ARM: Add a postRA pass to legalize stack offsets. Greedy approach (reserve IP).

src/IceClFlags.cpp

 //===- subzero/src/IceClFlags.cpp - Command line flags and parsing --------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 127 matching lines @@
         clEnumValN(Ice::Target_X8632, "x86_32", "x86-32 (same as x8632)"),
         clEnumValN(Ice::Target_X8664, "x8664", "x86-64"),
         clEnumValN(Ice::Target_X8664, "x86-64", "x86-64 (same as x8664)"),
         clEnumValN(Ice::Target_X8664, "x86_64", "x86-64 (same as x8664)"),
         clEnumValN(Ice::Target_ARM32, "arm", "arm32"),
         clEnumValN(Ice::Target_ARM32, "arm32", "arm32 (same as arm)"),
         clEnumValN(Ice::Target_ARM64, "arm64", "arm64"),
         clEnumValN(Ice::Target_MIPS32, "mips", "mips32"),
         clEnumValN(Ice::Target_MIPS32, "mips32", "mips32 (same as mips)"),
         clEnumValEnd));
+
+cl::opt<uint32_t> TestStackExtra(
+    "test-stack-extra",
+    cl::desc(
+        "Extra amount of stack to add to the frame in bytes (for testing)."),
+    cl::init(0));
+
 cl::opt<Ice::TargetInstructionSet> TargetInstructionSet(
     "mattr", cl::desc("Target architecture attributes"),
     cl::init(Ice::BaseInstructionSet),
     cl::values(clEnumValN(Ice::BaseInstructionSet, "base",
                           "Target chooses baseline instruction set (default)"),
                clEnumValN(Ice::X86InstructionSet_SSE2, "sse2",
                           "Enable X86 SSE2 instructions"),
                clEnumValN(Ice::X86InstructionSet_SSE4_1, "sse4.1",
                           "Enable X86 SSE 4.1 instructions"),
                clEnumValN(Ice::ARM32InstructionSet_Neon, "neon",
@@ skipping 197 matching lines @@
   OutFlags.UseSandboxing = false;
   // Enum and integer fields.
   OutFlags.Opt = Opt_m1;
   OutFlags.OutFileType = FT_Iasm;
   OutFlags.RandomMaxNopsPerInstruction = 0;
   OutFlags.RandomNopProbabilityAsPercentage = 0;
   OutFlags.RandomizeAndPoolImmediatesOption = RPI_None;
   OutFlags.RandomizeAndPoolImmediatesThreshold = 0xffff;
   OutFlags.ReorderFunctionsWindowSize = 8;
   OutFlags.TArch = TargetArch_NUM;
+  OutFlags.TestStackExtra = 0;
   OutFlags.VMask = IceV_None;
   // IceString fields.
   OutFlags.DefaultFunctionPrefix = "";
   OutFlags.DefaultGlobalPrefix = "";
   OutFlags.TestPrefix = "";
   OutFlags.TimingFocusOn = "";
   OutFlags.TranslateOnly = "";
   OutFlags.VerboseFocusOn = "";
   // size_t and 64-bit fields.
   OutFlags.NumTranslationThreads = 0;
@@ skipping 36 matching lines @@
     OutFlags.setPhiEdgeSplit(::EnablePhiEdgeSplit);
   }
   OutFlags.setRandomSeed(::RandomSeed);
   OutFlags.setShouldDoNopInsertion(::ShouldDoNopInsertion);
   OutFlags.setShouldRandomizeRegAlloc(::RandomizeRegisterAllocation);
   OutFlags.setSkipUnimplemented(::SkipUnimplemented);
   OutFlags.setSubzeroTimingEnabled(::SubzeroTimingEnabled);
   OutFlags.setTargetArch(::TargetArch);
   OutFlags.setTargetInstructionSet(::TargetInstructionSet);
   OutFlags.setTestPrefix(::TestPrefix);
+  OutFlags.setTestStackExtra(::TestStackExtra);
   OutFlags.setTimeEachFunction(::TimeEachFunction);
   OutFlags.setTimingFocusOn(::TimingFocusOn);
   OutFlags.setTranslateOnly(::TranslateOnly);
   OutFlags.setUseAdvancedSwitchLowering(::UseAdvancedSwitchLowering);
   OutFlags.setUseSandboxing(::UseSandboxing);
   OutFlags.setVerboseFocusOn(::VerboseFocusOn);
   OutFlags.setOutFileType(::OutFileType);
   OutFlags.setMaxNopsPerInstruction(::MaxNopsPerInstruction);
   OutFlags.setNopProbabilityAsPercentage(::NopProbabilityAsPercentage);
   OutFlags.setVerbose(VMask);
@@ skipping 22 matching lines @@
   OutFlagsExtra.setGenerateBuildAtts(GenerateBuildAtts);
   OutFlagsExtra.setLLVMVerboseErrors(LLVMVerboseErrors);
   OutFlagsExtra.setAppName(AppName);
   OutFlagsExtra.setInputFileFormat(InputFileFormat);
   OutFlagsExtra.setIRFilename(IRFilename);
   OutFlagsExtra.setLogFilename(LogFilename);
   OutFlagsExtra.setOutputFilename(OutputFilename);
 }
 
 } // end of namespace Ice