Update COUNT_UNSET_BIT()

kimwalisch · Jul 3, 2022 · 0e2177d · 0e2177d
1 parent 2439921
commit 0e2177d
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/src/Sieve.cpp b/src/Sieve.cpp
@@ -588,11 +588,11 @@ void Sieve::cross_off_count(uint64_t prime, uint64_t i)
   #define COUNT_UNSET_BIT(bit_index) \
     { \
       std::size_t sieve_byte = sieve[m]; \
-      std::size_t is_bit = (sieve_byte >> bit_index) & 1; \
-      sieve_byte &= ~(1 << bit_index); \
+      std::size_t bit = sieve_byte & (1 << bit_index); \
+      std::size_t is_bit = bit >> bit_index; \
+      sieve[m] = (uint8_t) (sieve_byte - bit); \
       counter[m >> counter_log2_dist] -= (uint32_t) is_bit; \
       total_count -= is_bit; \
-      sieve[m] = (uint8_t) sieve_byte; \
     }
 
   switch (wheel.index)