compiler.cfg.*: stub docs for register scheduling vocabs

basis/compiler/cfg/def-use/def-use-docs.factor

@@ -0,0 +1,24 @@
+USING: compiler.cfg.instructions help.markup help.syntax sequences ;
+IN: compiler.cfg.def-use
+
+HELP: defs-vregs
+{ $values { "insn" insn } { "seq" sequence } }
+{ $description "Returns the sequence of vregs defined, or introduced, by this instruction." }
+{ $examples
+  { $example
+    "USING: compiler.cfg.def-use prettyprint ;"
+    "T{ ##peek f 37 D 0 0 } defs-vregs ."
+    "{ 37 }"
+  }
+} ;
+
+HELP: uses-vregs
+{ $values { "insn" insn } { "seq" sequence } }
+{ $description "Returns the sequence of vregs used by this instruction." }
+{ $examples
+  { $example
+    "USING: compiler.cfg.def-use prettyprint ;"
+    "T{ ##replace f 37 D 1 6 } uses-vregs ."
+    "{ 37 }"
+  }
+} ;

basis/compiler/cfg/dependence/dependence-docs.factor

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+USING: compiler.cfg.instructions help.markup help.syntax sequences ;
+IN: compiler.cfg.dependence
+
+HELP: <node>
+{ $values { "insn" insn } { "node" node } }
+{ $description "Creates a new dependency graph node from an CFG instruction." } ;

basis/compiler/cfg/scheduling/scheduling-docs.factor

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+USING: compiler.cfg compiler.cfg.height help.markup help.syntax sequences ;
+IN: compiler.cfg.scheduling
+
+HELP: number-insns
+{ $values { "insns" sequence } }
+{ $description "Assigns a sequence number to the " { $slot "insn#" } " slot of each instruction in the sequence." } ;
+
+HELP: schedule-instructions
+{ $values { "cfg" cfg } { "cfg'" cfg } }
+{ $description "Performs a instruction scheduling optimization pass over the CFG to attempt to reduce the number of spills. The step must be performed after " { $link normalize-height } " or else invalid peeks might be inserted into the CFG." } ;