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Re: [MIPS] MADD issue

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: "Fu, Chao-Ying" <fu at mips dot com>
Cc: Richard Sandiford <richard at codesourcery dot com>, GCC Development <gcc at gcc dot gnu dot org>
Date: Fri, 13 Apr 2007 13:12:25 +0200
Subject: Re: [MIPS] MADD issue
References: <3CB54817FDF733459B230DD27C690CEC03EE8E3F@Exchange.mips.com>
Reply-to: bonzini at gnu dot org

(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

Follow-Ups:
- Re: [MIPS] MADD issue
  - From: Ian Lance Taylor

References:
- [MIPS] MADD issue
  - From: Fu, Chao-Ying

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