RFR (S) 8037226: compiler/7196199/Test7196199.java fails on 32-bit linux with MaxVectorSize > 16

[Vladimir Kozlov]

I updated changes to include more ymm registers to test and print them 
in debug VM.

http://cr.openjdk.java.net/~kvn/8037226/webrev.01/

Thanks,
Vladimir

On 3/13/14 11:11 PM, Vladimir Kozlov wrote:
> WARNING: it is ugly but I don't know an other way to fix the problem and
> keep wide AVX vectors.
>
> Some operating systems (or VMs) does not restore upper 128 bit of AVX
> registers YMM after signal processing. About year ago Mac OS had this
> problem (8003878). And now we found 32-bit Ubuntu (Linux 3.8.0-29) which
> has the same problem.
>
> Instead of reducing vectorization to 16 bytes (XMM registers) I added
> code which verifies YMM state after signal processing and set limit on
> vector's size. The code is part of cpuid info code which JVM executes
> during startup.
>
> https://bugs.openjdk.java.net/browse/JDK-8037226
> http://cr.openjdk.java.net/~kvn/8037226/webrev/
>
> Tested on failing machines.
>
> thanks,
> Vladimir