TheSuperHackers @fix Disable FMA contraction for cross-platform deterministic math parity

Author: Okladnoj

cmake/compilers.cmake

@@ -51,6 +51,9 @@ if (NOT IS_VS6_BUILD)
         add_compile_options(/Zc:__cplusplus)
     else()
         add_compile_options(-Wsuggest-override)
+        # TheSuperHackers @fix Prevent FMA contraction (a*b+c -> fmadd) which skips intermediate
+        # rounding and breaks cross-platform deterministic math parity with MSVC (/fp:precise).
+        add_compile_options(-ffp-contract=off)
     endif()
 else()
     if(RTS_BUILD_OPTION_VC6_FULL_DEBUG)