[11] RFR: 8145665: Make UseSSE an x86 specific option and cleanup its usage in shared code

[Andrew Haley]

On 04/05/2018 09:04 PM, White, Derek wrote:

> This code looks good to me, but I think we need to update the
> aarch64 code to set RoundFPResults to false (like all other non-x64
> ports).  The AARCH64 port has [RoundFPResults=true; UseSSE=99],
> which worked ok until now. I sent question out to aarch64-port-dev
> to verify this.

We turned on UseSSE because in the old JVM there was code in the
shared part of C2 which was only enabled with UseSSE, and AArch64
vectorization didn't work unless UseSSE was enabled.  I believe this
bug is fixed.

We turned on RoundFPResults by mistake.  We could turn it off, but
we'd have to do some testing because C1 code generation would be
different even though in theory it should work the same.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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