rjmccall added a comment.

In D80315#2059160 <https://reviews.llvm.org/D80315#2059160>, @michele.scandale 
wrote:

> In D80315#2058914 <https://reviews.llvm.org/D80315#2058914>, @rjmccall wrote:
>
> > In D80315#2058735 <https://reviews.llvm.org/D80315#2058735>, 
> > @michele.scandale wrote:
> >
> > > In D80315#2058549 <https://reviews.llvm.org/D80315#2058549>, @rjmccall 
> > > wrote:
> > >
> > > > The code cleanups all seems reasonable.  The actual changes in 
> > > > code-generation changes are because we were failing to set these 
> > > > reliably?
> > >
> > >
> > > Most of them yes.
> > >
> > > In the CUDA test we there is now `contract` because we honor the default 
> > > contraction mode that for CUDA is set to fast.
> >
> >
> > Right, and we weren't honoring that mode before?
>
>
> Not in the setup of base fast-math flags inside `CodeGenFunction`. However 
> when emitting code for expression with `FPOptions` stored in the AST nodes 
> then `contract` was set correctly.


Okay, that seems justifiable.

>>> In `clang/test/CodeGen/complex-math.c` I've added `-ffp-contract=fast` to 
>>> the command line option because `-ffast-math` at the CC1 level does not 
>>> change the default contraction mode.
>> 
>> Oh, I see, makes sense.  So there was inconsistent treatment of the options, 
>> where one thing observed it but others didn't, and that's been fixed now.
> 
> Do you think we should handle `-ffast-math` as `-cl-fast-relaxed-math`, i.e. 
> it implies the default contraction mode being "fast"?

I'm actually surprised it doesn't.  I can't imagine why someone enabling fast 
math would want contraction to be disabled.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D80315/new/

https://reviews.llvm.org/D80315



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