On Tue, 14 Feb 2023 18:42:07 GMT, Justin King <jck...@openjdk.org> wrote:
>> Update MSVC CFlags to be more consistent with other compilers. Also disables >> RTTI in a simliar manner to GCC/Clang for the JVM. > > Justin King has updated the pull request incrementally with one additional > commit since the last revision: > > Reposition -Oy- > > Signed-off-by: Justin King <jck...@google.com> The main difference between `/O1` and `/O2`, besides speed vs. size, is that the latter adds `/Oi` which tells the compiler to try and inline intrinsics rather than making function calls. This can lead to improved speed. GCC/Clang do the same thing by treating certain functions like memcpy/memset/memmove and special. Additionally I added `/Oy-` which preserves frame pointers. This makes MSVC match the GCC/Clang configuration with pass `-fno-omit-frame-pointer`. Additionally we have disabled RTTI now by passing `/GR-`, this again matches GCC/Clang. The resulting size of the JVM binary drops by ~1MB. ------------- PR: https://git.openjdk.org/jdk/pull/12073
