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35 # - Decide whether to use CPU cycle counters
37 # gmx_manage_cycle_counters()
39 # By default, we enable GMX_CYCLECOUNTERS for all architectures except ARMv7.
40 # On ARMv7, we enable it if we are not cross-compiling and can run a small
41 # test to confirm that the support is present in the kernel, otherwise we
44 macro(gmx_manage_cycle_counters)
46 if(NOT DEFINED GMX_CYCLECOUNTERS)
50 if(NOT CMAKE_CROSSCOMPILING)
52 try_run(ARMV7_COUNTER_RUN_VAR ARMV7_COUNTER_COMPILE_VAR
53 ${CMAKE_BINARY_DIR} "${CMAKE_SOURCE_DIR}/cmake/TestARMv7CycleCounters.cpp")
55 # Enable cycle counter usage if the test ran fine and exited with 0 return code
56 if(${ARMV7_COUNTER_COMPILE_VAR} AND ("${ARMV7_COUNTER_RUN_VAR}" EQUAL "0"))
57 set(GMX_CYCLECOUNTERS ON CACHE BOOL "Use CPU cycle counters timing")
59 set(GMX_CYCLECOUNTERS OFF CACHE BOOL "Use CPU cycle counters for timing")
64 # Disable cycle counters when cross-compiling for ARMv7
65 set(GMX_CYCLECOUNTERS OFF CACHE BOOL "Use CPU cycle counters for timing")
71 # For now we (try to) enable cycle counters on all other platforms
72 set(GMX_CYCLECOUNTERS ON CACHE BOOL "Use CPU cycle counters timing")
76 mark_as_advanced(GMX_CYCLECOUNTERS)