compiler.tree.dead-code.simple: tests and more docs

basis/compiler/tree/dead-code/simple/simple-docs.factor

@@ -1,6 +1,10 @@
-USING: compiler.tree help.markup help.syntax sequences ;
+USING: compiler.tree help.markup help.syntax kernel sequences ;
 IN: compiler.tree.dead-code.simple
 
+HELP: dead-flushable-call?
+{ $values { "#call" #call } { "?" boolean } }
+{ $description { $link t } " if the called word is flushable and none of its outputs are used." } ;
+
 HELP: filter-corresponding
 { $values { "new" sequence } { "old" sequence } { "old'" sequence } }
 { $description "Remove elements from 'old' if the element with the same index in 'new' is dead." } ;

basis/compiler/tree/dead-code/simple/simple-tests.factor

@@ -0,0 +1,23 @@
+USING: accessors compiler.tree compiler.tree.dead-code.liveness
+compiler.tree.dead-code.simple kernel math namespaces tools.test ;
+IN: compiler.tree.dead-code.simple.tests
+
+! dead-flushable-call?
+{ t } [
+    { } { } \ + <#call> dead-flushable-call?
+] unit-test
+
+{ f t } [
+    H{ { 3 t } } live-values set
+    { 1 2 } { 3 } \ + <#call> dead-flushable-call?
+    { 1 2 } { 77 } \ + <#call> dead-flushable-call?
+] unit-test
+
+{
+    f
+    "foo" { 3 }
+} [
+    H{ { 3 t } } live-values set
+    "foo" 9 <#push> remove-dead-code*
+    "foo" 3 <#push> remove-dead-code* [ literal>> ] [ out-d>> ] bi
+] unit-test