do not outline the entire stack prelude, including STACKTOP = ..

1 files changed, 10 insertions, 1 deletions

diff --git a/tools/js-optimizer.js b/tools/js-optimizer.js
index fc195e03..21fce2c2 100644
--- a/tools/js-optimizer.js
+++ b/tools/js-optimizer.js
@@ -4775,7 +4775,16 @@ function outline(ast) {
         for (var i = minIndex; i < stats.length; i++) {
           var stat = stats[i];
           if (stat[0] == 'stat') stat = stat[1];
-          if (stat[0] == 'assign' && stat[2][0] == 'name' && stat[2][1] == 'sp') minIndex = i+1; // cannot outline |sp = |
+          if (stat[0] == 'assign' && stat[2][0] == 'name' && stat[2][1] == 'sp') {
+            // cannot outline |sp = |
+            minIndex = i+1;
+            // When followed by a STACKTOP bump, preserve that too (we may need to replace it later)
+            stat = stats[i+1];
+            if (stat[0] == 'stat') stat = stat[1];
+            if (stat && stat[0] == 'assign' && stat[2][0] == 'name' && stat[2][1] == 'STACKTOP') {
+              minIndex = i+2;
+            }
+          }
         }
       }
     }