[valgrind] [Bug 523843] New: Check stack alignment in doHelperCall

[email protected] Tue, 04 Aug 2026 08:58:30 +0000

Newsgroups	gmane.comp.kde.devel.bugs
Message-ID	<[email protected]/>

https://bugs.kde.org/show_bug.cgi?id=523843

            Bug ID: 523843
           Summary: Check stack alignment in doHelperCall
    Classification: Developer tools
           Product: valgrind
      Version First 3.27 GIT
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: memcheck
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Bug 523626 shows how the MOVDQA fails to work when Valgrind compiled with Clang
-O2 runs an x86 program.  The reason appears to be missing 16 byte stack
alignment needed by the SIMD instructions.

Bug 523626 handles one such specific case (none/tests/x86/sse4-x86).  This bug
is an attempt to find a generic solution to this problem.

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