RFR(S): 8188857: [s390]: CPU feature detection incomplete
martin.doerr at sap.com
Mon Oct 9 09:38:36 UTC 2017
thanks for providing this fix. Looks good.
I’d only like to remove the assignment of used_len from vm_version_s390.cpp because it is neither used nor set to a defined value. I can remove it before pushing if you’re ok with that.
From: hotspot-compiler-dev [mailto:hotspot-compiler-dev-bounces at openjdk.java.net] On Behalf Of Schmidt, Lutz
Sent: Freitag, 6. Oktober 2017 17:37
To: hotspot-compiler-dev at openjdk.java.net
Subject: RFR(S): 8188857: [s390]: CPU feature detection incomplete
I would like to request reviews for this s390-only bug fix:
z/Architecture vector instructions require operating system support. Without os support, any attempt to execute such an instruction results in a SIGFPE signal. The presence of such support cannot be checked for by inspecting the cpu’s facility bits alone.
During startup, a vector instruction is attempted to execute and, in case of a SIGFPE, the vector facility is marked unavailable.
Dr. Lutz Schmidt | SAP JVM | PI SAP CP Core | T: +49 (6227) 7-42834
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