diff options
Diffstat (limited to 'ext/bcmath/libbcmath/src')
| -rw-r--r-- | ext/bcmath/libbcmath/src/raisemod.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/ext/bcmath/libbcmath/src/raisemod.c b/ext/bcmath/libbcmath/src/raisemod.c index 72a838a364..84a7321ea7 100644 --- a/ext/bcmath/libbcmath/src/raisemod.c +++ b/ext/bcmath/libbcmath/src/raisemod.c @@ -75,17 +75,24 @@ bc_raisemod (bc_num base, bc_num expo, bc_num mod, bc_num *result, int scale) /* Do the calculation. */ rscale = MAX(scale, base->n_scale); - while ( !bc_is_zero(exponent) ) + if ( !bc_compare(mod, BCG(_one_)) ) { - (void) bc_divmod (exponent, BCG(_two_), &exponent, &parity, 0); - if ( !bc_is_zero(parity) ) + temp = bc_new_num (1, scale); + } + else + { + while ( !bc_is_zero(exponent) ) { - bc_multiply (temp, power, &temp, rscale); - (void) bc_modulo (temp, mod, &temp, scale); + (void) bc_divmod (exponent, BCG(_two_), &exponent, &parity, 0); + if ( !bc_is_zero(parity) ) + { + bc_multiply (temp, power, &temp, rscale); + (void) bc_modulo (temp, mod, &temp, scale); + } + + bc_multiply (power, power, &power, rscale); + (void) bc_modulo (power, mod, &power, scale); } - - bc_multiply (power, power, &power, rscale); - (void) bc_modulo (power, mod, &power, scale); } /* Assign the value. */ |