Added option -align-loops=<true/false> to disable loop aligner pass.

llvm-svn: 47736

lib/CodeGen/LLVMTargetMachine.cpp

@@ -37,6 +37,9 @@ static cl::opt<bool>
 EnableSinking("enable-sinking", cl::init(false), cl::Hidden,
               cl::desc("Perform sinking on machine code"));
 static cl::opt<bool>
+AlignLoops("align-loops", cl::init(true), cl::Hidden,
+              cl::desc("Align loop headers"));
+static cl::opt<bool>
 PerformLICM("machine-licm",
             cl::init(false), cl::Hidden,
             cl::desc("Perform loop-invariant code motion on machine code"));
@@ -132,6 +135,9 @@ LLVMTargetMachine::addPassesToEmitFile(FunctionPassManager &PM,
   if (addPreEmitPass(PM, Fast) && PrintMachineCode)
     PM.add(createMachineFunctionPrinterPass(cerr));
 
+  if (AlignLoops)
+    PM.add(createLoopAlignerPass());
+
   switch (FileType) {
   default:
     break;

lib/CodeGen/LoopAligner.cpp

@@ -18,6 +18,7 @@
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/Target/TargetLowering.h"
 #include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
 using namespace llvm;

lib/Target/X86/X86TargetMachine.cpp

@@ -164,13 +164,6 @@ bool X86TargetMachine::addPostRegAlloc(FunctionPassManager &PM, bool Fast) {
   return true;  // -print-machineinstr should print after this.
 }
 
-bool X86TargetMachine::addPreEmitPass(FunctionPassManager &PM, bool Fast) {
-  if (Fast) return false;
-
-  PM.add(createLoopAlignerPass());
-  return true;
-}
-
 bool X86TargetMachine::addAssemblyEmitter(FunctionPassManager &PM, bool Fast, 
                                           std::ostream &Out) {
   PM.add(createX86CodePrinterPass(Out, *this));

lib/Target/X86/X86TargetMachine.h

@@ -63,7 +63,6 @@ public:
   // Set up the pass pipeline.
   virtual bool addInstSelector(FunctionPassManager &PM, bool Fast);  
   virtual bool addPostRegAlloc(FunctionPassManager &PM, bool Fast);
-  virtual bool addPreEmitPass(FunctionPassManager &PM, bool Fast);
   virtual bool addAssemblyEmitter(FunctionPassManager &PM, bool Fast, 
                                   std::ostream &Out);
   virtual bool addCodeEmitter(FunctionPassManager &PM, bool Fast,