[vectorIntrinsics+fp16] RFR: 8365967: C2 compiler support for HalffloatVector operations supported by auto-vectorization flow [v5]

[Jatin Bhateja]

> Hi All,
> 
> This patch extends VectorAPI inline expanders to infer Float16 vector IR based on the newly passed operType argument.
> We intend to leverage the existing IR and backend implementation of auto-vectorized Float16 operations. 
> Various HalffloatVector operators, namely ADD, SUB, MUL, DIV, MAX, MIN, and FMA, now emit FP16 ISA on x86 targets supporting AVX512-FP16 feature and AArch64 SVE targets.
> 
> Best Regards,
> Jatin

Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:

  Removing elemType from intrinsic interface, operType and carreirType are sufficient for inline expansion, fixed selectFromTwoVector fallback

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Changes:
  - all: https://git.openjdk.org/panama-vector/pull/231/files
  - new: https://git.openjdk.org/panama-vector/pull/231/files/0a258dbe..79962887

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=panama-vector&pr=231&range=04
 - incr: https://webrevs.openjdk.org/?repo=panama-vector&pr=231&range=03-04

  Stats: 1369 lines in 87 files changed: 149 ins; 25 del; 1195 mod
  Patch: https://git.openjdk.org/panama-vector/pull/231.diff
  Fetch: git fetch https://git.openjdk.org/panama-vector.git pull/231/head:pull/231

PR: https://git.openjdk.org/panama-vector/pull/231