Fix Double.pow() for arm and mips

runtime/vm/intermediate_language_mips.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_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 4562 matching lines @@
   __ cund(exp, exp);
   Label try_sqrt;
   __ bc1f(&try_sqrt);  // Neither 'exp' nor 'base' are NaN.
 
   __ Bind(&return_nan);
   __ LoadImmediate(result, NAN);
   __ b(&skip_call);
 
   __ Bind(&try_sqrt);
   // Before calling pow, check if we could use sqrt instead of pow.
-  __ LoadImmediate(result, kPosInfinity);
-  // base == Infinity -> call pow;
+  __ LoadImmediate(result, kNegInfinity);
+  // base == -Infinity -> call pow;
   __ ceqd(base, result);
   Label do_pow;
   __ bc1t(&do_pow);
 
   // exponent == 0.5 ?
   __ LoadImmediate(result, 0.5);
-  __ ceqd(base, result);
+  __ ceqd(exp, result);
   __ bc1f(&do_pow);
 
   // base == 0 -> return 0;
   __ LoadImmediate(DTMP, 0.0);
   __ ceqd(base, DTMP);
   Label return_zero;
   __ bc1t(&return_zero);
 
   __ sqrtd(result, base);
   __ b(&skip_call);
@@ skipping 1230 matching lines @@
                                 1,
                                 locs());
   __ lw(result, Address(SP, 1 * kWordSize));
   __ addiu(SP, SP, Immediate(2 * kWordSize));
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS