MIPS: Fix ambiguous double constant loading after adding checked load/store operators.

src/mips/code-stubs-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 826 matching lines @@
                        scratch2,
                        kCheckForInexactConversion);
     // scratch2 == 0 means there was no conversion error.
     __ Branch(&int_exponent_convert, eq, scratch2, Operand(zero_reg));
 
     if (exponent_type() == ON_STACK) {
       // Detect square root case.  Crankshaft detects constant +/-0.5 at
       // compile time and uses DoMathPowHalf instead.  We then skip this check
       // for non-constant cases of +/-0.5 as these hardly occur.
       Label not_plus_half;
-
       // Test for 0.5.
       __ Move(double_scratch, 0.5);
       __ BranchF(USE_DELAY_SLOT,
                  &not_plus_half,
                  NULL,
                  ne,
                  double_exponent,
                  double_scratch);
       // double_scratch can be overwritten in the delay slot.
       // Calculates square root of base.  Check for the special case of
       // Math.pow(-Infinity, 0.5) == Infinity (ECMA spec, 15.8.2.13).
-      __ Move(double_scratch, -V8_INFINITY);
+      __ Move(double_scratch, static_cast<double>(-V8_INFINITY));
       __ BranchF(USE_DELAY_SLOT, &done, NULL, eq, double_base, double_scratch);
       __ neg_d(double_result, double_scratch);
 
       // Add +0 to convert -0 to +0.
       __ add_d(double_scratch, double_base, kDoubleRegZero);
       __ sqrt_d(double_result, double_scratch);
       __ jmp(&done);
 
       __ bind(&not_plus_half);
       __ Move(double_scratch, -0.5);
       __ BranchF(USE_DELAY_SLOT,
                  &call_runtime,
                  NULL,
                  ne,
                  double_exponent,
                  double_scratch);
       // double_scratch can be overwritten in the delay slot.
       // Calculates square root of base.  Check for the special case of
       // Math.pow(-Infinity, -0.5) == 0 (ECMA spec, 15.8.2.13).
-      __ Move(double_scratch, -V8_INFINITY);
+      __ Move(double_scratch, static_cast<double>(-V8_INFINITY));
       __ BranchF(USE_DELAY_SLOT, &done, NULL, eq, double_base, double_scratch);
       __ Move(double_result, kDoubleRegZero);
 
       // Add +0 to convert -0 to +0.
       __ add_d(double_scratch, double_base, kDoubleRegZero);
       __ Move(double_result, 1.);
       __ sqrt_d(double_scratch, double_scratch);
       __ div_d(double_result, double_result, double_scratch);
       __ jmp(&done);
     }
@@ skipping 4042 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS