Fixed modulo by a power of 2 on A64.

src/a64/lithium-codegen-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4121 matching lines @@
   // version performs better.
   HMod* hmod = instr->hydrogen();
   int32_t mask = divisor < 0 ? -(divisor + 1) : (divisor - 1);
   Label dividend_is_not_negative, done;
   if (hmod->CheckFlag(HValue::kLeftCanBeNegative)) {
     __ Cmp(dividend, 0);
     __ B(pl, &dividend_is_not_negative);
     // Note that this is correct even for kMinInt operands.
     __ Neg(dividend, dividend);
     __ And(dividend, dividend, Operand(mask));
-    __ Neg(dividend, dividend);
+    __ Negs(dividend, dividend);
     if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
       DeoptimizeIf(eq, instr->environment());
     }
     __ B(&done);
   }
 
   __ bind(&dividend_is_not_negative);
   __ And(dividend, dividend, Operand(mask));
   __ bind(&done);
 }
@@ skipping 1683 matching lines @@
   __ Bind(&out_of_object);
   __ 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(&done);
 }
 
 } }  // namespace v8::internal