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Re: Puzzling behaviour of `isnan' with -ffast-math

From: Lionel B
Subject: Re: Puzzling behaviour of `isnan' with -ffast-math
Date: Thu, 3 Jul 2008 15:21:35 +0000 (UTC)
User-agent: Pan/0.132 (Waxed in Black)

On Thu, 03 Jul 2008 15:18:38 +0200, Bernd Strieder wrote:

> Hello,
> Lionel B wrote:
>> Is this just because all bets are off with -ffast-math (i.e. undefined
>> behaviour) or is there a problem here?
> See the docs (info pages):
> `-ffinite-math-only'
>      Allow optimizations for floating-point arithmetic that assume that
>      arguments and results are not NaNs or +-Infs.
> `-ffast-math'
>      Sets `-fno-math-errno', `-funsafe-math-optimizations',
>      `-ffinite-math-only', `-fno-rounding-math', `-fno-signaling-nans'
>      and `-fcx-limited-range'.

Right, should have RTFM.


Lionel B

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