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[Bug libc/15723] setjmp trashes vmx regs when save buffer is misaligned


http://sourceware.org/bugzilla/show_bug.cgi?id=15723

--- Comment #4 from Alan Modra <amodra at gmail dot com> ---
Re comment #3.  See Altivec Technology Programming Interface Manual.  This
insists that the implementation permit a buffer only aligned to 4 bytes, to
allow the user to copy a jmp_buf to somewhere only 4 byte aligned.

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