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	 Wed, 15 Jun 2005 13:57:06 +0200
Message-ID: <42B01864.8010807@lu.unisi.ch>
Date: Wed, 15 Jun 2005 11:59:00 -0000
From: Paolo Bonzini <paolo.bonzini@lu.unisi.ch>
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To: GCC Development <gcc@gcc.gnu.org>,  mhauff@bigpond.net.au
Subject: Re: Expanding an ADDSI3 into 2 x ADDHI3 does not work
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> If I use:
> (define_expand "addsi"

addsi3

>   "{
>   emit_insn (gen_addhi3 (custom_subword(operands[0], 0, SImode),
> 								 custom_subword(operands[1], 0, SImode),
> 								 custom_subword(operands[2], 0, SImode)));
> 	emit_insn (gen_addhi3 (custom_subword(operands[0], 1, SImode),
> 								 custom_subword(operands[1], 1, SImode),
> 								 custom_subword(operands[2], 1, SImode)));

How can this work?  You need something like an adchi3 pattern.

Paolo