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Re: Expanding an ADDSI3 into 2 x ADDHI3 does not work

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: GCC Development <gcc at gcc dot gnu dot org>, mhauff at bigpond dot net dot au
Date: Wed, 15 Jun 2005 14:00:36 +0200
Subject: Re: Expanding an ADDSI3 into 2 x ADDHI3 does not work
References: <12211316.1118819765880.JavaMail.imail@web02sl>

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

References:
- Expanding an ADDSI3 into 2 x ADDHI3 does not work
  - From: mhauff at bigpond dot net dot au

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