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Re: error compiling libgcc with ported cross-compiler

From: Jim Wilson <wilson at specifix dot com>
To: Tomas Svensson <idulus at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Mon, 10 Sep 2007 14:32:15 -0700
Subject: Re: error compiling libgcc with ported cross-compiler
References: <9850f5010709100054j1ed6d0caqb1c596ec7a4ddb18@mail.gmail.com>

Tomas Svensson wrote:

It seems that gcc has emitted rtl describing a memory reference (mem
(plus (mem (plus (reg ..) (const_int ..))) (const_int ..))), which
should not have been permitted by GO_IF_LEGITIMATE_ADDRESS since it
only allows (mem (plus (reg ..) (const ..))), and forbids a second
level of memory reference.

This is probably a REG_OK_STRICT bug. During reload, an unallocated pseudo-reg is actually a memory reference in disguise, so you must check for and reject pseudo-regs during reload. This is handled by the REG_OK_STRICT macro. Just look at any port to see how to handle this correctly.

Jim

References:
- error compiling libgcc with ported cross-compiler
  - From: Tomas Svensson

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