None.
Indicates that the given list of registers cannot be used during the compilation except as a stack pointer, frame pointer or in some other fixed role.
You should use this option in modules that are required to work with other modules that use global register variables or hand-written assembler code.
Not applicable.
-qreserved_reg is cumulative, for example, specifying -qreserved_reg=r14 and -qreserved_reg=r15 is equivalent to specifying -qreserved_reg=r14:r15.
Duplicate register names are ignored.
None.
xlc myprogram.c -qreserved_reg=r3:r4