MIPS: Remove the first_right_arg hack for HMod.

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 1073 matching lines @@
       if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
         DeoptimizeIf(eq, instr->environment(), result_reg, Operand(zero_reg));
       }
       __ Branch(USE_DELAY_SLOT, &done);
       __ subu(result_reg, zero_reg, result_reg);
     }
 
     __ bind(&left_is_not_negative);
     __ And(result_reg, left_reg, divisor - 1);
     __ bind(&done);
-
-  } else if (hmod->fixed_right_arg().has_value) {
-    const Register left_reg = ToRegister(instr->left());
-    const Register result_reg = ToRegister(instr->result());
-    const Register right_reg = ToRegister(instr->right());
-
-    int32_t divisor = hmod->fixed_right_arg().value;
-    ASSERT(IsPowerOf2(divisor));
-
-    // Check if our assumption of a fixed right operand still holds.
-    DeoptimizeIf(ne, instr->environment(), right_reg, Operand(divisor));
-
-    Label left_is_not_negative, done;
-    if (left->CanBeNegative()) {
-      __ Branch(left_reg.is(result_reg) ? PROTECT : USE_DELAY_SLOT,
-                &left_is_not_negative, ge, left_reg, Operand(zero_reg));
-      __ subu(result_reg, zero_reg, left_reg);
-      __ And(result_reg, result_reg, divisor - 1);
-      if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
-        DeoptimizeIf(eq, instr->environment(), result_reg, Operand(zero_reg));
-      }
-      __ Branch(USE_DELAY_SLOT, &done);
-      __ subu(result_reg, zero_reg, result_reg);
-    }
-
-    __ bind(&left_is_not_negative);
-    __ And(result_reg, left_reg, divisor - 1);
-    __ bind(&done);
-
   } else {
     const Register scratch = scratch0();
     const Register left_reg = ToRegister(instr->left());
     const Register result_reg = ToRegister(instr->result());
 
     // div runs in the background while we check for special cases.
     Register right_reg = EmitLoadRegister(instr->right(), scratch);
     __ div(left_reg, right_reg);
 
     Label done;
@@ skipping 4781 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal