ARM: Use the vsqrt instruction when available...

src/arm/macro-assembler-arm.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1351 matching lines @@
                                                        Register outHighReg,
                                                        Register outLowReg) {
   // ARMv7 VFP3 instructions to implement integer to double conversion.
   mov(r7, Operand(inReg, ASR, kSmiTagSize));
   vmov(s15, r7);
   vcvt_f64_s32(d7, s15);
   vmov(outLowReg, outHighReg, d7);
 }
 
 
+void MacroAssembler::ObjectToDoubleVFPRegister(Register object,
+                                               DwVfpRegister result,
+                                               Register scratch1,
+                                               Register scratch2,
+                                               Register heap_number_map,
+                                               SwVfpRegister scratch3,
+                                               Label* not_number,
+                                               ObjectToDoubleFlags flags) {
+  Label done;
+  if ((flags & OBJECT_NOT_SMI) == 0) {
+    Label not_smi;
+    BranchOnNotSmi(object, &not_smi);
+    // Remove smi tag and convert to double.
+    mov(scratch1, Operand(object, ASR, kSmiTagSize));
+    vmov(scratch3, scratch1);
+    vcvt_f64_s32(result, scratch3);
+    b(&done);
+    bind(&not_smi);
+  }
+  // Check for heap number and load double value from it.
+  ldr(scratch1, FieldMemOperand(object, HeapObject::kMapOffset));
+  sub(scratch2, object, Operand(kHeapObjectTag));
+  cmp(scratch1, heap_number_map);
+  b(ne, not_number);
+  if ((flags & AVOID_NANS_AND_INFINITIES) != 0) {
+    // If exponent is all ones the number is either a NaN or +/-Infinity.
+    ldr(scratch1, FieldMemOperand(object, HeapNumber::kExponentOffset));
+    Sbfx(scratch1,
+         scratch1,
+         HeapNumber::kExponentShift,
+         HeapNumber::kExponentBits);
+    // All-one value sign extend to -1.
+    cmp(scratch1, Operand(-1));
+    b(eq, not_number);
+  }
+  vldr(result, scratch2, HeapNumber::kValueOffset);
+  bind(&done);
+}
+
+
+void MacroAssembler::SmiToDoubleVFPRegister(Register smi,
+                                            DwVfpRegister value,
+                                            Register scratch1,
+                                            SwVfpRegister scratch2) {
+  mov(scratch1, Operand(smi, ASR, kSmiTagSize));
+  vmov(scratch2, scratch1);
+  vcvt_f64_s32(value, scratch2);
+}
+
+
 void MacroAssembler::GetLeastBitsFromSmi(Register dst,
                                          Register src,
                                          int num_least_bits) {
   if (CpuFeatures::IsSupported(ARMv7)) {
     ubfx(dst, src, kSmiTagSize, num_least_bits);
   } else {
     mov(dst, Operand(src, ASR, kSmiTagSize));
     and_(dst, dst, Operand((1 << num_least_bits) - 1));
   }
 }
@@ skipping 297 matching lines @@
                      scratch2,
                      gc_required,
                      TAG_OBJECT);
 
   // Store heap number map in the allocated object.
   AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
   str(heap_number_map, FieldMemOperand(result, HeapObject::kMapOffset));
 }
 
 
+void MacroAssembler::AllocateHeapNumberWithValue(Register result,
+                                                 DwVfpRegister value,
+                                                 Register scratch1,
+                                                 Register scratch2,
+                                                 Register heap_number_map,
+                                                 Label* gc_required) {
+  AllocateHeapNumber(result, scratch1, scratch2, heap_number_map, gc_required);
+  sub(scratch1, result, Operand(kHeapObjectTag));
+  vstr(value, scratch1, HeapNumber::kValueOffset);
+}
+
+
 void MacroAssembler::CountLeadingZeros(Register zeros,   // Answer.
                                        Register source,  // Input.
                                        Register scratch) {
   ASSERT(!zeros.is(source) || !source.is(zeros));
   ASSERT(!zeros.is(scratch));
   ASSERT(!scratch.is(ip));
   ASSERT(!source.is(ip));
   ASSERT(!zeros.is(ip));
 #ifdef CAN_USE_ARMV5_INSTRUCTIONS
   clz(zeros, source);  // This instruction is only supported after ARM5.
@@ skipping 142 matching lines @@
 
 void CodePatcher::Emit(Address addr) {
   masm()->emit(reinterpret_cast<Instr>(addr));
 }
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM