New array bounds check elimination pass (focused on induction variables and bitwise operations).

src/mips/lithium-codegen-mips.cc

 // Copyright 2012 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 4164 matching lines @@
   Handle<Code> ic = (instr->strict_mode_flag() == kStrictMode)
       ? isolate()->builtins()->StoreIC_Initialize_Strict()
       : isolate()->builtins()->StoreIC_Initialize();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoBoundsCheck(LBoundsCheck* instr) {
   if (instr->hydrogen()->skip_check()) return;
 
+  Condition condition = instr->hydrogen()->allow_equality() ? hi : hs;
   if (instr->index()->IsConstantOperand()) {
     int constant_index =
         ToInteger32(LConstantOperand::cast(instr->index()));
     if (instr->hydrogen()->length()->representation().IsSmi()) {
       __ li(at, Operand(Smi::FromInt(constant_index)));
     } else {
       __ li(at, Operand(constant_index));
     }
-    DeoptimizeIf(hs,
+    DeoptimizeIf(condition,
                  instr->environment(),
                  at,
                  Operand(ToRegister(instr->length())));
   } else {
-    DeoptimizeIf(hs,
+    DeoptimizeIf(condition,
                  instr->environment(),
                  ToRegister(instr->index()),
                  Operand(ToRegister(instr->length())));
   }
 }
 
 
 void LCodeGen::DoStoreKeyedExternalArray(LStoreKeyed* instr) {
   Register external_pointer = ToRegister(instr->elements());
   Register key = no_reg;
@@ skipping 1612 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal