Merge revision 6500-6600 from bleeding_edge to the isolates branch.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
===================================================================
--- src/ia32/code-stubs-ia32.cc	(revision 7030)
+++ src/ia32/code-stubs-ia32.cc	(working copy)
@@ -39,6 +39,28 @@
 namespace internal {
 
 #define __ ACCESS_MASM(masm)
+
+void ToNumberStub::Generate(MacroAssembler* masm) {
+  // The ToNumber stub takes one argument in eax.
+  NearLabel check_heap_number, call_builtin;
+  __ test(eax, Immediate(kSmiTagMask));
+  __ j(not_zero, &check_heap_number);
+  __ ret(0);
+
+  __ bind(&check_heap_number);
+  __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset));
+  __ cmp(Operand(ebx), Immediate(FACTORY->heap_number_map()));
+  __ j(not_equal, &call_builtin);
+  __ ret(0);
+
+  __ bind(&call_builtin);
+  __ pop(ecx);  // Pop return address.
+  __ push(eax);
+  __ push(ecx);  // Push return address.
+  __ InvokeBuiltin(Builtins::TO_NUMBER, JUMP_FUNCTION);
+}
+
+
 void FastNewClosureStub::Generate(MacroAssembler* masm) {
   // Create a new closure from the given function info in new
   // space. Set the context to the current context in esi.
@@ -3483,10 +3505,12 @@
   __ j(not_equal, &not_minus_half);
 
   // Calculates reciprocal of square root.
-  // Note that 1/sqrt(x) = sqrt(1/x))
-  __ divsd(xmm3, xmm0);
+  // sqrtsd returns -0 when input is -0.  ECMA spec requires +0.
+  __ xorpd(xmm1, xmm1);
+  __ addsd(xmm1, xmm0);
+  __ sqrtsd(xmm1, xmm1);
+  __ divsd(xmm3, xmm1);
   __ movsd(xmm1, xmm3);
-  __ sqrtsd(xmm1, xmm1);
   __ jmp(&allocate_return);
 
   // Test for 0.5.
@@ -3498,7 +3522,9 @@
   __ ucomisd(xmm2, xmm1);
   __ j(not_equal, &call_runtime);
   // Calculates square root.
-  __ movsd(xmm1, xmm0);
+  // sqrtsd returns -0 when input is -0.  ECMA spec requires +0.
+  __ xorpd(xmm1, xmm1);
+  __ addsd(xmm1, xmm0);
   __ sqrtsd(xmm1, xmm1);
 
   __ bind(&allocate_return);