Bitbase index() from ADD to OR.

mstembera · glinscott · commit fe07ae4cb4c2 · 2014-11-26T07:56:48.000+08:00
No functional change. Resolves #132
diff --git a/src/bitbase.cpp b/src/bitbase.cpp
@@ -41,7 +41,7 @@ namespace {
   // bit 13-14: white pawn file (from FILE_A to FILE_D)
   // bit 15-17: white pawn RANK_7 - rank (from RANK_7 - RANK_7 to RANK_7 - RANK_2)
   unsigned index(Color us, Square bksq, Square wksq, Square psq) {
-    return wksq + (bksq << 6) + (us << 12) + (file_of(psq) << 13) + ((RANK_7 - rank_of(psq)) << 15);
+    return wksq | (bksq << 6) | (us << 12) | (file_of(psq) << 13) | ((RANK_7 - rank_of(psq)) << 15);
   }
 
   enum Result {

Original file line number	Diff line number	Diff line change
`@@ -41,7 +41,7 @@ namespace {`
`41`	`41`	`// bit 13-14: white pawn file (from FILE_A to FILE_D)`
`42`	`42`	`// bit 15-17: white pawn RANK_7 - rank (from RANK_7 - RANK_7 to RANK_7 - RANK_2)`
`43`	`43`	`unsigned index(Color us, Square bksq, Square wksq, Square psq) {`
`44`		`- return wksq + (bksq << 6) + (us << 12) + (file_of(psq) << 13) + ((RANK_7 - rank_of(psq)) << 15);`
	`44`	`+ return wksq \| (bksq << 6) \| (us << 12) \| (file_of(psq) << 13) \| ((RANK_7 - rank_of(psq)) << 15);`
`45`	`45`	`}`
`46`	`46`
`47`	`47`	`enum Result {`