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A question about arg pointer elimination

From: Kazu Hirata <kazu at cs dot umass dot edu>
To: gcc at gcc dot gnu dot org
Date: Sat, 26 Oct 2002 16:09:10 -0400 (EDT)
Subject: A question about arg pointer elimination

Hi,

I have a question about arg pointer elimination.  Let's say we have
three elimination rules defined in ELIMINABLE_REGS:

  ARG_POINTER   -> STACK_POINTER
  ARG_POINTER   -> FRAME_POINTER
  FRAME_POINTER -> STACK_POINTER

When -fomit-frame-pointer is on, does the following (cascading)
elimination happen?

  ARG_POINTER -> FRAME_POINTER -> STACK_POINTER

Or is it always the case that the elimination is direct like the
following?

  ARG_POINTER -> STACK_POINTER

Thanks,

Kazu Hirata

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