Support SAB atomics for offset-TypedArray

test/mjsunit/asm/atomics-compareexchange.js

Index: test/mjsunit/asm/atomics-compareexchange.js
diff --git a/test/mjsunit/asm/atomics-compareexchange.js b/test/mjsunit/asm/atomics-compareexchange.js
index edcd7f908c7f97007d19b6143ff8dd3bfdfec736..84d38504b32933c51ee8c5049d3e49975c9fd6f2 100644
--- a/test/mjsunit/asm/atomics-compareexchange.js
+++ b/test/mjsunit/asm/atomics-compareexchange.js
@@ -4,14 +4,14 @@
 
 // Flags: --harmony-sharedarraybuffer
 
-function Module(stdlib, foreign, heap) {
+function Module(stdlib, foreign, heap, offset) {
   "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 MEM8 = new stdlib.Int8Array(heap, offset);
+  var MEM16 = new stdlib.Int16Array(heap, offset);
+  var MEM32 = new stdlib.Int32Array(heap, offset);
+  var MEMU8 = new stdlib.Uint8Array(heap, offset);
+  var MEMU16 = new stdlib.Uint16Array(heap, offset);
+  var MEMU32 = new stdlib.Uint32Array(heap, offset);
   var compareExchange = stdlib.Atomics.compareExchange;
   var fround = stdlib.Math.fround;
 
@@ -67,9 +67,6 @@ function Module(stdlib, foreign, heap) {
   };
 }
 
-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) {
@@ -77,10 +74,10 @@ function clearArray() {
   }
 }
 
-function testElementType(taConstr, f, oobValue) {
+function testElementType(taConstr, f, oobValue, offset) {
   clearArray();
 
-  var ta = new taConstr(sab);
+  var ta = new taConstr(sab, offset);
   var name = Object.prototype.toString.call(ta);
   assertEquals(0, ta[0]);
   assertEquals(0, f(0, 0, 50), name);
@@ -93,9 +90,21 @@ function testElementType(taConstr, f, oobValue) {
   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);
+function testElement(m, offset) {
+  testElementType(Int8Array, m.compareExchangei8, 0, offset);
+  testElementType(Int16Array, m.compareExchangei16, 0, offset);
+  testElementType(Int32Array, m.compareExchangei32, 0, offset);
+  testElementType(Uint8Array, m.compareExchangeu8, 0, offset);
+  testElementType(Uint16Array, m.compareExchangeu16, 0, offset);
+  testElementType(Uint32Array, m.compareExchangeu32, 0, offset);
+}
+
+var offset = 0;
+var sab = new SharedArrayBuffer(16);
+var m1 = Module(this, {}, sab, offset);
+testElement(m1, offset);
+
+offset = 32;
+sab = new SharedArrayBuffer(64);
+var m2 = Module(this, {}, sab, offset);
+testElement(m2, offset);