RFR: 8328181: C2: assert(MaxVectorSize >= 32) failed: vector length should be >= 32

[Vladimir Kozlov]

On Sun, 24 Mar 2024 09:58:59 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> This bug fix patch tightens the predication check for small constant length clear array pattern and relaxes associated feature checks. Modified few comments for clarity.
> 
> Kindly review and approve.
> 
> Best Regards,
> Jatin

src/hotspot/cpu/x86/x86.ad line 1755:

> 1753:     case Op_ClearArray:
> 1754:       if ((size_in_bits != 512) && !VM_Version::supports_avx512vl()) {
> 1755:         return false;

Please add comment to clarify condition. I am reading it as ClearArray will not be supported for NOT avx512 because we can have vector length 512 bits for not avx512.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18464#discussion_r1539707965