RFR: 8374516: -version asserts with "-XX:+UseAESCTRIntrinsics -XX:-UseAES": "need AES instructions and misaligned SSE support" in generate_counterMode_AESCrypt_Parallel() [v2]

[Vladimir Kozlov]

On Tue, 3 Feb 2026 12:04:50 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
>
> Guanqiang Han has updated the pull request incrementally with one additional commit since the last revision:
> 
>   optimize warning log

Hi @hgqxjj 

The fix is fine but not complete. There are more issues down in code.
The main is that `FLAG_SET_DEFAULT()` is called under `!FLAG_IS_DEFAULT(UseAESCTRIntrinsics)) ` check which should be used only for `warning()` message.

See lines 1162 and 1180-1192.

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PR Review: https://git.openjdk.org/jdk/pull/29338#pullrequestreview-3747073765