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Re: optimization/9052: in C code, "if" statement fails to execute if optimized
- From: Eric Botcazou <ebotcazou at libertysurf dot fr>
- To: Richard dot Earnshaw at arm dot com
- Cc: Steven Bosscher <s dot bosscher at student dot tudelft dot nl>,gcc-gnats at gcc dot gnu dot org,gcc-bugs at gcc dot gnu dot org,nobody at gcc dot gnu dot org,phama at webjockey dot net
- Date: Wed, 12 Feb 2003 17:55:22 +0100
- Subject: Re: optimization/9052: in C code, "if" statement fails to execute if optimized
- References: <200302121624.h1CGO9G31917@pc960.cambridge.arm.com>
> Adding -ffloat-store will probably also make the "misbehaviour" go away.
It does.
> GCC is almost certainly using the register result from the current
> iteration to compare with the memory result from an earlier iteration.
> Since the register result has excess precision the compare for equality
> fails. That's not a bug, it's just the FP works on the X86.
>
> So in summary, almost certainly "not a bug".
I fully concur. I think the PR can be closed.
--
Eric Botcazou