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Date: Fri, 13 Apr 2007 13:07:00 -0000
From: Paolo Bonzini <paolo.bonzini@lu.unisi.ch>
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To: "Fu, Chao-Ying" <fu@mips.com>
CC: Richard Sandiford <richard@codesourcery.com>,   GCC Development <gcc@gcc.gnu.org>
Subject: Re: [MIPS] MADD issue
References: <3CB54817FDF733459B230DD27C690CEC03EE8E3F@Exchange.mips.com>
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> (define_insn "adddi3_internal_1"
>   [(set (match_operand:DI 0 "register_operand" "=d,&d")
>         (plus:DI (match_operand:DI 1 "register_operand" "0,d")
>                  (match_operand:DI 2 "register_operand" "d,d")))
>    (clobber (match_operand:SI 3 "register_operand" "=d,d"))]
>   "!TARGET_64BIT && !TARGET_DEBUG_G_MODE && !TARGET_MIPS16"
> {
>   return (REGNO (operands[0]) == REGNO (operands[1])
>           && REGNO (operands[0]) == REGNO (operands[2]))
>     ? "srl\t%3,%L0,31\;sll\t%M0,%M0,1\;sll\t%L0,%L1,1\;addu\t%M0,%M0,%3"
>     : "addu\t%L0,%L1,%L2\;sltu\t%3,%L0,%L2\;addu\t%M0,%M1,%M2\;addu\t%M0,%M0,%3";
> }

This should be a post-reload (i.e. predicated on reload_completed) 
split, I think.

Paolo