RFR: 8262355: Support for AVX-512 opmask register allocation. [v8]
Jatin Bhateja
jbhateja at openjdk.java.net
Wed Mar 17 13:14:10 UTC 2021
On Tue, 16 Mar 2021 12:55:53 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:
>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>>
>> 8262355: Removing object re-materialization handling for mask-generating nodes during de-opt, it will be added separately.
>
> src/hotspot/share/opto/chaitin.cpp line 922:
>
>> 920: break;
>> 921: case Op_RegVMask:
>> 922: lrg.set_num_regs(RegMask::SlotsPerRegVMask);
>
> Add `assert(Matcher::has_predicated_vectors(), "...")` here?
This will interfere with non-AVX512 targets, since some of instruction patterns have kReg temporary operands which will still be allocated but not JITed.
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PR: https://git.openjdk.java.net/jdk/pull/2768
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