! Copyright (C) 2011 Alex Vondrak.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors assocs compiler.cfg
-compiler.cfg.dataflow-analysis
-compiler.cfg.def-use
-compiler.cfg.predecessors compiler.cfg.rpo deques dlists
-hashtables kernel locals namespaces sequences sets ;
-FROM: namespaces => set ;
+compiler.cfg.dataflow-analysis compiler.cfg.def-use
+compiler.cfg.gvn.graph compiler.cfg.renaming.functor
+compiler.utilities hashtables kernel namespaces sequences ;
IN: compiler.cfg.gvn.avail
: defined ( bb -- vregs )
FORWARD-ANALYSIS: avail
-M: avail-analysis transfer-set drop defined assoc-union ;
+M: avail transfer-set drop defined assoc-union ;
-: available? ( vn -- ? )
- basic-block get avail-ins get at key? ;
+: available? ( vn -- ? ) basic-block get avail-in key? ;
-: make-available ( insn -- insn )
- dup dst>>
- basic-block get avail-ins get [ dupd ?set-at ] change-at ;
+: best-vreg ( available-vregs -- vreg )
+ [ f ] [ infimum ] if-empty ;
+
+: >avail-vreg ( vreg -- vreg/f )
+ final-iteration? get [
+ congruence-class [ available? ] filter best-vreg
+ ] when ;
+
+: available-uses? ( insn -- ? )
+ uses-vregs [ >avail-vreg ] all? ;
+
+: with-available-uses? ( quot -- ? )
+ keep swap [ available-uses? ] [ drop f ] if ; inline
+
+: make-available ( vreg -- )
+ basic-block get avail-ins get [ dupd clone ?set-at ] assocs:change-at ;
+
+RENAMING: >avail [ ] [ dup >avail-vreg swap or ] [ ]