RFR: 8374516: -version asserts with "-XX:+UseAESCTRIntrinsics -XX:-UseAES": "need AES instructions and misaligned SSE support" in generate_counterMode_AESCrypt_Parallel()

[Guanqiang Han]

On Wed, 21 Jan 2026 08:32:59 GMT, Guanqiang Han <ghan at openjdk.org> wrote:

> Please review this change. Thanks!
> 
> **Description:**
> 
> VM crashes during startup on x86 when running with -XX:+UseAESCTRIntrinsics -XX:-UseAES. In this configuration, UseAESCTRIntrinsics may remain enabled while UseAES is explicitly disabled, and the VM generates AES-CTR stubs, hitting an assert(UseAES) in generate_counterMode_AESCrypt_Parallel().
> 
> **Fix:**
> 
> Update x86 flag initialization to enforce the dependency between UseAESCTRIntrinsics and UseAES. When UseAES is disabled, explicitly disable UseAESCTRIntrinsics (with a warning when it was set on the command line), aligning behavior with the existing UseAES/UseAESIntrinsics gating and avoiding stub generation with inconsistent flag states.
> 
> **Test:**
> 
> GHA

Hi @vnkozlov and @ascarpino , Sorry for the ping — could you please take a look at this PR when you have a moment?

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PR Comment: https://git.openjdk.org/jdk/pull/29338#issuecomment-3810647933