LTO

Author: mark9064

src/CMakeLists.txt

@@ -853,6 +853,10 @@ if (${CMAKE_BUILD_TYPE} STREQUAL "Debug")
   # add_definitions(-DMYNEWT_VAL_BLE_HS_LOG_LVL=0)
 endif()
 
+if (CMAKE_BUILD_TYPE MATCHES Release)
+    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+endif()
+
 add_subdirectory(displayapp/fonts)
 target_compile_options(infinitime_fonts PUBLIC
         ${COMMON_FLAGS}

src/FreeRTOS/port.c

@@ -73,6 +73,7 @@ void vPortStartFirstTask( void )
 #ifdef SOFTDEVICE_PRESENT
                     ::"i"(configKERNEL_INTERRUPT_PRIORITY  << (8 - configPRIO_BITS))
 #endif
+                    " .ltorg                \n"
                 );
 }
 
@@ -92,6 +93,7 @@ void vPortSVCHandler( void )
                     "   bx r14                          \n"
                     "                                   \n"
                     "   .align 2                        \n"
+                    "   .ltorg                          \n"
                 );
 }
 
@@ -122,7 +124,7 @@ void xPortPendSVHandler( void )
     "   msr basepri, r0                     \n"
     "   dsb                                 \n"
     "   isb                                 \n"
-    "   bl vTaskSwitchContext               \n"
+    "   bl _vTaskSwitchContext              \n"
     "   mov r0, #0                          \n"
     "   msr basepri, r0                     \n"
     "   ldmia sp!, {r3}                     \n"
@@ -143,6 +145,12 @@ void xPortPendSVHandler( void )
     "   bx r14                              \n"
     "                                       \n"
     "   .align 2                            \n"
+    "   .ltorg                              \n"
     ::"i"(configMAX_SYSCALL_INTERRUPT_PRIORITY  << (8 - configPRIO_BITS))
     );
 }
+
+// Need __attribute__((used)) to prevent LTO stripping, as used in ASM above
+void __attribute__((used)) _vTaskSwitchContext(void) {
+  vTaskSwitchContext();
+}

src/systemtask/SystemTask.cpp

@@ -87,7 +87,7 @@ SystemTask::SystemTask(Drivers::SpiMaster& spi,
 
 void SystemTask::Start() {
   systemTasksMsgQueue = xQueueCreate(10, 1);
-  if (pdPASS != xTaskCreate(SystemTask::Process, "MAIN", 350, this, 1, &taskHandle)) {
+  if (pdPASS != xTaskCreate(SystemTask::Process, "MAIN", 400, this, 1, &taskHandle)) {
     APP_ERROR_HANDLER(NRF_ERROR_NO_MEM);
   }
 }