Things the optimizer does not catch

Author: dcodeIO

tests/compiler/memcpy.optimized.wast

@@ -17,10 +17,7 @@
    (if
     (if (result i32)
      (tee_local $3
-      (i32.ne
-       (get_local $2)
-       (i32.const 0)
-      )
+      (get_local $2)
      )
      (i32.rem_s
       (get_local $1)

tests/compiler/memcpy.ts

@@ -4,7 +4,7 @@ export function memcpy(dest: usize, src: usize, n: usize): usize {
   let w: u32, x: u32;
 
   // copy 1 byte each until src is aligned to 4 bytes
-  while (n != 0 && s % 4 != 0) {
+  while (n && s % 4) {
     store<u8>(d++, load<u8>(s++));
     n--;
   }

tests/compiler/memcpy.wast

@@ -108,17 +108,11 @@
     (if
      (if (result i32)
       (tee_local $7
-       (i32.ne
-        (get_local $2)
-        (i32.const 0)
-       )
+       (get_local $2)
       )
-      (i32.ne
-       (i32.rem_s
-        (get_local $4)
-        (i32.const 4)
-       )
-       (i32.const 0)
+      (i32.rem_s
+       (get_local $4)
+       (i32.const 4)
       )
       (get_local $7)
      )