# New Ticket Created by Chip Salzenberg # Please include the string: [perl #40804] # in the subject line of all future correspondence about this issue. # <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=40804 >
I just helped Matt diagnose JIT failures on Intel Mac which seem to be the result of Mac system software requiring that the stack be at least 16-byte aligned at all times. I can tell this because when running with -j, Parrot ends up at an invalid instruction fault at this instruction in a Mac system library: movdqa %xmm0, 32(%esp) Note the "a" there: "Aligned". There is a "movdqu" instruction in the CPU, but the Mac library doesn't use it. Therefore it's important for the x86 JIT code on Mac to make sure that it either (1) maintain the stack 16-byte aligned, or (2) leave the stack unaligned inside the JIT code, but ensure that the stack is aligned at the point of calling out of the JIT code. -- Chip Salzenberg <[EMAIL PROTECTED]>
