On Nov 2, 2018, at 11:37 AM, Michael Meissner <meiss...@linux.ibm.com> wrote:
> 
> As I discussed in my 2018 Cauldron talk, the PowerPC GCC compiler supported a
> subset of the original design for fusion in the power9 hardware using 
> peepholes
> to fuse together ADDIS instructions and floating point load/store operations.
> 
> However, while fusion was part of the original power9 design, by the time the
> machine came out, the fusion support was no longer part of the architecture.
> 
> This patch removes all of the so-called power9 fusion support for the GCC
> compiler.  It leaves -mpower9-fusion as a deprecated switch

So, I'd just remove the flag support as well.  Anyone that hits on it, will 
want to examine their code and have the opportunity to fix it.

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