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, 11 deletions

diff --git a/test/wasm2js/select.2asm.js b/test/wasm2js/select.2asm.js
index 09fab1117..c50a01a47 100644
--- a/test/wasm2js/select.2asm.js
+++ b/test/wasm2js/select.2asm.js
@@ -78,11 +78,6 @@ function asmFunc(global, env, buffer) {
  }
  
  function legalstub$1($0_1, $1_1, $2_1, $3_1, $4_1) {
-  $0_1 = $0_1 | 0;
-  $1_1 = $1_1 | 0;
-  $2_1 = $2_1 | 0;
-  $3_1 = $3_1 | 0;
-  $4_1 = $4_1 | 0;
   var i64toi32_i32$2 = 0, i64toi32_i32$1 = 0, i64toi32_i32$4 = 0, i64toi32_i32$0 = 0, i64toi32_i32$3 = 0, $22 = 0, $23 = 0, $24 = 0, $7 = 0, $7$hi = 0, $10$hi = 0, $11 = 0, $11$hi = 0, $13 = 0, $13$hi = 0, $16$hi = 0, $17 = 0, $17$hi = 0, $5_1 = 0, $5$hi = 0;
   i64toi32_i32$0 = 0;
   $7 = $0_1;
@@ -140,7 +135,7 @@ function asmFunc(global, env, buffer) {
   $17$hi = i64toi32_i32$1;
   i64toi32_i32$1 = $11$hi;
   i64toi32_i32$2 = $17$hi;
-  i64toi32_i32$2 = $1($11 | 0, i64toi32_i32$1 | 0, $17 | 0, i64toi32_i32$2 | 0, $4_1 | 0) | 0;
+  i64toi32_i32$2 = $1($11, i64toi32_i32$1, $17, i64toi32_i32$2, $4_1);
   i64toi32_i32$1 = i64toi32_i32$HIGH_BITS;
   $5_1 = i64toi32_i32$2;
   $5$hi = i64toi32_i32$1;
@@ -161,14 +156,11 @@ function asmFunc(global, env, buffer) {
   }
   setTempRet0($24 | 0);
   i64toi32_i32$2 = $5$hi;
-  return $5_1 | 0;
+  return $5_1;
  }
  
  function legalstub$2($0_1, $1_1, $2_1) {
-  $0_1 = +$0_1;
-  $1_1 = +$1_1;
-  $2_1 = $2_1 | 0;
-  return +(+Math_fround($2(Math_fround(Math_fround($0_1)), Math_fround(Math_fround($1_1)), $2_1 | 0)));
+  return +$2(Math_fround($0_1), Math_fround($1_1), $2_1);
  }
  
  var FUNCTION_TABLE = [];