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Re: soft-fp: split FP_INIT_EXCEPTIONS from FP_INIT_ROUNDMODE
- From: David Miller <davem at davemloft dot net>
- To: joseph at codesourcery dot com
- Cc: libc-alpha at sourceware dot org
- Date: Thu, 10 Oct 2013 00:03:55 -0400 (EDT)
- Subject: Re: soft-fp: split FP_INIT_EXCEPTIONS from FP_INIT_ROUNDMODE
- Authentication-results: sourceware.org; auth=none
- References: <Pine dot LNX dot 4 dot 64 dot 1310092203430 dot 12619 at digraph dot polyomino dot org dot uk>
From: "Joseph S. Myers" <firstname.lastname@example.org>
Date: Wed, 9 Oct 2013 22:04:42 +0000
> Some soft-fp functions only need exception handling and not rounding,
> because their results are always exact (but signaling NaNs, if nothing
> else, may still result in exceptions) or do not depend on the rounding
> mode (e.g. comparisons and conversions to integers). For these, it's
> misleading to use FP_INIT_ROUNDMODE; on architectures where the state
> in question is only used for rounding and not for exceptions, it's
> also suboptimal. Thus, this patch defines a separate macro
> FP_INIT_EXCEPTIONS, defaulting to FP_INIT_ROUNDMODE, and uses it in
> the floating-point extensions that are the existing uses of
> FP_INIT_ROUNDMODE that can change.
This looks fine to me.