experimental toFloat32 option

1 files changed, 12 insertions, 5 deletions

diff --git a/src/parseTools.js b/src/parseTools.js
index b655d13e..f11c867a 100644
--- a/src/parseTools.js
+++ b/src/parseTools.js
@@ -2020,6 +2020,13 @@ function makeIsNaN(value) {
   return 'isNaN(' + value + ')';
 }
 
+function makeFloat(value, type) {
+  if (TO_FLOAT32 && type == 'float') {
+    return 'Math.toFloat32(' + value + ')';
+  }
+  return value;
+}
+
 // fptoui and fptosi are not in these, because we need to be careful about what we do there. We can't
 // just sign/unsign the input first.
 var UNSIGNED_OP = set('udiv', 'urem', 'uitofp', 'zext', 'lshr');
@@ -2275,11 +2282,11 @@ function processMathop(item) {
       return idents[0] + ' >>> ' + idents[1];
     }
     // basic float ops
-    case 'fadd': return getFastValue(idents[0], '+', idents[1], item.type);
-    case 'fsub': return getFastValue(idents[0], '-', idents[1], item.type);
-    case 'fdiv': return getFastValue(idents[0], '/', idents[1], item.type);
-    case 'fmul': return getFastValue(idents[0], '*', idents[1], item.type);
-    case 'frem': return getFastValue(idents[0], '%', idents[1], item.type);
+    case 'fadd': return makeFloat(getFastValue(idents[0], '+', idents[1], item.type), item.type);
+    case 'fsub': return makeFloat(getFastValue(idents[0], '-', idents[1], item.type), item.type);
+    case 'fdiv': return makeFloat(getFastValue(idents[0], '/', idents[1], item.type), item.type);
+    case 'fmul': return makeFloat(getFastValue(idents[0], '*', idents[1], item.type), item.type);
+    case 'frem': return makeFloat(getFastValue(idents[0], '%', idents[1], item.type), item.type);
     case 'uitofp': case 'sitofp': return asmCoercion(idents[0], 'double', op[0]);
     case 'fptoui': case 'fptosi': return makeRounding(idents[0], bitsLeft, op === 'fptosi', true);