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    • Diego Biurrun's avatar
      x86: build: replace mmx2 by mmxext · 239fdf1b
      Diego Biurrun authored
      Refactoring mmx2/mmxext YASM code with cpuflags will force renames.
      So switching to a consistent naming scheme beforehand is sensible.
      The name "mmxext" is more official and widespread and also the name
      of the CPU flag, as reported e.g. by the Linux kernel.
      239fdf1b
  22. 29 Jun, 2012 1 commit
    • Mans Rullgard's avatar
      x86: vc1: fix and enable optimised loop filter · f2fd1678
      Mans Rullgard authored
      The problem is that the ssse3 psign instruction does the wrong
      thing here.  Commit ea60dfe2 incorrectly removed a macro emulating
      this instruction for pre-ssse3 code.  However, the emulation is
      incorrect, and the code relies on the behaviour of the macro.
      Specifically, the psign sets destination elements to zero where
      the corresponding source element is zero, whereas the emulation
      only negates destination elements where the source is negative.
      
      Furthermore, the PSIGNW_MMX macro in x86util.asm is totally bogus,
      which is why the original VC-1 code had an additional right shift
      when using it.  Since the psign instruction cannot be used here,
      skip all the macro hell and use the working instruction sequence
      directly.
      
      None of this was noticed due a stray return statement in
      ff_vc1dsp_init_mmx() which meant that only the mmx version of the
      loop filter was ever used (before being removed in ea60dfe2).
      Signed-off-by: 's avatarMans Rullgard <mans@mansr.com>
      f2fd1678
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