[jdk11u-dev] RFR: 8307572: AArch64: Vector registers are clobbered by some macroassemblers

[Andrew Haley]

On Mon, 10 Jul 2023 10:29:37 GMT, Ningsheng Jian <njian at openjdk.org> wrote:

> jdk11 also has the bug of JDK-8307572, so I propose to backport the fix to jdk11u. This is not a clean backport. Main changes:
> 
> 1) Definition of reg_class v4_reg..v7_reg, and operand vRegD_V4..vRegD_V7 are missing in jdk11u aarch64.ad, which was introduced in JDK-8214527. Added those definitions in this patch, as we need to claim them to be killed in match rules.
> 
> 2) JDK-8274243 (not a valid backport for 11u) changed MacroAssembler::encode_iso_array() a lot, but the bug of invalid use of v4/v5 still exists before and after that patch. Fixed the conflicts by using jdk11u naming convention.
> 
> No new jtreg test failure with both release and fastdebug build. Test case added in JDK-8307572 passes now, which fails without the backport.

Marked as reviewed by aph (Reviewer).

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PR Review: https://git.openjdk.org/jdk11u-dev/pull/2032#pullrequestreview-1523852250