RFR: 8350284: WebKit 620.1 crashes on startup on Windows x86 32-bit

[Kevin Rushforth]

On Tue, 8 Apr 2025 07:48:19 GMT, Roman Marchenko <rmarchenko at openjdk.org> wrote:

> All the crashes are on "`movaps`" instructions, like "`movaps xmmword ptr [esi+0x30], xmm0`".
> 
> "`movaps`" must operate with aligned addresses as 
>> When the source or destination operand is a memory operand, the operand must be aligned on a 16-byte boundary or a general-protection exception (#GP) is generated
> 
> written in docs. When crashes, ESI contains value like `0x27DB63A8`, so it doesn’t seem aligned to 16-byte boundary. The line "`siginfo: ExceptionCode=0xc0000005, reading address 0xffffffff`" from `hs_err` file implicitly says it is GP, not a real "reading address 0xffffffff".
> 
> It might be related to clang-cl bug, see https://github.com/llvm/llvm-project/issues/55844
> 
> The workaround is to disable SSE when building 32bit on Windows. (`-mno-sse`)

The change looks correct to me, but @jaybhaskar can say for sure.

I will run a test build (on JDK 8, since that is the only release on which we still have a 32-bit build) to confirm.

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PR Comment: https://git.openjdk.org/jfx/pull/1764#issuecomment-2786287755