https://bugs.kde.org/show_bug.cgi?id=409501

--- Comment #3 from Mark Wielaard <m...@klomp.org> ---
vpcomw is part of the AMD XOP instruction set:
https://en.wikipedia.org/wiki/XOP_instruction_set

gcc -march=bdver1 enables this instruction set (among others):

           bdver1
               CPUs based on AMD Family 15h cores with x86-64 instruction set
               support.  (This supersets FMA4, AVX, XOP, LWP, AES, PCL_MUL,
               CX16, MMX, SSE, SSE2, SSE3, SSE4A, SSSE3, SSE4.1, SSE4.2, ABM
               and 64-bit instruction set extensions.)

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