ARM: Add type-feedback recording for compare...

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
===================================================================
--- src/arm/code-stubs-arm.cc	(revision 6683)
+++ src/arm/code-stubs-arm.cc	(working copy)
@@ -1298,7 +1298,11 @@
 void ToBooleanStub::Generate(MacroAssembler* masm) {
   Label false_result;
   Label not_heap_number;
-  Register scratch = r7;
+  Register scratch = r9;

[Alexandre, 2011/02/09 13:57:16]

Is this more readable?
Register scratch = r9.is(tos_) ? r7 : r9;

[Søren Thygesen Gjesse, 2011/02/09 14:48:28]

Done.

+  if (scratch.is(tos_)) {
+    scratch = r7;
+  }
+  ASSERT(!tos_.is(scratch));
 
   __ LoadRoot(ip, Heap::kNullValueRootIndex);
   __ cmp(tos_, ip);
@@ -5809,10 +5813,9 @@
     // For equality we do not care about the sign of the result.
     __ sub(r0, r0, r1, SetCC);
   } else {
-    __ sub(r1, r1, r0, SetCC);
-    // Correct sign of result in case of overflow.
-    __ rsb(r1, r1, Operand(0), SetCC, vs);
-    __ mov(r0, r1);
+    // Untag before subtracting to avoid handling overflow.
+    __ SmiUntag(r1);
+    __ sub(r0, r1, SmiUntagOperand(r0));
   }
   __ Ret();