8351152: x86: Remove code blocks that handle UseSSE < 2

[shipilev]

32-bit x86 was the platform that supported UseSSE < 2. 64-bit x86 baselines on UseSSE >= 2:

jdk/src/hotspot/cpu/x86/vm_version_x86.cpp

Lines 895 to 902 in 567c688

	#ifdef _LP64
	// OS should support SSE for x64 and hardware should support at least SSE2.
	if (!VM_Version::supports_sse2()) {
	vm_exit_during_initialization("Unknown x64 processor: SSE2 not supported");
	}
	// in 64 bit the use of SSE2 is the minimum
	if (UseSSE < 2) UseSSE = 2;
	#endif

After 32-bit x86 code is gone, we can remove all code blocks that are there to support UseSSE < 2.

Additional testing:

• Linux x86_64 server fastdebug, all

---

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Issue

• JDK-8351152: x86: Remove code blocks that handle UseSSE < 2 (Sub-task - P4)

Reviewers

• Vladimir Kozlov (@vnkozlov - Reviewer) Review applies to 7f505137
• Vladimir Ivanov (@iwanowww - Reviewer)

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[openjdk]

@shipilev This change now passes all automated pre-integration checks.

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After integration, the commit message for the final commit will be:

8351152: x86: Remove code blocks that handle UseSSE < 2

Reviewed-by: vlivanov, kvn

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At the time when this comment was updated there had been 21 new commits pushed to the master branch:

• 83c7d3b: 8351740: Clean up some code around initialization of encoding properties
• e35f67b: 8285888: Clarify that java.net.http.HttpClient do NOT support Digest authentication
• 7382ea1: 8354230: Wrong boot jdk for alpine-linux-x64 in GHA
• ... and 18 more: https://git.openjdk.org/jdk/compare/04e2a0621d80f23cf70b4649ec4c24dad28e8e2d...master

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[mlbridge]

Webrevs

• 02: Full (1e30d024)
• 01: Full - Incremental (7f505137)
• 00: Full (04f50944)

[vnkozlov]

Looks good.

[iwanowww]

Looks good.

[shipilev]

Thank you!

/integrate

[openjdk]

Going to push as commit cf0308b.
Since your change was applied there have been 26 commits pushed to the master branch:

• d8bed69: 8354317: [XWayland] Problem list two tests crashing XWayland server
• f955a8c: 8352687: Opensource few JInternalFrame and JTextField tests
• 4478a99: 8354057: Odd debug output in -Xlog:os+container=debug on certain systems
• ... and 23 more: https://git.openjdk.org/jdk/compare/04e2a0621d80f23cf70b4649ec4c24dad28e8e2d...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit cf0308b.

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