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--- chess:programming:lsb_least_significant_bit [2021/10/30 11:57] – peter
+++ chess:programming:lsb_least_significant_bit [2021/10/30 13:11] (current) – peter
@@ Line 19: / Line 19: @@
 ----
-===== Using bit-wise operations =====
+===== Using Bit-wise operations =====
 <code cpp>
@@ Line 49: / Line 49: @@
 ----
+===== Using Builtin =====
+GCC has **<nowiki>__builtin_clz</nowiki>**.
+<code cpp>
+lsb = __builtin_clz(pos);
+</code>
+----
 ===== Using de Bruijn =====
@@ Line 83: / Line 95: @@
 </WRAP>
 ----
 ===== Using Logs =====
@@ Line 176: / Line 188: @@
 ===== References =====
-https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64?redirectedfrom=MSDN&view=msvc-160
 http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogDeBruijn
@@ Line 184: / Line 194: @@
 https://en.wikipedia.org/wiki/Bit_numbering
+https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64?redirectedfrom=MSDN&view=msvc-160