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Re: [PATCH] fast Copysign for PPC, -flag_unsafe_math_optimizations only

From: Richard Henderson <rth at redhat dot com>
To: Roger Sayle <roger at eyesopen dot com>
Cc: gcc-patches at gcc dot gnu dot org, Andrew Pinskia <pinskia at physics dot uc dot edu>
Date: Sun, 30 Jan 2005 19:06:32 -0800
Subject: Re: [PATCH] fast Copysign for PPC, -flag_unsafe_math_optimizations only
References: <20050131013204.GB32084@redhat.com> <Pine.LNX.4.44.0501301657300.27484-100000@www.eyesopen.com>

On Sun, Jan 30, 2005 at 05:01:00PM -0700, Roger Sayle wrote:
> Except for in back-ends, which shouldn't need to check which of their
> floating point modes support signed zeros, in which case the usual
> HONOR_SIGNED_ZEROS test reduces to flag_unsafe_math_optimizations.

No.  Using the proper HONOR macro also documents what aspect
of flag_unsafe_math_optimizations is being relied on.


r~

References:
- Re: [PATCH] fast Copysign for PPC, -flag_unsafe_math_optimizations only
  - From: Richard Henderson
- Re: [PATCH] fast Copysign for PPC, -flag_unsafe_math_optimizationsonly
  - From: Roger Sayle

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