[cfe-dev] -fdenormal-fp-math

[Hal Finkel via cfe-dev]

On 03/09/2017 03:06 PM, Evandro Menezes via cfe-dev wrote:
> Can you please clarify if -fdenormal-fp-math is implied by 
> -ffast-math?  If not, shouldn't it be?

Why should it be?

>   Does the start-up code, if any, perhaps in compiler-rt, enable the 
> appropriate bits in the proper control register?  How can I help?

No. Right now, I believe that flag is taken as a statement about what 
the compiler can assume about the FP environment. It is not something we 
attempt to ensure at startup. I imagine we could on some systems (as you 
say, by using some startup code).

  -Hal

>
> Thank you,
>

-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory