basis/compiler/cfg/linear-scan/linear-scan.factor

   1 ! Copyright (C) 2008, 2009 Slava Pestov.
   2 ! See http://factorcode.org/license.txt for BSD license.
   3 USING: kernel accessors namespaces make
   4 cpu.architecture
   5 compiler.cfg
   6 compiler.cfg.rpo
   7 compiler.cfg.instructions
   8 compiler.cfg.linear-scan.numbering
   9 compiler.cfg.linear-scan.live-intervals
  10 compiler.cfg.linear-scan.allocation
  11 compiler.cfg.linear-scan.assignment ;
  12 IN: compiler.cfg.linear-scan
  13
  14 ! References:
  15
  16 ! Linear Scan Register Allocation
  17 ! by Massimiliano Poletto and Vivek Sarkar
  18 ! http://www.cs.ucla.edu/~palsberg/course/cs132/linearscan.pdf
  19
  20 ! Linear Scan Register Allocation for the Java HotSpot Client Compiler
  21 ! by Christian Wimmer
  22 ! and http://www.ssw.uni-linz.ac.at/Research/Papers/Wimmer04Master/
  23
  24 ! Quality and Speed in Linear-scan Register Allocation
  25 ! by Omri Traub, Glenn Holloway, Michael D. Smith
  26 ! http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.34.8435
  27
  28 : (linear-scan) ( rpo -- )
  29     dup number-instructions
  30     dup compute-live-intervals
  31     machine-registers allocate-registers assign-registers ;
  32
  33 : linear-scan ( cfg -- cfg' )
  34     [
  35         dup reverse-post-order (linear-scan)
  36         spill-counts get >>spill-counts
  37     ] with-scope ;