[Webkit-unassigned] [Bug 180653] New: LLInt: reserve 16 bytes of stack on MIPS for native calls

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180653

            Bug ID: 180653
           Summary: LLInt: reserve 16 bytes of stack on MIPS for native
                    calls
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: guijemont at igalia.com

The calling convention on MIPS is that the caller reserves 16 bytes (4 words) of stack space for all calls (regardless of the number of arguments). The callee can use that space. in LLInt's nativeCallTrampoline (which is only used if JIT is disabled), we effectively only save 8 bytes when adjusting the alignment. This crashes many date-related tests when running in llint-only mode when compiling in -Os.

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