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Re: [PATCH] power: Fix VSCR position on ucontext
On Wed, 14 Nov 2018, Florian Weimer wrote:
>* Rogerio Alves:
>> +#ifdef _ARCH_PWR8
>Is it possible to perform run-time detection instead?
That's a fair point. Even though we have bots that test powerpc64
(big-endian) builds configured with `--with-cpu=power8', that's not the
default. Runtime detection could make this test work on default builds
(provided they are run on a POWER8 machine).
>+ /* Set SAT bit in VSCR register. */
>+ asm volatile ("vspltisb %0,0\n"
>+ "vspltisb %1,-1\n"
>+ "vpkudus %0,%0,%1\n"
Also, if you replace `vpkudus' (only available since Power ISA 2.07) with
`vpkuwus' (available since PowerISA 2.03) the test remains valid and it
could be tested on older machines.