bc: bc_num_k(): move carry,i,j,len to inner scope

This might help compiler

function                                             old     new   delta
bc_num_k                                             957     971     +14

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 9 insertions, 6 deletions

diff --git a/miscutils/bc.c b/miscutils/bc.c
index a78446d04..ea200ebda 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -1639,16 +1639,16 @@ static BcStatus bc_num_k(BcNum *restrict a, BcNum *restrict b,
                          BcNum *restrict c)
 {
         BcStatus s;
-        int carry;
-        size_t i, j, len, max = BC_MAX(a->len, b->len), max2 = (max + 1) / 2;
+        size_t max = BC_MAX(a->len, b->len), max2 = (max + 1) / 2;
         BcNum l1, h1, l2, h2, m2, m1, z0, z1, z2, temp;
-        bool aone = BC_NUM_ONE(a);
+        bool aone;
 
         if (a->len == 0 || b->len == 0) {
                 bc_num_zero(c);
                 return BC_STATUS_SUCCESS;
         }
-        else if (aone || BC_NUM_ONE(b)) {
+        aone = BC_NUM_ONE(a);
+        if (aone || BC_NUM_ONE(b)) {
                 bc_num_copy(c, aone ? b : a);
                 return BC_STATUS_SUCCESS;
         }
@@ -1656,13 +1656,17 @@ static BcStatus bc_num_k(BcNum *restrict a, BcNum *restrict b,
         if (a->len + b->len < BC_NUM_KARATSUBA_LEN ||
             a->len < BC_NUM_KARATSUBA_LEN || b->len < BC_NUM_KARATSUBA_LEN)
         {
+                size_t i, j, len;
+                int carry;
+
                 bc_num_expand(c, a->len + b->len + 1);
 
                 memset(c->num, 0, sizeof(BcDig) * c->cap);
-                c->len = carry = len = 0;
+                c->len = len = 0;
 
                 for (i = 0; i < b->len; ++i) {
 
+                        carry = 0;
                         for (j = 0; j < a->len; ++j) {
                                 int in = (int) c->num[i + j];
                                 in += ((int) a->num[j]) * ((int) b->num[i]) + carry;
@@ -1672,7 +1676,6 @@ static BcStatus bc_num_k(BcNum *restrict a, BcNum *restrict b,
 
                         c->num[i + j] += (BcDig) carry;
                         len = BC_MAX(len, i + j + !!carry);
-                        carry = 0;
                 }
 
                 c->len = len;