Enable reciprocal math

sxs-collaboration · Feb 3, 2023 · 780cb26 · 780cb26
1 parent 901ba22
commit 780cb26
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/cmake/SetupCxxFlags.cmake b/cmake/SetupCxxFlags.cmake
@@ -81,6 +81,15 @@ set_property(TARGET SpectreFlags
   $<$<COMPILE_LANGUAGE:CXX>:-ffp-contract=on>
   $<$<COMPILE_LANGUAGE:Fortran>:-ffp-contract=on>)
 
+# Allow the compiler to transform divisions into multiplication by the
+# reciprocal.
+set_property(TARGET SpectreFlags
+  APPEND PROPERTY
+  INTERFACE_COMPILE_OPTIONS
+  $<$<COMPILE_LANGUAGE:C>:-freciprocal-math>
+  $<$<COMPILE_LANGUAGE:CXX>:-freciprocal-math>
+  $<$<COMPILE_LANGUAGE:Fortran>:-freciprocal-math>)
+
 # By default, the LLVM optimizer assumes floating point exceptions are ignored.
 create_cxx_flag_target("-ffp-exception-behavior=maytrap" SpectreFpExceptions)
 target_link_libraries(