factor: factor2 variable is unused now, drop it

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

1 files changed, 0 insertions, 6 deletions

diff --git a/coreutils/factor.c b/coreutils/factor.c
index 1c01e3f27..85284aa27 100644
--- a/coreutils/factor.c
+++ b/coreutils/factor.c
@@ -89,7 +89,6 @@ static NOINLINE half_t isqrt_odd(wide_t N)
 
 static NOINLINE void factorize(wide_t N)
 {
-        wide_t factor2;
         half_t factor;
         half_t max_factor;
         unsigned count3;
@@ -105,7 +104,6 @@ static NOINLINE void factorize(wide_t N)
         max_factor = isqrt_odd(N);
         count3 = 3;
         factor = 3;
-        factor2 = 3 * 3;
         for (;;) {
                 /* The division is the most costly part of the loop.
                  * On 64bit CPUs, takes at best 12 cycles, often ~20.
@@ -118,10 +116,6 @@ static NOINLINE void factorize(wide_t N)
  next_factor:
                 if (factor >= max_factor)
                         break;
-                /* (f + 2)^2 = f^2 + 4*f + 4 = f^2 + 4*(f+1) */
-                factor2 = factor2 + 4 * (factor + 1);
-                /* overflow is impossible due to max_factor check */
-                /* (factor2 > N) is impossible due to max_factor check */
                 factor += 2;
                 /* Rudimentary wheel sieving: skip multiples of 3:
                  * Every third odd number is divisible by three and thus isn't a prime: