MSP430 IAR C/C++ Compiler reference guide - Rice University

Descriptions of options--reduce_stack_usageSyntaxDescription--reduce_stack_usageUse this option to make the compiler minimize the use of stack space at the cost ofsomewhat larger and slower code.Project>Options>C/C++ Compiler>Code>Reduce stack usage--regvar_r4SyntaxDescription--regvar_R4Use this option to reserve the register R4 for use by global register variables, declaredwith the __regvar attribute. This can give more efficient code if used on frequentlyused variables.See also --lock_r4, page 154 and __regvar, page 196.Project>Options>C/C++ Compiler>Code>R4 utilization>__regvar variables--regvar_r5SyntaxDescription--regvar_R5Use this option to reserve the register R5 for use by global register variables, declaredwith the __regvar attribute. This can give more efficient code if used on frequentlyused variables.See also --lock_r5, page 154 and __regvar, page 196.Project>Options>C/C++ Compiler>Code>R5 utilization>__regvar variables--remarksSyntaxDescription--remarksThe least severe diagnostic messages are called remarks. A remark indicates a sourcecode construct that may cause strange behavior in the generated code. By default, thecompiler does not generate remarks. Use this option to make the compiler generateremarks.164MSP430 IAR C/C++ CompilerReference Guide