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Re: Porposal: Floating-Point Options
On Thu, 16 Jun 2005, Geoffrey Keating wrote:
> Although it does do some of this, -ffloat-store also has some rather nasty
> side-effects, because of what it is actually documented to do:
>
> > @item -ffloat-store
> > @opindex ffloat-store
> > Do not store floating point variables in registers, and inhibit other
> > options that might change whether a floating point value is taken from a
> > register or memory.
But is this actually a useful thing for users to be able to control, other
than for its effects in avoiding excess precision? If not - if the real
uses of it are for the same purpose as gcc.c-torture/execute/ieee/ieee.exp
uses it on x86, x86_64 -m32 and m68k, to avoid excess precision - then we
can just repurpose this option and make it a no-op on systems which
naturally don't need excess precision, and users using -ffloat-store right
now to avoid excess precision will find their code gets improved
correctness.
--
Joseph S. Myers http://www.srcf.ucam.org/~jsm28/gcc/
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