Add optimization for pow(base, 0.5) to the other architectures as well.

runtime/vm/intermediate_language_ia32.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_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 4760 matching lines @@
     // if (base != -Infinity && exponent == 0.5) {
     //   if (base == 0.0) return 0.0;
     //   return sqrt(value);
     // }
     XmmRegister base = locs()->in(0).fpu_reg();
     XmmRegister exp = locs()->in(1).fpu_reg();
     XmmRegister result = locs()->out(0).fpu_reg();
     Register temp = locs()->temp(kObjectTempIndex).reg();
     XmmRegister zero_temp = locs()->temp(kDoubleTempIndex).fpu_reg();
 
-    Label do_call, check_base, return_nan;
+    Label try_sqrt, check_base, return_nan;
     __ LoadObject(temp, Double::ZoneHandle(Double::NewCanonical(0)));
     __ movsd(zero_temp, FieldAddress(temp, Double::value_offset()));
     __ LoadObject(temp, Double::ZoneHandle(Double::NewCanonical(1)));
     __ movsd(result, FieldAddress(temp, Double::value_offset()));
 
     // exponent == 0.0 -> return 1.0;
     __ comisd(exp, zero_temp);
     __ j(PARITY_EVEN, &check_base, Assembler::kNearJump);
     __ j(EQUAL, &skip_call, Assembler::kNearJump);  // 'result' is 1.0.
 
     __ Bind(&check_base);
     // Note: 'exp' could be NaN.
 
     // base == 1.0 -> return 1.0;
     __ comisd(base, result);
     __ j(PARITY_EVEN, &return_nan, Assembler::kNearJump);
     __ j(EQUAL, &skip_call, Assembler::kNearJump);
     // Note: 'base' could be NaN.
     __ comisd(exp, base);
     // Neither 'exp' nor 'base' is NaN.
-    __ j(PARITY_ODD, &do_call, Assembler::kNearJump);
+    __ j(PARITY_ODD, &try_sqrt, Assembler::kNearJump);
     // Return NaN.
     __ Bind(&return_nan);
     __ LoadObject(temp, Double::ZoneHandle(Double::NewCanonical(NAN)));
     __ movsd(result, FieldAddress(temp, Double::value_offset()));
     __ jmp(&skip_call);
 
     Label do_pow, return_zero;
-    __ Bind(&do_call);
-    // Before calling check if we could use sqrt instead of pow.
+    __ Bind(&try_sqrt);
+    // Before calling pow, check if we could use sqrt instead of pow.
     __ LoadObject(temp, Double::ZoneHandle(Double::NewCanonical(-INFINITY)));
     __ movsd(result, FieldAddress(temp, Double::value_offset()));
     // base == -Infinity -> call pow;
     __ comisd(base, result);
     __ j(EQUAL, &do_pow, Assembler::kNearJump);
 
     // exponent == 0.5 ?
     __ LoadObject(temp, Double::ZoneHandle(Double::NewCanonical(0.5)));
     __ movsd(result, FieldAddress(temp, Double::value_offset()));
     __ comisd(exp, result);
@@ skipping 1017 matching lines @@
                          PcDescriptors::kOther,
                          locs());
   __ Drop(ArgumentCount());  // Discard arguments.
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_IA32