RFR: 8329077: C2 SuperWord: Add MoveD2L, MoveL2D, MoveF2I, MoveI2F [v3]

[Galder Zamarreño]

On Wed, 20 Aug 2025 06:52:47 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Galder Zamarreño has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Check at the very least that auto vectorization is supported
>
> Had a quick look again and found a few more suggestions in the tests/benchmarks.
> But I think the VM changes are solid :)

@eme64 I've refactored the benchmarks to `TypeVectorOperations`. These are the before/after throughput numbers on darwin/aarch64:


Benchmark                                                             (COUNT)  (seed)   Mode  Cnt       Base      Patch   Units   Diff
TypeVectorOperations.TypeVectorOperationsSuperWord.convertD2LBits         512       0  thrpt    8   4993.941   5127.876  ops/ms    +3%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertD2LBits        2048       0  thrpt    8   1169.952   1179.016  ops/ms    +1%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertD2LBitsRaw      512       0  thrpt    8  15394.034  27658.958  ops/ms   +80%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertD2LBitsRaw     2048       0  thrpt    8   4007.795   7347.348  ops/ms   +83%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertF2IBits         512       0  thrpt    8   5140.632   5214.131  ops/ms    +1%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertF2IBits        2048       0  thrpt    8   1187.033   1130.995  ops/ms    -5%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertF2IBitsRaw      512       0  thrpt    8  15874.272  54196.086  ops/ms  +241%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertF2IBitsRaw     2048       0  thrpt    8   4020.074  15020.595  ops/ms  +274%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertIBits2F         512       0  thrpt    8  12008.101  53389.533  ops/ms  +345%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertIBits2F        2048       0  thrpt    8   3010.701  15001.785  ops/ms  +398%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertLBits2D         512       0  thrpt    8  11947.581  28216.125  ops/ms  +136%
TypeVectorOperations.TypeVectorOperationsSuperWord.convertLBits2D        2048       0  thrpt    8   2992.392   7354.876  ops/ms  +146%


I've added added more positive IR node checks to `TestCompatibleUseDefTypeSize`.

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PR Comment: https://git.openjdk.org/jdk/pull/26457#issuecomment-3214062842