wasm2js: more js optimization (#2050)

* Emit ints as signed, so -1 isn't a big unsigned number.
* x - -c (where c is a constant) is larger than x + c in js (but not wasm)
* +(+x) => +x
* Avoid unnecessary coercions on calls, return, load, etc. - we just need coercions when entering or exiting "wasm" (not internally), and on actual operations that need them.

1 files changed, 3 insertions, 4 deletions

diff --git a/test/wasm2js/global_i64.2asm.js b/test/wasm2js/global_i64.2asm.js
index 1d5497869..bdd72a121 100644
--- a/test/wasm2js/global_i64.2asm.js
+++ b/test/wasm2js/global_i64.2asm.js
@@ -21,17 +21,16 @@ function asmFunc(global, env, buffer) {
  var abort = env.abort;
  var nan = global.NaN;
  var infinity = global.Infinity;
- var f = 2882400175;
+ var f = -1412567121;
  var f$hi = 305419896;
  function call($0, $0$hi) {
-  $0 = $0 | 0;
-  $0$hi = $0$hi | 0;
+  
  }
  
  function $1() {
   var i64toi32_i32$0 = 0;
   i64toi32_i32$0 = f$hi;
-  call(f | 0, i64toi32_i32$0 | 0);
+  call(f, i64toi32_i32$0);
   i64toi32_i32$0 = 287454020;
   f = 1432778632;
   f$hi = i64toi32_i32$0;