Integrated: 8358592: Assert in Assembler::ptest due to missing SSE42 support

[Guanqiang Han]

On Mon, 7 Jul 2025 02:52:10 GMT, Guanqiang Han <duke at openjdk.org> wrote:

> Setting "-XX:UseSSE=1" in command line prevents the code from entering the block shown below, which causes UseSSE42Intrinsics to not be correctly set. Because supports_sse3() return false.
> ![图片1](https://github.com/user-attachments/assets/d3cdb1fe-f0e0-41dc-98c9-4427eaffdb0e)
> in addition , setting "-XX:+UseSSE42Intrinsics" in command line set UseVectorizedMismatchIntrinsic to True shown below.
> ![图片2](https://github.com/user-attachments/assets/bbe623a3-453a-483d-b34c-1cdb394f2d4e)
> The above code causes the ptest instruction to be invoked.
> The assertion "assert(VM_Version::supports_sse4_1() || VM_Version::supports_avx(), "")" in ptest was triggered and caused the crash because of the following reason:
> Setting "-XX:UseSSE=1" in command line  cause "CPU_SSE4_1" was cleared and cause "VM_Version::supports_sse4_1()" return false ,related code as below:
> ![图片3](https://github.com/user-attachments/assets/e9a8a690-dd4d-4216-b09f-be8439a9a73b)
> Setting "-XX:UseSSE=1" in command line  cause "UseAVX=0" and cause "VM_Version::supports_avx()" return false ,related code as below:
> ![image](https://github.com/user-attachments/assets/6d9e770b-0a7a-43cd-a4bc-d15247f6478e)
> all of these above cause this issue.
> i fix this issue by correcting UseSSE42Intrinsics to false when "UseSSE" in command line was set to 1, so that UseVectorizedMismatchIntrinsic will be set false and ptest was not triggered.

This pull request has now been integrated.

Changeset: e1b2229b
Author:    Guanqiang Han <yongheng_hgq at 126.com>
Committer: SendaoYan <syan at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/e1b2229b0b1fe8560fcb1d6fc2cf01d69ed711ac
Stats:     79 lines in 2 files changed: 48 ins; 30 del; 1 mod

8358592: Assert in Assembler::ptest due to missing SSE42 support

Reviewed-by: kvn

-------------

PR: https://git.openjdk.org/jdk/pull/26151