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    SubjectRe: Memory corruption due to word sharing
    From: Michael Matz <>
    Date: Wed, 1 Feb 2012 18:41:05 +0100 (CET)

    > One problem is that it's not a new problem, GCC emitted similar code since
    > about forever, and still they turned up only now (well, probably because
    > ia64 is dead, but sparc64 should have similar problems).

    Indeed, on sparc64 it does do the silly 64-bit access too:

    ldx [%o0+8], %g2
    sethi %hi(2147483648), %g1
    or %g2, %g1, %g1
    jmp %o7+8
    stx %g1, [%o0+8]

    Personally I've avoided C bitfields like the plague in any code I've

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