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Re: patch to omit the frame pointer from leaf functions
- To: john at feith dot com (John Wehle)
- Subject: Re: patch to omit the frame pointer from leaf functions
- From: Joern Rennecke <amylaar at cygnus dot co dot uk>
- Date: Mon, 21 Sep 1998 18:38:18 +0100
- Cc: egcs-patches at cygnus dot com
- Newsgroups: cygnus.egcs.patches
In article <199809210612.CAA04693.cygnus.egcs.patches@jwlab.FEITH.COM> you wrote:
: This change allows gcc to omit the frame pointer when optimizing
: leaf functions which don't call alloca. Are the situations where
: having a frame pointer in a leaf function is a win (assuming that
: the machine description doesn't require it)?
Yes. Without a fame pointer, debugging is usually impossible.
On those targets where it is possible, you can set CAN_DEBUG_WITHOUT_FP and
gcc will default to -fomit-frame-pointer when optimizing.