• Martin Storsjö's avatar
    arm: Avoid using .dn register aliases · d7320ca3
    Martin Storsjö authored
    clang now (in the upcoming 5.0 version) is capable of building our
    arm assembly without relying on gas-preprocessor, although clang/LLVM
    doesn't support .dn register aliases.
    
    The VC1 MC assembly was only built and used if the chosen assembler
    supported the .dn directives though. This was supported as long as
    gas-preprocessor was used.
    
    This means that VC1 decoding got a speed regression on clang 5.0,
    unless the user manually chose using gas-preprocessor again.
    
    By avoiding using the .dn register aliases, we can build the VC1 MC
    assembly with the latest clang version.
    
    Support for the .dn/.qn directives in clang/LLVM isn't actively planned,
    see https://bugs.llvm.org/show_bug.cgi?id=18199.
    
    This partially reverts 896a5bff.
    Signed-off-by: 's avatarMartin Storsjö <martin@martin.st>
    d7320ca3
configure 167 KB