;
if (RBIGNUM(x)->len*SIZEOF_BDIGITS <= sizeof(VALUE)) {
if (len*SIZEOF_BDIGITS <= sizeof(VALUE)) {
long num = 0;
while (len--) {
num = BIGUP(num) + ds[len];
@ -1063,11 +1057,30 @@ rb_big_neg(x)
VALUE z = rb_big_clone(x);
long i = RBIGNUM(x)->len;
BDIGIT *ds = BDIGITS(z);
int nz = 0;
if (!RBIGNUM(x)->sign) get2comp(z, Qtrue);
while (i--) ds[i] = ~ds[i];
if (RBIGNUM(x)->sign) get2comp(z, Qfalse);
while (i--) {
ds[i] = ~ds[i];
}
RBIGNUM(z)->sign = !RBIGNUM(z)->sign;
if (RBIGNUM(x)->sign) get2comp(z, Qtrue);
#if 0
i = RBIGNUM(x)->len;
if (RBIGNUM(x)->sign) {
while (i--) {
if (ds[i]) nz = Qtrue;
}
if (!nz) {
z = bignew(RBIGNUM(x)->len+1, 1);
for (i=0; i<RBIGNUM(x)->len; i++) {
BDIGITS(z)[i] = BDIGITS(x)[i];
}
BDIGITS(z)[i] = 1;
BDIGITS(z)[0] = 0;
}
}
#endif
return bignorm(z);
}
@ -1688,7 +1701,7 @@ rb_big_and(xx, yy)
for (; i<l2; i++) {
zds[i] = sign?0:ds2[i];
}
if (!RBIGNUM(z)->sign) get2comp(z, Qfalse);
if (!RBIGNUM(z)->sign) get2comp(z, Qtrue);
return bignorm(z);
}
@ -1745,7 +1758,7 @@ rb_big_or(xx, yy)
for (; i<l2; i++) {
zds[i] = sign?ds2[i]:(BIGRAD-1);
}
if (!RBIGNUM(z)->sign) get2comp(z, Qfalse);
if (!RBIGNUM(z)->sign) get2comp(z, Qtrue);
return bignorm(z);
}
@ -1806,7 +1819,7 @@ rb_big_xor(xx, yy)
for (; i<l2; i++) {
zds[i] = sign?ds2[i]:~ds2[i];
}
if (!RBIGNUM(z)->sign) get2comp(z, Qfalse);
if (!RBIGNUM(z)->sign) get2comp(z, Qtrue);
return bignorm(z);
}