1
0
Fork 0
mirror of https://github.com/ruby/ruby.git synced 2022-11-09 12:17:21 -05:00

* bignum.c (str2big_poweroftwo): Extracted from rb_cstr_to_inum.

(str2big_normal): Ditto.
  (str2big_karatsuba): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42776 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2013-09-02 13:52:05 +00:00
parent 93ea04ecec
commit 5f61a592e9
2 changed files with 184 additions and 117 deletions

View file

@ -1,3 +1,9 @@
Mon Sep 2 22:49:15 2013 Tanaka Akira <akr@fsij.org>
* bignum.c (str2big_poweroftwo): Extracted from rb_cstr_to_inum.
(str2big_normal): Ditto.
(str2big_karatsuba): Ditto.
Mon Sep 2 17:53:33 2013 Nobuyoshi Nakada <nobu@ruby-lang.org> Mon Sep 2 17:53:33 2013 Nobuyoshi Nakada <nobu@ruby-lang.org>
* parse.y (str_suffix_gen): String#b creates new string object, use * parse.y (str_suffix_gen): String#b creates new string object, use

295
bignum.c
View file

@ -3567,6 +3567,176 @@ rb_quad_unpack(const char *buf, int signed_p)
(signed_p ? INTEGER_PACK_2COMP : 0)); (signed_p ? INTEGER_PACK_2COMP : 0));
} }
#define conv_digit(c) (ruby_digit36_to_number_table[(unsigned char)(c)])
static VALUE
str2big_poweroftwo(
int sign,
const char *digits_start,
const char *digits_end,
size_t num_digits,
int bits_per_digit)
{
BDIGIT *dp;
BDIGIT_DBL dd;
int numbits;
size_t num_bdigits;
const char *p;
int c;
VALUE z;
num_bdigits = (num_digits / BITSPERDIG) * bits_per_digit + roomof((num_digits % BITSPERDIG) * bits_per_digit, BITSPERDIG);
z = bignew(num_bdigits, sign);
dp = BDIGITS(z);
dd = 0;
numbits = 0;
for (p = digits_end; digits_start < p; p--) {
if ((c = conv_digit(p[-1])) < 0)
continue;
dd |= (BDIGIT_DBL)c << numbits;
numbits += bits_per_digit;
if (BITSPERDIG <= numbits) {
*dp++ = BIGLO(dd);
dd = BIGDN(dd);
numbits -= BITSPERDIG;
}
}
if (numbits) {
*dp++ = BIGLO(dd);
}
assert((size_t)(dp - BDIGITS(z)) == num_bdigits);
return z;
}
static VALUE
str2big_normal(
int sign,
const char *digits_start,
const char *digits_end,
size_t num_bdigits,
int base)
{
size_t blen = 1;
BDIGIT *zds;
BDIGIT_DBL num;
size_t i;
const char *p;
int c;
VALUE z;
z = bignew(num_bdigits, sign);
zds = BDIGITS(z);
BDIGITS_ZERO(zds, num_bdigits);
for (p = digits_start; p < digits_end; p++) {
if ((c = conv_digit(*p)) < 0)
continue;
num = c;
i = 0;
for (;;) {
while (i<blen) {
num += (BDIGIT_DBL)zds[i]*base;
zds[i++] = BIGLO(num);
num = BIGDN(num);
}
if (num) {
blen++;
continue;
}
break;
}
assert(blen <= num_bdigits);
}
return z;
}
static VALUE
str2big_karatsuba(
int sign,
const char *digits_start,
const char *digits_end,
size_t num_digits,
size_t num_bdigits,
int digits_per_bdigits_dbl,
int base)
{
VALUE powerv;
size_t unit;
VALUE tmpuv = 0;
BDIGIT *uds, *vds, *tds;
BDIGIT_DBL dd;
BDIGIT_DBL current_base;
int m;
int power_level = 0;
size_t i;
const char *p;
int c;
VALUE z;
uds = ALLOCV_N(BDIGIT, tmpuv, 2*num_bdigits);
vds = uds + num_bdigits;
powerv = power_cache_get_power(base, power_level, NULL);
i = 0;
dd = 0;
current_base = 1;
m = digits_per_bdigits_dbl;
if (num_digits < (size_t)m)
m = (int)num_digits;
for (p = digits_end; digits_start < p; p--) {
if ((c = conv_digit(p[-1])) < 0)
continue;
dd = dd + c * current_base;
current_base *= base;
num_digits--;
m--;
if (m == 0) {
uds[i++] = BIGLO(dd);
uds[i++] = (BDIGIT)BIGDN(dd);
dd = 0;
m = digits_per_bdigits_dbl;
if (num_digits < (size_t)m)
m = (int)num_digits;
current_base = 1;
}
}
assert(i == num_bdigits);
for (unit = 2; unit < num_bdigits; unit *= 2) {
for (i = 0; i < num_bdigits; i += unit*2) {
if (2*unit <= num_bdigits - i) {
bary_mul(vds+i, unit*2, BDIGITS(powerv), RBIGNUM_LEN(powerv), uds+i+unit, unit);
bary_add(vds+i, unit*2, vds+i, unit*2, uds+i, unit);
}
else if (unit <= num_bdigits - i) {
bary_mul(vds+i, num_bdigits-i, BDIGITS(powerv), RBIGNUM_LEN(powerv), uds+i+unit, num_bdigits-(i+unit));
bary_add(vds+i, num_bdigits-i, vds+i, num_bdigits-i, uds+i, unit);
}
else {
MEMCPY(vds+i, uds+i, BDIGIT, num_bdigits-i);
}
}
power_level++;
powerv = power_cache_get_power(base, power_level, NULL);
tds = vds;
vds = uds;
uds = tds;
}
BARY_TRUNC(uds, num_bdigits);
z = bignew(num_bdigits, sign);
MEMCPY(BDIGITS(z), uds, BDIGIT, num_bdigits);
if (tmpuv)
ALLOCV_END(tmpuv);
return z;
}
VALUE VALUE
rb_cstr_to_inum(const char *str, int base, int badcheck) rb_cstr_to_inum(const char *str, int base, int badcheck)
{ {
@ -3576,15 +3746,13 @@ rb_cstr_to_inum(const char *str, int base, int badcheck)
VALUE z; VALUE z;
int bits_per_digit; int bits_per_digit;
size_t i;
const char *digits_start, *digits_end, *p; const char *digits_start, *digits_end;
size_t num_digits; size_t num_digits;
size_t num_bdigits; size_t num_bdigits;
#undef ISDIGIT #undef ISDIGIT
#define ISDIGIT(c) ('0' <= (c) && (c) <= '9') #define ISDIGIT(c) ('0' <= (c) && (c) <= '9')
#define conv_digit(c) (ruby_digit36_to_number_table[(unsigned char)(c)])
if (!str) { if (!str) {
if (badcheck) goto bad; if (badcheck) goto bad;
@ -3699,6 +3867,7 @@ rb_cstr_to_inum(const char *str, int base, int badcheck)
return bignorm(big); return bignorm(big);
} }
} }
bigparse: bigparse:
if (badcheck && *str == '_') goto bad; if (badcheck && *str == '_') goto bad;
@ -3732,29 +3901,8 @@ rb_cstr_to_inum(const char *str, int base, int badcheck)
} }
if (POW2_P(base)) { if (POW2_P(base)) {
BDIGIT *dp; z = str2big_poweroftwo(sign, digits_start, digits_end, num_digits,
BDIGIT_DBL dd; bits_per_digit);
int numbits;
num_bdigits = (num_digits / BITSPERDIG) * bits_per_digit + roomof((num_digits % BITSPERDIG) * bits_per_digit, BITSPERDIG);
z = bignew(num_bdigits, sign);
dp = BDIGITS(z);
dd = 0;
numbits = 0;
for (p = digits_end; digits_start < p; p--) {
if ((c = conv_digit(p[-1])) < 0)
continue;
dd |= (BDIGIT_DBL)c << numbits;
numbits += bits_per_digit;
if (BITSPERDIG <= numbits) {
*dp++ = BIGLO(dd);
dd = BIGDN(dd);
numbits -= BITSPERDIG;
}
}
if (numbits) {
*dp++ = BIGLO(dd);
}
assert((size_t)(dp - BDIGITS(z)) == num_bdigits);
} }
else { else {
int digits_per_bdigits_dbl; int digits_per_bdigits_dbl;
@ -3762,99 +3910,12 @@ rb_cstr_to_inum(const char *str, int base, int badcheck)
num_bdigits = roomof(num_digits, digits_per_bdigits_dbl)*2; num_bdigits = roomof(num_digits, digits_per_bdigits_dbl)*2;
if (num_bdigits < KARATSUBA_MUL_DIGITS) { if (num_bdigits < KARATSUBA_MUL_DIGITS) {
size_t blen = 1; z = str2big_normal(sign, digits_start, digits_end,
BDIGIT *zds; num_bdigits, base);
BDIGIT_DBL num;
z = bignew(num_bdigits, sign);
zds = BDIGITS(z);
BDIGITS_ZERO(zds, num_bdigits);
for (p = digits_start; p < digits_end; p++) {
if ((c = conv_digit(*p)) < 0)
continue;
num = c;
i = 0;
for (;;) {
while (i<blen) {
num += (BDIGIT_DBL)zds[i]*base;
zds[i++] = BIGLO(num);
num = BIGDN(num);
}
if (num) {
blen++;
continue;
}
break;
}
assert(blen <= num_bdigits);
}
} }
else { else {
VALUE powerv; z = str2big_karatsuba(sign, digits_start, digits_end, num_digits,
size_t unit; num_bdigits, digits_per_bdigits_dbl, base);
VALUE tmpuv = 0;
BDIGIT *uds, *vds, *tds;
BDIGIT_DBL dd;
BDIGIT_DBL current_base;
int m;
int power_level = 0;
uds = ALLOCV_N(BDIGIT, tmpuv, 2*num_bdigits);
vds = uds + num_bdigits;
powerv = power_cache_get_power(base, power_level, NULL);
i = 0;
dd = 0;
current_base = 1;
m = digits_per_bdigits_dbl;
if (num_digits < (size_t)m)
m = (int)num_digits;
for (p = digits_end; digits_start < p; p--) {
if ((c = conv_digit(p[-1])) < 0)
continue;
dd = dd + c * current_base;
current_base *= base;
num_digits--;
m--;
if (m == 0) {
uds[i++] = BIGLO(dd);
uds[i++] = (BDIGIT)BIGDN(dd);
dd = 0;
m = digits_per_bdigits_dbl;
if (num_digits < (size_t)m)
m = (int)num_digits;
current_base = 1;
}
}
assert(i == num_bdigits);
for (unit = 2; unit < num_bdigits; unit *= 2) {
for (i = 0; i < num_bdigits; i += unit*2) {
if (2*unit <= num_bdigits - i) {
bary_mul(vds+i, unit*2, BDIGITS(powerv), RBIGNUM_LEN(powerv), uds+i+unit, unit);
bary_add(vds+i, unit*2, vds+i, unit*2, uds+i, unit);
}
else if (unit <= num_bdigits - i) {
bary_mul(vds+i, num_bdigits-i, BDIGITS(powerv), RBIGNUM_LEN(powerv), uds+i+unit, num_bdigits-(i+unit));
bary_add(vds+i, num_bdigits-i, vds+i, num_bdigits-i, uds+i, unit);
}
else {
MEMCPY(vds+i, uds+i, BDIGIT, num_bdigits-i);
}
}
power_level++;
powerv = power_cache_get_power(base, power_level, NULL);
tds = vds;
vds = uds;
uds = tds;
}
BARY_TRUNC(uds, num_bdigits);
z = bignew(num_bdigits, sign);
MEMCPY(BDIGITS(z), uds, BDIGIT, num_bdigits);
if (tmpuv)
ALLOCV_END(tmpuv);
} }
} }