minor nohalo1 speed clean up
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Nicolas Robidoux
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@ -1,8 +1,11 @@
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/* nohalo level 1 interpolator
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*
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* Hacked for vips by J. Cupitt, 20/1/09
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*
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* Tweaks by N. Robidoux and J. Cupitt 4-17/3/09
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*
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* Tweaks by N. Robidoux 25/5/09
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*
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* 16/3/09
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* - rename as nohalo1
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* - move "restrict" support to configure
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@ -39,9 +42,9 @@
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* 2009 (c) Nicolas Robidoux
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*
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* Nicolas thanks Geert Jordaens, John Cupitt, Minglun Gong, Øyvind
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* Kolås and Sven Neumann for useful comments and code.
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* Kolås, Ralf Meyer and Sven Neumann for useful comments and code.
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*
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* Nicolas Robidoux's research on nohalo funded in part by an NSERC
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* Nicolas Robidoux's research on Nohalo funded in part by an NSERC
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* (National Science and Engineering Research Council of Canada)
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* Discovery Grant.
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*/
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@ -356,7 +359,7 @@ nohalo1( const double uno_two,
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const double troi_thr = qua_thr - tre_thr;
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/*
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* Products and differences useful for minmod:
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* Products useful for minmod:
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*/
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const double deux_prem_dos = deux_dos * prem_dos;
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const double deux_deux_dos = deux_dos * deux_dos;
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@ -366,12 +369,6 @@ nohalo1( const double uno_two,
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const double deux_deux_two = deux_two * deux_two;
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const double deux_troi_two = deux_two * troi_two;
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const double deux_prem_minus_deux_deux_dos = deux_prem_dos - deux_deux_dos;
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const double deux_troi_minus_deux_deux_dos = deux_troi_dos - deux_deux_dos;
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const double deux_prem_minus_deux_deux_two = deux_prem_two - deux_deux_two;
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const double deux_troi_minus_deux_deux_two = deux_troi_two - deux_deux_two;
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const double deux_prem_tre = deux_tre * prem_tre;
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const double deux_deux_tre = deux_tre * deux_tre;
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const double deux_troi_tre = deux_tre * troi_tre;
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@ -380,6 +377,15 @@ nohalo1( const double uno_two,
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const double deux_deux_thr = deux_thr * deux_thr;
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const double deux_troi_thr = deux_thr * troi_thr;
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/*
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* Differences useful for minmod:
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*/
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const double deux_prem_minus_deux_deux_dos = deux_prem_dos - deux_deux_dos;
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const double deux_troi_minus_deux_deux_dos = deux_troi_dos - deux_deux_dos;
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const double deux_prem_minus_deux_deux_two = deux_prem_two - deux_deux_two;
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const double deux_troi_minus_deux_deux_two = deux_troi_two - deux_deux_two;
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const double deux_prem_minus_deux_deux_tre = deux_prem_tre - deux_deux_tre;
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const double deux_troi_minus_deux_deux_tre = deux_troi_tre - deux_deux_tre;
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@ -387,59 +393,60 @@ nohalo1( const double uno_two,
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const double deux_troi_minus_deux_deux_thr = deux_troi_thr - deux_deux_thr;
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/*
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* Useful sums:
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* Useful terms computer here to put "space" between the computation
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* of components of flag variables and their use:
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*/
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const double dos_two_plus_dos_thr = dos_two + dos_thr;
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const double dos_two_plus_tre_two = dos_two + tre_two;
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const double deux_thr_plus_deux_dos = deux_thr + deux_dos;
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const double twice_dos_two_plus_dos_thr = ( dos_two + dos_thr ) * 2.;
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const double twice_dos_two_plus_tre_two = ( dos_two + tre_two ) * 2.;
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const double twice_deux_thr_plus_deux_dos = ( deux_thr + deux_dos ) * 2.;
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/*
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* Compute the needed "right" (at the boundary between one input
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* pixel areas) double resolution pixel value:
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*/
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const double four_times_dos_twothr =
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twice_dos_two_plus_dos_thr
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+
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FAST_MINMOD( deux_dos, prem_dos, deux_prem_dos,
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deux_prem_minus_deux_deux_dos )
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-
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FAST_MINMOD( deux_dos, troi_dos, deux_troi_dos,
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deux_troi_minus_deux_deux_dos )
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+
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2. * dos_two_plus_dos_thr;
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deux_troi_minus_deux_deux_dos );
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/*
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* Compute the needed "down" double resolution pixel value:
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*/
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const double four_times_dostre_two =
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twice_dos_two_plus_tre_two
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+
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FAST_MINMOD( deux_two, prem_two, deux_prem_two,
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deux_prem_minus_deux_deux_two )
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-
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FAST_MINMOD( deux_two, troi_two, deux_troi_two,
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deux_troi_minus_deux_deux_two )
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+
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2. * dos_two_plus_tre_two;
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deux_troi_minus_deux_deux_two );
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/*
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* Compute the "diagonal" (at the boundary between thrr input
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* pixel areas) double resolution pixel value:
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*/
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const double eight_times_dostre_twothr =
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twice_deux_thr_plus_deux_dos
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+
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FAST_MINMOD( deux_tre, prem_tre, deux_prem_tre,
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deux_prem_minus_deux_deux_tre )
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+
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2. * deux_thr_plus_deux_dos
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-
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FAST_MINMOD( deux_tre, troi_tre, deux_troi_tre,
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deux_troi_minus_deux_deux_tre )
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+
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four_times_dos_twothr
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+
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FAST_MINMOD( deux_thr, prem_thr, deux_prem_thr,
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deux_prem_minus_deux_deux_thr )
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+
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four_times_dostre_two
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-
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FAST_MINMOD( deux_thr, troi_thr, deux_troi_thr,
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deux_troi_minus_deux_deux_thr );
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deux_troi_minus_deux_deux_thr )
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+
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four_times_dos_twothr
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+
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four_times_dostre_two;
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/*
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* Return the first newly computed double density values:
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@ -450,8 +457,8 @@ nohalo1( const double uno_two,
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}
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/* Call nohalo1 with an interpolator as a parameter.
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* It'd be nice to do this with templates somehow :-( but I can't see a
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* clean way to do it.
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* It'd be nice to do this with templates somehow :-( but I can't see
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* a clean way to do it.
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*/
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#define NOHALO1_INTER( inter ) \
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template <typename T> static void inline \
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