* Re: [PATCH] PR 16373: -fomit-frame-pointer when optimizing on x86 (fwd)
@ 2004-07-12 3:01 Chris Lattner
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From: Chris Lattner @ 2004-07-12 3:01 UTC (permalink / raw)
To: gcc-patches
Right, I forgot to cc gcc-patches.
-Chris
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---------- Forwarded message ----------
Date: Sun, 11 Jul 2004 19:35:54 -0500 (CDT)
From: Chris Lattner <sabre@nondot.org>
To: Roger Sayle <roger@eyesopen.com>
Cc: Joseph S. Myers <jsm@polyomino.org.uk>
Subject: Re: [PATCH] PR 16373: -fomit-frame-pointer when optimizing on x86
Roger Sayle wrote:
> Do you have any doubt at all that this patch won't improve run-time,
> reduce code size and speed up a bootstrapped compiler? :>
Yes. It's quite likely to substantially increase code size. Almost every
reference to the stack will have to be relative to the ESP register.
References like [ESP+10] are substantially larger than the
equivalent [EBP-10] encoding because the SIB encoding must be used.
Food for thought,
-Chris
--
http://llvm.org/
http://nondot.org/sabre/
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2004-07-12 3:01 [PATCH] PR 16373: -fomit-frame-pointer when optimizing on x86 (fwd) Chris Lattner
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