PPC/s390: [arm] Fix infinite loop in Math.pow(2,2147483648).

src/s390/code-stubs-s390.cc

 // Copyright 2014 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.
 
 #if V8_TARGET_ARCH_S390
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 758 matching lines @@
   __ LoadComplementRR(scratch, scratch);
   __ bind(&positive_exponent);
 
   Label while_true, no_carry, loop_end;
   __ bind(&while_true);
   __ mov(scratch2, Operand(1));
   __ AndP(scratch2, scratch);
   __ beq(&no_carry, Label::kNear);
   __ mdbr(double_result, double_scratch);
   __ bind(&no_carry);
-  __ ShiftRightArithP(scratch, scratch, Operand(1));
+  __ ShiftRightP(scratch, scratch, Operand(1));
+  __ LoadAndTestP(scratch, scratch);
   __ beq(&loop_end, Label::kNear);
   __ mdbr(double_scratch, double_scratch);
   __ b(&while_true);
   __ bind(&loop_end);
 
   __ CmpP(exponent, Operand::Zero());
   __ bge(&done);
 
   // get 1/double_result:
   __ ldr(double_scratch, double_result);
@@ skipping 4601 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            kStackUnwindSpace, NULL, return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390