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Re: Conditional clobbering

From: Paulo Matos <pocmatos at gmail dot com>
To: Joern Rennecke <joern dot rennecke at embecosm dot com>
Cc: gcc at gcc dot gnu dot org
Date: Tue, 23 Feb 2010 20:16:10 +0000
Subject: Re: Conditional clobbering
References: <11b141711002230524y430292q1b24ecd20b2380a4@mail.gmail.com> <20100223141229.br7gdwcyg4cs8g8s-nzlynne@webmail.spamcop.net>

On 02/23/10 19:12, Joern Rennecke wrote:
> Quoting "Paulo J. Matos" <pocmatos@gmail.com>:
>> I have a situation in writing a specific condition on an md file.
>> I have an insn with 2 alternatives and then I use which_alternative to
>> generate the assembler code but if which_alternative == 1 I am
>> clobbering a register. How can I tell gcc that if it matches 1, a
>> given register is clobbered?
> 
> You use a clobber with a matching constraint for alternative 1 and X for
> other alternatives.  Make sure the patten is not named.

Thanks!

-- 
PMatos

References:
- Conditional clobbering
  - From: Paulo J. Matos
- Re: Conditional clobbering
  - From: Joern Rennecke

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