On Fri, Feb 8, 2013 at 2:40 AM, Matt Davis <mattdav...@gmail.com> wrote: > 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?
It depends on where you are doing that transform. If during GIMPLE optimization then the only good way is to use a new volatile local decl. You can create that with create_tmp_var_raw () and set TREE_THIS_VOLATILE on it. Richard. > -Matt
