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Re: [PATCH] Fix PR39715 (Thumb pessimization)

From: Paolo Bonzini <bonzini at gnu dot org>
To: Richard Earnshaw <rearnsha at arm dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 28 Oct 2009 17:44:22 +0100
Subject: Re: [PATCH] Fix PR39715 (Thumb pessimization)
References: <1249161859-12993-2-git-send-email-bonzini@gnu.org> <1249303275.21232.11.camel@e200601-lin.cambridge.arm.com>

On 08/03/2009 02:41 PM, Richard Earnshaw wrote:

>  	* simplify-rtx.c (simplify_relational_operation_1):
>  	Look for useless extensions of a subreg, if the extension
>  	is from the same mode as the subreg.


I'll punt on this bit following Adam's comments.  Please re-submit if
still needed.

Moving this to simplify_unary_operation_1 causes a libgfortran miscompilation on x86_64-linux.

However, something changed in the meanwhile and the testcase passes even without this bit. So I committed the patch without it.

Paolo

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