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Re: Puzzling behaviour of `isnan' with -ffast-math
From: |
Bernd Strieder |
Subject: |
Re: Puzzling behaviour of `isnan' with -ffast-math |
Date: |
Thu, 03 Jul 2008 15:18:38 +0200 |
User-agent: |
KNode/0.10.4 |
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'.
Bernd Strieder