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More efficient implementation of opposite_halfedge handle

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Old code compiled to
   0x00000000004594a0 <+0>:    lea    -0x1(%rsi),%edx
   0x00000000004594a3 <+3>:    lea    0x1(%rsi),%eax
   0x00000000004594a6 <+6>:    and    $0x1,%esi
   0x00000000004594a9 <+9>:    cmovne %edx,%eax
   0x00000000004594ac <+12>:    retq

New code creates
   0x00000000004594a0 <+0>:    mov    %esi,%eax
   0x00000000004594a2 <+2>:    xor    $0x1,%eax
   0x00000000004594a5 <+5>:    retq

So no conditionals, jumps and fewer instructions

closes #5
This commit is contained in:
Jan Möbius
2015-10-23 10:25:47 +02:00
parent 6afadfbd4c
commit f5d2560656
1 changed files with 1 additions and 1 deletions
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2
src/OpenMesh/Core/Mesh/ArrayKernel.hh
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@@ -425,7 +425,7 @@ public:
HalfedgeHandle opposite_halfedge_handle(HalfedgeHandle _heh) const
{ return HalfedgeHandle((_heh.idx() & 1) ? _heh.idx()-1 : _heh.idx()+1); }
{ return HalfedgeHandle(_heh.idx() ^ 1); }
HalfedgeHandle ccw_rotated_halfedge_handle(HalfedgeHandle _heh) const