# HG changeset patch
# User Adam Chlipala <adam@chlipala.net>
# Date 1422811754 18000
# Node ID 9e9c915f554cd6c11245ab5daca801caa65ff668
# Parent  f42fea631c1dbef3b047b50ae3a9aa90c9f0ffb8
A new MonoReduce optimization for lifting 'let' out of field projection; JavaScript compilation for exponentiation

diff -r f42fea631c1d -r 9e9c915f554c lib/js/urweb.js
--- a/lib/js/urweb.js	Wed Jan 28 08:47:04 2015 -0500
+++ b/lib/js/urweb.js	Sun Feb 01 12:29:14 2015 -0500
@@ -112,6 +112,10 @@
     return Math.round(n);
 }
 
+function pow(n, m) {
+    return Math.pow(n, m);
+}
+
 
 // Time, represented as counts of microseconds since the epoch
 
diff -r f42fea631c1d -r 9e9c915f554c src/jscomp.sml
--- a/src/jscomp.sml	Wed Jan 28 08:47:04 2015 -0500
+++ b/src/jscomp.sml	Sun Feb 01 12:29:14 2015 -0500
@@ -724,6 +724,8 @@
                                              | "<" => "lt"
                                              | "<=" => "le"
                                              | "strcmp" => "strcmp"
+                                             | "powl" => "pow"
+                                             | "powf" => "pow"
                                              | _ => raise Fail ("Jscomp: Unknown binary operator " ^ s)
 
                                 val (e1, st) = jsE inner (e1, st)
diff -r f42fea631c1d -r 9e9c915f554c src/mono_reduce.sml
--- a/src/mono_reduce.sml	Wed Jan 28 08:47:04 2015 -0500
+++ b/src/mono_reduce.sml	Sun Feb 01 12:29:14 2015 -0500
@@ -818,10 +818,19 @@
                                 search pes
                         end
 
-                      | EField ((ERecord xes, _), x) =>
-                        (case List.find (fn (x', _, _) => x' = x) xes of
-                             SOME (_, e, _) => #1 e
-                           | NONE => e)
+                      | EField (e1, x) =>
+                        let
+                            fun yankLets (e : exp) =
+                                case #1 e of
+                                    ELet (x, t, e1, e2) => (ELet (x, t, e1, yankLets e2), #2 e)
+                                  | ERecord xes =>
+                                    (case List.find (fn (x', _, _) => x' = x) xes of
+                                         SOME (_, e, _) => e
+                                       | NONE => (EField (e, x), #2 e))
+                                  | _ => (EField (e, x), #2 e)
+                        in
+                            #1 (yankLets e1)
+                        end
 
                       | ELet (x1, t1, (ELet (x2, t2, e1, b1), loc), b2) =>
                         let