1 files changed, 29 insertions, 2 deletions
diff --git a/src/library.js b/src/library.js
index b9c13055..104b0dc4 100644
--- a/src/library.js
+++ b/src/library.js
@@ -4771,15 +4771,42 @@ LibraryManager.library = {
   // type_info for void*.
   _ZTIPv: [0],
 
+  llvm_uadd_with_overflow_i8: function(x, y) {
+    x = x & 0xff;
+    y = y & 0xff;
+    return {
+      f0: (x+y) & 0xff,
+      f1: x+y > 255
+    };
+  },
+
+  llvm_umul_with_overflow_i8: function(x, y) {
+    x = x & 0xff;
+    y = y & 0xff;
+    return {
+      f0: (x*y) & 0xff,
+      f1: x*y > 255
+    };
+  },
+
   llvm_uadd_with_overflow_i16: function(x, y) {
-    x = (x>>>0) & 0xffff;
-    y = (y>>>0) & 0xffff;
+    x = x & 0xffff;
+    y = y & 0xffff;
     return {
       f0: (x+y) & 0xffff,
       f1: x+y > 65535
     };
   },
 
+  llvm_umul_with_overflow_i16: function(x, y) {
+    x = x & 0xffff;
+    y = y & 0xffff;
+    return {
+      f0: (x*y) & 0xffff,
+      f1: x*y > 65535
+    };
+  },
+
   llvm_uadd_with_overflow_i32: function(x, y) {
     x = x>>>0;
     y = y>>>0;