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Re: Failure to apply trivial peephole optimizations
- From: Richard Henderson <rth at redhat dot com>
- To: Martin Buchholz <martin at xemacs dot org>
- Cc: gcc at gcc dot gnu dot org
- Date: Mon, 16 Dec 2002 20:22:52 +0000
- Subject: Re: Failure to apply trivial peephole optimizations
- References: <15866.64759.42776.797448@wobble.local>
On Sat, Dec 14, 2002 at 01:42:15AM -0800, Martin Buchholz wrote:
> A trivial peephole optimizer with a two instruction window can convert
> the sequence
>
> subl $40, %esp
> movl %ebp, %esp
> to
> movl %ebp, %esp
Peephole optimization is not the issue. Policy with regards to
stack frame manipulation is. What we want to do is enable
something akin to -momit-leaf-frame-pointer by default, but at
present this causes regressions in the gdb testsuite, so we can't.
r~