kou commented on code in PR #50526:
URL: https://github.com/apache/arrow/pull/50526#discussion_r3642452023


##########
cpp/cmake_modules/SetupCxxFlags.cmake:
##########
@@ -49,7 +49,7 @@ endif()
 if(ARROW_CPU_FLAG STREQUAL "x86")
   # x86/amd64 compiler flags, msvc/gcc/clang
   if(MSVC)
-    set(ARROW_SSE4_2_FLAG "/arch:SSE4.2")
+    set(ARROW_SSE4_2_FLAG "")

Review Comment:
   OK. Could you add a comment why we don't need `/arch:SSE4.2` that is 
mentioned in the documented on both of x86 and x64?



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