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Re: Patch to avoid prefixes in ashlhi3 pattern
- To: Jan Hubicka <hubicka at atrey dot karlin dot mff dot cuni dot cz>
- Subject: Re: Patch to avoid prefixes in ashlhi3 pattern
- From: Jeffrey A Law <law at upchuck dot cygnus dot com>
- Date: Mon, 12 Apr 1999 19:53:48 -0600
- cc: egcs-patches at egcs dot cygnus dot com
- Reply-To: law at cygnus dot com
In message <19990412160159.28096@atrey.karlin.mff.cuni.cz>you write:
>
> Hi
> This patch adds some extra checking to ashlhi3 pattern to avoid emiting
> of prefixed opcode.
>
> Mon Apr 12 15:59:39 MET DST 1999 Jan Hubicka <hubicka@freesoft.cz>
>
> * i386.md (asilhi3): Do not emit prefixed opcode when possible.
>
[ ... ]
> if (REG_P (operands[0]) && operands[2] == const1_rtx)
> return AS2 (add%W0,%0,%0);
Seems to me you can also avoid a prefixed opcode here too. Is there some
reason you don't?
jeff