added a parameter to switch between different letrec handling routines

scheme/ikarus.compiler.optimize-letrec.ss

@@ -1,6 +1,6 @@
 
 
-(module (debug-scc optimize-letrec)
+(module (debug-scc optimize-letrec current-letrec-pass)
 
 
   (define (unique-prelex x) 
@@ -468,10 +468,20 @@
   (define debug-scc (make-parameter #f))
 
   (define current-letrec-pass
-    (make-parameter optimize-letrec/scc))
+    (make-parameter 'scc
+      (lambda (x)
+        (if (memq x '(scc waddell basic))
+            x
+            (die 'current-letrec-pass "invalid" x)))))
+      
 
   (define (optimize-letrec x)
-    ((current-letrec-pass) x)))
+    (case (current-letrec-pass)
+      [(scc)     (optimize-letrec/scc x)]
+      [(waddell) (optimize-letrec/waddell x)]
+      [(basic)   (optimize-letrec/basic x)]
+      [else (die 'optimize-letrec "invalid" (current-letrec-pass))]))
+)
 
 
 

scheme/ikarus.compiler.ss

@@ -22,7 +22,7 @@
           expand expand/optimize expand/scc-letrec optimizer-output
           cp0-effort-limit cp0-size-limit optimize-level 
           perform-tag-analysis tag-analysis-output
-          strip-source-info generate-debug-calls)
+          strip-source-info generate-debug-calls current-letrec-pass)
   (import 
     (rnrs hashtables)
     (ikarus system $fx)
@@ -37,7 +37,7 @@
         cp0-size-limit cp0-effort-limit 
         expand/optimize expand/scc-letrec expand optimizer-output
         tag-analysis-output perform-tag-analysis
-        current-core-eval)
+        current-core-eval current-letrec-pass)
     (ikarus include)
     (ikarus.fasl.write)
     (ikarus.intel-assembler))

scheme/last-revision

@@ -1 +1 @@
-1823
+1824

scheme/makefile.ss

@@ -17,6 +17,7 @@
 ;;; vim:syntax=scheme
 (import (only (ikarus) import))
 (import (except (ikarus) 
+          current-letrec-pass
           current-core-eval
           assembler-output optimize-cp optimize-level
           cp0-size-limit cp0-effort-limit expand/optimize
@@ -1502,6 +1503,7 @@
     [cp0-effort-limit i]
     [tag-analysis-output i]
     [perform-tag-analysis i]
+    [current-letrec-pass i]
     [pointer?                          $for]
     [pointer->integer                  $for]
     [integer->pointer                  $for]