Integrated: 8324874: AArch64: crypto pmull based CRC32/CRC32C intrinsics clobber V8-V15 registers

[Evgeny Astigeevich]

On Sun, 4 Feb 2024 20:19:40 GMT, Evgeny Astigeevich <eastigeevich at openjdk.org> wrote:

> [JDK-8302113](https://bugs.openjdk.org/browse/JDK-8302113) and [JDK-8302783](https://bugs.openjdk.org/browse/JDK-8302783) enhanced CRC32/CRC32C intrinsics with crypto pmull which is enabled for Neoverse V1 and V2. The intrinsics use `kernel_crc32_common_fold_using_crypto_pmull` which uses v8-v15 registers and potentially clobbers them if they are not saved before CRC32/CRC32C intrinsics are called.
> 
> According to the latest “ABI for the Arm 64-bit Architecture with SVE support”: https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst
> 
> 
> Registers v8-v15 must be preserved by a callee across subroutine calls;
> the remaining registers (v0-v7, v16-v31) do not need to be preserved
> (or should be preserved by the caller).
> 
> 
> This PR reallocates registers to avoid v8-v15 registers:
> - v0-v7 are used for data.
> - v16-v31 are tmp registers.
> 
> Regression tests are added.
> Tested a fastdebug build on Graviton 3:
> - `gtest`: Passed
> - `tier1..tier3`: Passed

This pull request has now been integrated.

Changeset: 4cd31875
Author:    Evgeny Astigeevich <eastigeevich at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/4cd318756d4a8de64d25fb6512ecba9a008edfa1
Stats:     254 lines in 2 files changed: 172 ins; 0 del; 82 mod

8324874: AArch64: crypto pmull based CRC32/CRC32C intrinsics clobber V8-V15 registers

Reviewed-by: aph, ngasson

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PR: https://git.openjdk.org/jdk/pull/17701