I have a GIMPLE_CALL statement and I want to mark the left-hand-side value as being addressable (mark_addressable()). I am trying to force the result to be stored on the stack, and not in a register. I know the return of a call on an 64bit x86 is passed back to the caller in the rax register. I want the return value to be immediately moved onto the stack from rax after the caller resumes execution. When I do mark the LHS of the call as being addressable, the ssa-expansion fails, as the updated node is not in the var_partition when get_rtx_for_ssa_name() is called. How can I tease the return of a caller to be stored on the stack, in a temporary variable, instead of lying around in a register, or being passed to other free registers?
-Matt
