Document how to enable PEXT with MSVC

When not using Makefile, e.g. with MSVC, if hardware
supports BMI2 instructions, then USE_PEXT should be
added in project configuration to enable pext support.

No functional change.

diff --git a/src/types.h b/src/types.h
index 367b4278d8b43cbf1fc289435fbf17fc88101e52..23e69d2ef03a8cec91e05c3ff64650d5d99b3bcf 100644 (file)
--- a/src/types.h
+++ b/src/types.h
@@ -33,6 +33,9 @@
 ///
 /// -DUSE_POPCNT  | Add runtime support for use of popcnt asm-instruction. Works
 ///               | only in 64-bit mode and requires hardware with popcnt support.
+///
+/// -DUSE_PEXT    | Add runtime support for use of pext asm-instruction. Works
+///               | only in 64-bit mode and requires hardware with pext support.
 
 #include <cassert>
 #include <cctype>