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Re: [Bug tree-optimization/21380] [4.0 Regression] ICE compilingwith -O

From: Jeffrey A Law <law at redhat dot com>
To: gcc-patches at gcc dot gnu dot org, gcc-bugzilla at gcc dot gnu dot org
Cc: law at gcc dot gnu dot org
Date: Thu, 05 May 2005 21:01:23 -0600
Subject: Re: [Bug tree-optimization/21380] [4.0 Regression] ICE compilingwith -O
References: <20050504143056.21380.trt@acm.org> <20050504145608.26783.qmail@sourceware.org>
Reply-to: law at redhat dot com

Basically we have a block which is marked as having threadable
edges.  However, due to other threading opportunities the block
in question has become unreachable.  We still attempt to thread
the (non-existent) incoming edges, leading to the segfault.

The fix is trivial.  If a block has become unreachable, there's
no sense in trying to thread through it.

Attached is the patch for the GCC 4.0 branch which has been bootstrapped
and regression tested on i686-pc-linux-gnu.  I'll be testing the same
patch for mainline overnight.

Attachment: PPP
Description: Text document

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