Hi all,

Vector API fails to work when: - case 1: MaxVectorSize is set to <=8, or - case 2: C2 is disabled

The reason is that {max/preferred} VectorShape initialization fails in both cases. And the root cause is that VectorSupport_GetMaxLaneCount [1] returns unreasonable values (0 for case 1 and -1 for case 2).

Vector API should not depend on C2 to run. It should work even there is no JIT compiler since it's a Java-level api. So let's fix it.

Testing: - jdk/incubator/vector with -XX:MaxVectorSize=default/8 on Linux/x64

Thanks. Best regards, Jie

[1] https://github.com/openjdk/jdk/blob/master/src/hotspot/share/prims/vectorSup...

Jie Fu has updated the pull request incrementally with one additional commit since the last revision: Add VectorShape.getMaxVectorBitSize ------------- Changes: - all: https://git.openjdk.java.net/jdk/pull/2722/files - new: https://git.openjdk.java.net/jdk/pull/2722/files/79402411..d3b4cc35 Webrevs: - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2722&range=06 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2722&range=05-06 Stats: 26 lines in 1 file changed: 16 ins; 6 del; 4 mod Patch: https://git.openjdk.java.net/jdk/pull/2722.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/2722/head:pull/2722 PR: https://git.openjdk.java.net/jdk/pull/2722