remove legacy support for polyfilling Math.clz32, imul, trunc

kripken · kripken · commit d820bc178e55 · 2017-11-22T14:46:03.000-08:00
diff --git a/src/preamble.js b/src/preamble.js
@@ -1678,46 +1678,6 @@ function writeAsciiToMemory(str, buffer, dontAddNull) {
 {{{ unSign }}}
 {{{ reSign }}}
 
-// check for imul support, and also for correctness ( https://bugs.webkit.org/show_bug.cgi?id=126345 )
-if (!Math['imul'] || Math['imul'](0xffffffff, 5) !== -5) Math['imul'] = function imul(a, b) {
-  var ah  = a >>> 16;
-  var al = a & 0xffff;
-  var bh  = b >>> 16;
-  var bl = b & 0xffff;
-  return (al*bl + ((ah*bl + al*bh) << 16))|0;
-};
-Math.imul = Math['imul'];
-
-#if PRECISE_F32
-#if PRECISE_F32 == 1
-if (!Math['fround']) {
-  var froundBuffer = new Float32Array(1);
-  Math['fround'] = function(x) { froundBuffer[0] = x; return froundBuffer[0] };
-}
-#else // 2
-if (!Math['fround']) Math['fround'] = function(x) { return x };
-#endif
-Math.fround = Math['fround'];
-#else
-#if SIMD
-if (!Math['fround']) Math['fround'] = function(x) { return x };
-#endif
-#endif
-
-if (!Math['clz32']) Math['clz32'] = function(x) {
-  x = x >>> 0;
-  for (var i = 0; i < 32; i++) {
-    if (x & (1 << (31 - i))) return i;
-  }
-  return 32;
-};
-Math.clz32 = Math['clz32']
-
-if (!Math['trunc']) Math['trunc'] = function(x) {
-  return x < 0 ? Math.ceil(x) : Math.floor(x);
-};
-Math.trunc = Math['trunc'];
-
 var Math_abs = Math.abs;
 var Math_cos = Math.cos;
 var Math_sin = Math.sin;
