Combine allocas

src/IceTargetLoweringX8632.cpp

 //===- subzero/src/IceTargetLoweringX8632.cpp - x86-32 lowering -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 133 matching lines @@
       XmmArgs.push_back(Arg);
     } else {
       StackArgs.push_back(Arg);
       if (isVectorType(Arg->getType())) {
         ParameterAreaSizeBytes =
             Traits::applyStackAlignment(ParameterAreaSizeBytes);
       }
       Variable *esp =
           Func->getTarget()->getPhysicalRegister(Traits::RegisterSet::Reg_esp);
       Constant *Loc = Ctx->getConstantInt32(ParameterAreaSizeBytes);
-      StackArgLocations.push_back(
-          Traits::X86OperandMem::create(Func, Ty, esp, Loc));
+      auto *Mem = Traits::X86OperandMem::create(Func, Ty, esp, Loc);
+      // Stack stores for arguments are fixed to esp.
+      Mem->setIgnoreStackAdjust(true);
+      StackArgLocations.push_back(Mem);
       ParameterAreaSizeBytes += typeWidthInBytesOnStack(Arg->getType());
     }
   }
 
   // Adjust the parameter area so that the stack is aligned. It is assumed that
   // the stack is already aligned at the start of the calling sequence.
   ParameterAreaSizeBytes = Traits::applyStackAlignment(ParameterAreaSizeBytes);
 
   // Subtract the appropriate amount for the argument area. This also takes
   // care of setting the stack adjustment during emission.
@@ skipping 806 matching lines @@
 // case the high-level table has extra entries.
 #define X(tag, sizeLog2, align, elts, elty, str)                               \
   static_assert(_table1_##tag == _table2_##tag,                                \
                 "Inconsistency between ICETYPEX8632_TABLE and ICETYPE_TABLE");
 ICETYPE_TABLE
 #undef X
 } // end of namespace dummy3
 } // end of anonymous namespace
 
 } // end of namespace Ice