[vectorIntrinsics] RFR: 8264153: Add Insert integer nodes implementation for Arm SVE

[Ningsheng Jian]

On Mon, 29 Mar 2021 09:27:12 GMT, Wang Huang <whuang at openjdk.org> wrote:

> Add Insert integer nodes implementation for Arm SVE, such like VectorInsert(B/S/I/L) Node.
> * add `sve_index` & `sve_cpy`

src/hotspot/cpu/aarch64/aarch64_sve_ad.m4 line 1908:

> 1906:     __ sve_cmpeq(as_PRegister($pTmp$$reg), size, ptrue,
> 1907:                  as_FloatRegister($tmp$$reg), as_FloatRegister($tmp2$$reg));
> 1908:     // If register is the same, then move is not needed.

If src and dst are the same reg,

src/hotspot/cpu/aarch64/assembler_aarch64.hpp line 3540:

> 3538: // SVE INDEX (immediates)
> 3539:   void sve_index(FloatRegister Zd, SIMD_RegVariant T,
> 3540:             int16_t imm1, int16_t imm2) {

int instead of int16_t?
Style: Merge into one line, or fix the second line "int16_t imm1..." indentation.

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PR: https://git.openjdk.java.net/panama-vector/pull/54