Convert BinadryDoubleOp to MathUnaryInstr double-square if both inputs are the same. Uses less regi…

runtime/vm/intermediate_language_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/intermediate_language.h"
 
 #include "vm/cpu.h"
@@ skipping 4719 matching lines @@
       break;
     case Token::kSUB:
       __ vsubqi(kWord, result, left, right);
       break;
     default: UNREACHABLE();
   }
 }
 
 
 LocationSummary* MathUnaryInstr::MakeLocationSummary(bool opt) const {
-  if ((kind() == MethodRecognizer::kMathSin) ||
-      (kind() == MethodRecognizer::kMathCos)) {
+  if ((kind() == MathUnaryInstr::kSin) || (kind() == MathUnaryInstr::kCos)) {
     const intptr_t kNumInputs = 1;
     const intptr_t kNumTemps = 0;
     LocationSummary* summary =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
     summary->set_in(0, Location::FpuRegisterLocation(Q0));
     summary->set_out(0, Location::FpuRegisterLocation(Q0));
 #if !defined(ARM_FLOAT_ABI_HARD)
     summary->AddTemp(Location::RegisterLocation(R0));
     summary->AddTemp(Location::RegisterLocation(R1));
     summary->AddTemp(Location::RegisterLocation(R2));
     summary->AddTemp(Location::RegisterLocation(R3));
 #endif
     return summary;
   }
-  // Sqrt.
+  ASSERT((kind() == MathUnaryInstr::kSqrt) ||
+         (kind() == MathUnaryInstr::kDoubleSquare));
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void MathUnaryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  if (kind() == MethodRecognizer::kMathSqrt) {
+  if (kind() == MathUnaryInstr::kSqrt) {
     DRegister val = EvenDRegisterOf(locs()->in(0).fpu_reg());
     DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
     __ vsqrtd(result, val);
+  } else if (kind() == MathUnaryInstr::kDoubleSquare) {
+    DRegister val = EvenDRegisterOf(locs()->in(0).fpu_reg());
+    DRegister result = EvenDRegisterOf(locs()->out(0).fpu_reg());
+    __ vmuld(result, val, val);
   } else {
+    ASSERT((kind() == MathUnaryInstr::kSin) ||
+           (kind() == MathUnaryInstr::kCos));
 #if defined(ARM_FLOAT_ABI_HARD)
     __ CallRuntime(TargetFunction(), InputCount());
 #else
     // If we aren't doing "hardfp", then we have to move the double arguments
     // to the integer registers, and take the results from the integer
     // registers.
     __ vmovrrd(R0, R1, D0);
     __ vmovrrd(R2, R3, D1);
     __ CallRuntime(TargetFunction(), InputCount());
     __ vmovdrr(D0, R0, R1);
@@ skipping 1294 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(ArgumentCount());  // Discard arguments.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM