Use the new PCMPESTRM instruction (Parallel CoMPare Explicit-length STRings with result in a Mask) which is added in SSE4.2 for facilitating string operations. The "compare ranges" mode allows us to search for characters outside the Latin 1 range and then use the SSE4.1 PBLENDVB instruction to replace those with question marks. Unlike previous SSE compare instructions, the PCMPxSTRx family allows us to operate on unsigned 16-bit values. This saves us another parallel add. Reviewed-By: Samuel Rødal (cherry picked from commit 45d2d36c9dbcbce403c78838ea52acd1ab111b68) Change-Id: I0f9d864f9d19c0f0da43ccb6918dc28295074496 Reviewed-on: http://codereview.qt-project.org/4468 Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com> Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com> Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com> |
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