Reland "Add DoubleTestOp instruction"

runtime/vm/intrinsifier_arm.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 1404 matching lines @@
     __ LoadDFromOffset(D0, R0, Double::value_offset() - kHeapObjectTag);
     __ vcmpd(D0, D0);
     __ vmstat();
     __ LoadObject(R0, Bool::False(), VC);
     __ LoadObject(R0, Bool::True(), VS);
     __ Ret();
   }
 }
 
 
+void Intrinsifier::Double_getIsInfinite(Assembler* assembler) {
+  if (TargetCPUFeatures::vfp_supported()) {
+    __ ldr(R0, Address(SP, 0 * kWordSize));
+    // R1 <- value[0:31], R2 <- value[32:63]
+    __ LoadFieldFromOffset(kWord, R1, R0, Double::value_offset());
+    __ LoadFieldFromOffset(kWord, R2, R0, Double::value_offset() + kWordSize);
+
+    // If the low word isn't 0, then it isn't infinity.
+    __ cmp(R1, Operand(0));
+    __ LoadObject(R0, Bool::False(), NE);
+    __ bx(LR, NE);  // Return if NE.
+
+    // Mask off the sign bit.
+    __ AndImmediate(R2, R2, 0x7FFFFFFF);
+    // Compare with +infinity.
+    __ CompareImmediate(R2, 0x7FF00000);
+    __ LoadObject(R0, Bool::False(), NE);
+    __ bx(LR, NE);
+
+    __ LoadObject(R0, Bool::True());
+    __ Ret();
+  }
+}
+
+
 void Intrinsifier::Double_getIsNegative(Assembler* assembler) {
   if (TargetCPUFeatures::vfp_supported()) {
     Label is_false, is_true, is_zero;
     __ ldr(R0, Address(SP, 0 * kWordSize));
     __ LoadDFromOffset(D0, R0, Double::value_offset() - kHeapObjectTag);
     __ vcmpdz(D0);
     __ vmstat();
     __ b(&is_false, VS);  // NaN -> false.
     __ b(&is_zero, EQ);  // Check for negative zero.
     __ b(&is_false, CS);  // >= 0 -> false.
@@ skipping 693 matching lines @@
   __ ldr(R0, Address(R0, TimelineStream::enabled_offset()));
   __ cmp(R0, Operand(0));
   __ LoadObject(R0, Bool::True(), NE);
   __ LoadObject(R0, Bool::False(), EQ);
   __ Ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM