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Re: [Bug tree-optimization/24146] Optimizes away FPU control wordstore

From: Daniel Berlin <dberlin at dberlin dot org>
To: gcc-bugzilla at gcc dot gnu dot org
Cc: gcc-bugs at gcc dot gnu dot org
Date: Fri, 30 Sep 2005 10:05:53 -0400
Subject: Re: [Bug tree-optimization/24146] Optimizes away FPU control wordstore
References: <20050930134250.24146.rguenth@gcc.gnu.org> <20050930135810.2808.qmail@sourceware.org>

On Fri, 2005-09-30 at 13:58 +0000, rearnsha at gcc dot gnu dot org
wrote:
> ------- Additional Comments From rearnsha at gcc dot gnu dot org  2005-09-30 13:58 -------
> (In reply to comment #1)
> > volatile is needed here.
> 
> No, the manual says:
> An @code{asm} instruction without any output operands will be treated
> identically to a volatile @code{asm} instruction.
> 
> So this insn should be kept even though it isn't explicitly volatile.
> 

Then i guess we should teach the FE to just mark them volatile, so we
don't have to worry about this in the middle end.

References:
- [Bug tree-optimization/24146] New: Optimizes away FPU control word store
  - From: rguenth at gcc dot gnu dot org
- [Bug tree-optimization/24146] Optimizes away FPU control word store
  - From: rearnsha at gcc dot gnu dot org

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