[PATCH, Darwin, PowerPC, testsuite] Exclude Darwin from VSX, Power8 and Power9 tests.

[Segher Boessenkool]

Hi Iain,

On Wed, May 15, 2019 at 12:54:03PM +0100, Iain Sandoe wrote:
> If we build Darwin with a modern assembler, then it might well
> recognise insns that cannot be used on current Darwin systems.
> 
> The patch augments the tests for feature support for VSX, 
> power8 and power9 to exclude Darwin even if the assembler can
> handle the instructions.

Cannot be used, in what way?  *_ok test only if we can *compile* for
some subtarget.  What blows up?

The current tests aren't great, we should compile some actual code to
test if the compiler allows building for p8 for example -- more than
just the assembler.  Maybe it is enough to have some register input
that requires VSX registers on the asm in the test, for example.


Segher