Ensure UseRegisterAtStart not used with fixed temp/return register

test/mjsunit/regress/regress-201590.js

Index: test/mjsunit/regress/regress-201590.js
diff --git a/test/mjsunit/compiler/multiply-sub.js b/test/mjsunit/regress/regress-201590.js
similarity index 60%
copy from test/mjsunit/compiler/multiply-sub.js
copy to test/mjsunit/regress/regress-201590.js
index 4793181d47a2b4a2b2390f5049758e651ef1ec1c..0e7ba572332eca6f1ccc49d76ade086b411a24da 100644
--- a/test/mjsunit/compiler/multiply-sub.js
+++ b/test/mjsunit/regress/regress-201590.js
@@ -26,31 +26,41 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
-// Test expressions that can be computed with a multiply-add instruction.
 
-function f(a, b, c) {
-  return a - b * c;
-}
+var gdpRatio = 16/9;
 
-function g(a, b, c) {
-  return a * b - c;
+function Foo(initialX, initialY, initialScale, initialMapHeight) {
+  this.ORIGIN = { x: initialX, y: initialY };
+  this.scale = initialScale;
+  this.mapHeight = initialMapHeight;
 }
 
-function h(a, b, c, d) {
-  return a * b - c * d;
+Foo.prototype.bar = function (x, y, xOffset, yOffset) {
+  var tileHeight =  64 * 0.25 * this.scale,
+  tileWidth  = 128 * 0.25 * this.scale,
+  xOffset    = xOffset * 0.5 || 0,
+  yOffset    = yOffset * 0.5 || 0;
+  var xPos = ((xOffset) * gdpRatio) + this.ORIGIN.x * this.scale -
+      ((y * tileWidth ) * gdpRatio) + ((x * tileWidth ) * gdpRatio);
+  var yPos = ((yOffset) * gdpRatio) + this.ORIGIN.y * this.scale +
+      ((y * tileHeight) * gdpRatio) + ((x * tileHeight) * gdpRatio);
+  xPos = xPos - Math.round(((tileWidth) * gdpRatio)) +
+      this.mapHeight * Math.round(((tileWidth) * gdpRatio));
+  return {
+      x: Math.floor(xPos),
+      y: Math.floor(yPos)
+  };
 }
 
-assertEquals(-5.41, f(1.1, 2.1, 3.1));
-assertEquals(-5.41, f(1.1, 2.1, 3.1));
-%OptimizeFunctionOnNextCall(f);
-assertEquals(-5.41, f(1.1, 2.1, 3.1));
+var f = new Foo(10, 20, 2.5, 400);
 
-assertEquals(8.36, g(2.2, 3.3, -1.1));
-assertEquals(8.36, g(2.2, 3.3, -1.1));
-%OptimizeFunctionOnNextCall(g);
-assertEquals(8.36, g(2.2, 3.3, -1.1));
+function baz() {
+  var b = f.bar(1.1, 2.2, 3.3, 4.4);
+  assertEquals(56529, b.x);
+  assertEquals(288, b.y);
+}
 
-assertEquals(-1.5, h(1.5, 3.0, 12, 0.5));
-assertEquals(-1.5, h(1.5, 3.0, 12, 0.5));
-%OptimizeFunctionOnNextCall(h);
-assertEquals(-1.5, h(1.5, 3.0, 12, 0.5));
+baz();
+baz();
+%OptimizeFunctionOnNextCall(Foo.prototype.bar);
+baz();