Fixed power-of-2 predicates, excluding 0.

src/arm64/lithium-codegen-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
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 //
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@@ skipping 2618 matching lines @@
 
   Comment(";;; deoptimize: %s", instr->hydrogen()->reason());
   Deoptimize(instr->environment(), &type);
 }
 
 
 void LCodeGen::DoDivByPowerOf2I(LDivByPowerOf2I* instr) {
   Register dividend = ToRegister32(instr->dividend());
   int32_t divisor = instr->divisor();
   Register result = ToRegister32(instr->result());
-  ASSERT(divisor == kMinInt || (divisor != 0 && IsPowerOf2(Abs(divisor))));
+  ASSERT(divisor == kMinInt || IsPowerOf2(Abs(divisor)));
   ASSERT(!result.is(dividend));
 
   // Check for (0 / -x) that will produce negative zero.
   HDiv* hdiv = instr->hydrogen();
   if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) {
     __ Cmp(dividend, 0);
     DeoptimizeIf(eq, instr->environment());
   }
   // Check for (kMinInt / -1).
   if (hdiv->CheckFlag(HValue::kCanOverflow) && divisor == -1) {
@@ skipping 3297 matching lines @@
   __ Ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(deferred->exit());
   __ Bind(&done);
 }
 
 } }  // namespace v8::internal