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Re: tree to rtl conversion optimizations

From: Jim Wilson <wilson at specifixinc dot com>
To: Johnny Huynh <huynh at ugrad dot cs dot ualberta dot ca>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 19 May 2004 16:19:34 -0700
Subject: Re: tree to rtl conversion optimizations
References: <Pine.GSO.4.56.0405171149430.28559@csu210.cs.ualberta.ca>

Johnny Huynh wrote:

Sorry if this sounds like a simple question, but I'm not too good at
tracing through all the source yet. During the conversion from tree to
RTL, there seems to be an optimizing step that determines whether
operands should be placed (-O0) in memory and accessed via an offset, or
(-O2) simply placed in registers.

See the optimize test in expand_decl in stmt.c.

The compiler should still work fine if you disable this, so that all local variables end up in stack slots.

There might be other places in the code that are putting variables into pseudo regs. -- Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com

References:
- tree to rtl conversion optimizations
  - From: Johnny Huynh

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