https://bugs.kde.org/show_bug.cgi?id=498492

--- Comment #1 from Paul Floyd <pjfl...@wanadoo.fr> ---
objdump -d:

0000000000201750 <do_lzcnt64>:
  201750: 55                            pushq   %rbp
  201751: 48 89 e5                      movq    %rsp, %rbp
  201754: 48 89 7d f8                   movq    %rdi, -0x8(%rbp)
  201758: 48 89 75 f0                   movq    %rsi, -0x10(%rbp)
  20175c: 48 89 55 e8                   movq    %rdx, -0x18(%rbp)
  201760: 48 8b 45 e8                   movq    -0x18(%rbp), %rax
  201764: 48 89 45 d0                   movq    %rax, -0x30(%rbp)
  201768: 48 c7 45 d8 00 00 00 00       movq    $0x0, -0x28(%rbp)
  201770: 48 c7 45 e0 00 00 00 00       movq    $0x0, -0x20(%rbp)
  201778: 48 8d 45 d0                   leaq    -0x30(%rbp), %rax
  20177c: 49 bb 55 55 55 55 55 55 55 55 movabsq $0x5555555555555555, %r11 # imm
= 0x5555555555555555
  201786: f3 4c 0f bd 18                lzcntq  (%rax), %r11
  20178b: 4c 89 58 08                   movq    %r11, 0x8(%rax)
  20178f: 9c                            pushfq
  201790: 41 5b                         popq    %r11
  201792: 4c 89 58 10                   movq    %r11, 0x10(%rax)
  201796: 48 8b 4d d8                   movq    -0x28(%rbp), %rcx
  20179a: 48 8b 45 f0                   movq    -0x10(%rbp), %rax
  20179e: 48 89 08                      movq    %rcx, (%rax)
  2017a1: 48 8b 45 e0                   movq    -0x20(%rbp), %rax
  2017a5: 48 25 d5 08 00 00             andq    $0x8d5, %rax            # imm =
0x8D5
  2017ab: 89 c1                         movl    %eax, %ecx
  2017ad: 48 8b 45 f8                   movq    -0x8(%rbp), %rax
  2017b1: 89 08                         movl    %ecx, (%rax)
  2017b3: 5d                            popq    %rbp
  2017b4: c3                            retq

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