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  • Hash : cb88e5da
    Author : mayeut
    Date : 2016-09-20T21:06:24

    ARM64 NEON: Fix another ABI conformance issue
    
    Based on
    https://github.com/mayeut/libjpeg-turbo/commit/98a5a9dc899aa9265858a3cbe0a96289a31a1322
    with wordsmithing by DRC.
    
    In the AArch64 ABI, as in many others, it's forbidden to read/store data
    below the stack pointer.  Some SIMD functions were doing just that
    (stack pointer misuse) when trying to preserve callee-saved registers,
    and this resulted in those registers being restored with incorrect
    contents under certain circumstances.
    
    This patch fixes that behavior, and callee-saved registers are now
    stored above the stack pointer throughout the function call.  The patch
    also removes register saving in places where it is unnecessary for this
    ABI, or it makes use of unused scratch regiters instead of callee-saved
    registers.
    
    Fixes #97.  Closes #101.
    
    Refer also to https://bugzilla.redhat.com/show_bug.cgi?id=1368569
    

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