RFR: 8368722: Vector API intrinsics enabled wrongly on platforms without support for misaligned vector access [v3]

[Fei Yang]

On Tue, 21 Oct 2025 13:30:57 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> > > Mind you that the following tests explicitly are testing `-XX:-AlignVector` and won't work on hardware platforms without misaligned vector. But it doesn't seem to me reasonable to add a requirement like `@requires vm.opt.EnableVectorSupport == true` for them as they are superword tests. These tests were once enabled for RISC-V by: https://bugs.openjdk.org/browse/JDK-8352529. Maybe we should simply keep them disabled for this platform?
> > 
> > 
> > Simply distable them on riscv seems not a good idea. Maybe add `@requires (os.arch != "riscv64" | !vm.opt.AlignVector))`?
> 
> These tests all report IR-related errors because the first commit did not handle `AlignVector`, only modifying `EnableVectorSupport`. This prevented the corresponding nodes from being printed. After implementing AlignVector handling, cases that fail to satisfy constraints are now skipped and no longer generate errors.

OK, that seems to work. I re-run these tests with your latest change and I see they are passing now. Thanks.

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PR Comment: https://git.openjdk.org/jdk/pull/27506#issuecomment-3430256233