[cfe-commits] [PATCH] Add -fexcess-precision option.

[Stephen Canon]

On Jun 21, 2012, at 2:28 PM, Lang Hames <lhames at gmail.com> wrote:

> Should this flag, whatever it's eventually called, have a "never-form" mode that over-rides FP_CONTRACT and prevents any FMA formation? That seems like it could be useful, if only for debugging. FP_CONTRACT doesn't guarantee any fusing, so a flag that disabled any fusing wouldn't violate FP_CONTRACT semantics, it would just provide a baseline with no fusing carried out. This is what I had in mind when I penned the comments that you referred to Hal.
> 
> In that case an alternative flag could be:
> 
> "-fform-fma={anywhere,standard,never}"

Sounds good to me.