[Atomics] Remove support for atomic accesses on floating-point values.

test/mjsunit/asm/atomics-compareexchange.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --harmony-sharedarraybuffer
 
 function Module(stdlib, foreign, heap) {
   "use asm";
   var MEM8 = new stdlib.Int8Array(heap);
   var MEM16 = new stdlib.Int16Array(heap);
   var MEM32 = new stdlib.Int32Array(heap);
   var MEMU8 = new stdlib.Uint8Array(heap);
   var MEMU16 = new stdlib.Uint16Array(heap);
   var MEMU32 = new stdlib.Uint32Array(heap);
-  var MEMF32 = new stdlib.Float32Array(heap);
-  var MEMF64 = new stdlib.Float64Array(heap);
   var compareExchange = stdlib.Atomics.compareExchange;
   var fround = stdlib.Math.fround;
 
   function compareExchangei8(i, o, n) {
     i = i | 0;
     o = o | 0;
     n = n | 0;
     return compareExchange(MEM8, i, o, n)|0;
   }
 
@@ skipping 25 matching lines @@
     return compareExchange(MEMU16, i, o, n)>>>0;
   }
 
   function compareExchangeu32(i, o, n) {
     i = i | 0;
     o = o >>> 0;
     n = n >>> 0;
     return compareExchange(MEMU32, i, o, n)>>>0;
   }
 
-  function compareExchangef32(i, o, n) {
-    i = i | 0;
-    o = fround(o);
-    n = fround(n);
-    return fround(compareExchange(MEMF32, i, o, n));
-  }
-
-  function compareExchangef64(i, o, n) {
-    i = i | 0;
-    o = +o;
-    n = +n;
-    return +compareExchange(MEMF64, i, o, n);
-  }
-
   return {
     compareExchangei8: compareExchangei8,
     compareExchangei16: compareExchangei16,
     compareExchangei32: compareExchangei32,
     compareExchangeu8: compareExchangeu8,
     compareExchangeu16: compareExchangeu16,
     compareExchangeu32: compareExchangeu32,
-    compareExchangef32: compareExchangef32,
-    compareExchangef64: compareExchangef64
   };
 }
 
 var sab = new SharedArrayBuffer(16);
 var m = Module(this, {}, sab);
 
 function clearArray() {
   var ui8 = new Uint8Array(sab);
   for (var i = 0; i < sab.byteLength; ++i) {
     ui8[i] = 0;
@@ skipping 15 matching lines @@
   assertEquals(oobValue, f(-1, 0, 0), name);
   assertEquals(oobValue, f(ta.length, 0, 0), name);
 }
 
 testElementType(Int8Array, m.compareExchangei8, 0);
 testElementType(Int16Array, m.compareExchangei16, 0);
 testElementType(Int32Array, m.compareExchangei32, 0);
 testElementType(Uint8Array, m.compareExchangeu8, 0);
 testElementType(Uint16Array, m.compareExchangeu16, 0);
 testElementType(Uint32Array, m.compareExchangeu32, 0);
-testElementType(Float32Array, m.compareExchangef32, NaN);
-testElementType(Float64Array, m.compareExchangef64, NaN);