Add StandardPasses.h which embeds the standard compilation passes shared by

clang/llvm-gcc.
 - Implemented as inline functions for linking simplicity.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72786 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/StandardPasses.h

@@ -0,0 +1,149 @@
+//===-- llvm/Support/StandardPasses.h - Standard pass lists -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines utility functions for creating a "standard" set of
+// optimization passes, so that compilers and tools which use optimization
+// passes use the same set of standard passes.
+//
+// These are implemented as inline functions so that we do not have to worry
+// about link issues.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_STANDARDPASSES_H
+#define LLVM_SUPPORT_STANDARDPASSES_H
+
+#include "llvm/PassManager.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/Transforms/IPO.h"
+
+namespace llvm {
+  /// createStandardFunctionPasses - Add the standard list of function passes to
+  /// the provided pass manager.
+  ///
+  /// \arg OptimizationLevel - The optimization level, corresponding to -O0,
+  /// -O1, etc.
+  static inline void createStandardFunctionPasses(FunctionPassManager *PM,
+                                                  unsigned OptimizationLevel);
+
+  /// createStandardModulePasses - Add the standard list of module passes to the
+  /// provided pass manager.
+  ///
+  /// \arg OptimizationLevel - The optimization level, corresponding to -O0,
+  /// -O1, etc.
+  /// \arg OptimizeSize - Whether the transformations should optimize for size.
+  /// \arg UnitAtATime - Allow passes which may make global module changes.
+  /// \arg UnrollLoops - Allow loop unrolling.
+  /// \arg SimplifyLibCalls - Allow library calls to be simplified.
+  /// \arg HaveExceptions - Whether the module may have code using exceptions.
+  /// \arg InliningPass - The inlining pass to use, if any, or null. This will
+  /// always be added, even at -O0.a
+  static inline void createStandardModulePasses(PassManager *PM,
+                                                unsigned OptimizationLevel,
+                                                bool OptimizeSize,
+                                                bool UnitAtATime,
+                                                bool UnrollLoops,
+                                                bool SimplifyLibCalls,
+                                                bool HaveExceptions,
+                                                Pass *InliningPass);
+
+  // Implementations
+
+  static inline void createStandardFunctionPasses(FunctionPassManager *PM,
+                                                  unsigned OptimizationLevel) {
+    if (OptimizationLevel > 0) {
+      PM->add(createCFGSimplificationPass());
+      if (OptimizationLevel == 1)
+        PM->add(createPromoteMemoryToRegisterPass());
+      else
+        PM->add(createScalarReplAggregatesPass());
+      PM->add(createInstructionCombiningPass());
+    }
+  }
+
+  static inline void createStandardModulePasses(PassManager *PM,
+                                                unsigned OptimizationLevel,
+                                                bool OptimizeSize,
+                                                bool UnitAtATime,
+                                                bool UnrollLoops,
+                                                bool SimplifyLibCalls,
+                                                bool HaveExceptions,
+                                                Pass *InliningPass) {
+    if (OptimizationLevel == 0) {
+      if (InliningPass)
+        PM->add(InliningPass);
+    } else {
+      if (UnitAtATime)
+        PM->add(createRaiseAllocationsPass());    // call %malloc -> malloc inst
+      PM->add(createCFGSimplificationPass());     // Clean up disgusting code
+       // Kill useless allocas
+      PM->add(createPromoteMemoryToRegisterPass());
+      if (UnitAtATime) {
+        PM->add(createGlobalOptimizerPass());     // Optimize out global vars
+        PM->add(createGlobalDCEPass());           // Remove unused fns and globs
+        // IP Constant Propagation
+        PM->add(createIPConstantPropagationPass());
+        PM->add(createDeadArgEliminationPass());  // Dead argument elimination
+      }
+      PM->add(createInstructionCombiningPass());  // Clean up after IPCP & DAE
+      PM->add(createCFGSimplificationPass());     // Clean up after IPCP & DAE
+      if (UnitAtATime) {
+        if (HaveExceptions)
+          PM->add(createPruneEHPass());           // Remove dead EH info
+        PM->add(createFunctionAttrsPass());       // Set readonly/readnone attrs
+      }
+      if (InliningPass)
+        PM->add(InliningPass);
+      if (OptimizationLevel > 2)
+        PM->add(createArgumentPromotionPass());   // Scalarize uninlined fn args
+      if (SimplifyLibCalls)
+        PM->add(createSimplifyLibCallsPass());    // Library Call Optimizations
+      PM->add(createInstructionCombiningPass());  // Cleanup for scalarrepl.
+      PM->add(createJumpThreadingPass());         // Thread jumps.
+      PM->add(createCFGSimplificationPass());     // Merge & remove BBs
+      PM->add(createScalarReplAggregatesPass());  // Break up aggregate allocas
+      PM->add(createInstructionCombiningPass());  // Combine silly seq's
+      PM->add(createCondPropagationPass());       // Propagate conditionals
+      PM->add(createTailCallEliminationPass());   // Eliminate tail calls
+      PM->add(createCFGSimplificationPass());     // Merge & remove BBs
+      PM->add(createReassociatePass());           // Reassociate expressions
+      PM->add(createLoopRotatePass());            // Rotate Loop
+      PM->add(createLICMPass());                  // Hoist loop invariants
+      PM->add(createLoopUnswitchPass(OptimizeSize ? true : false));
+      PM->add(createLoopIndexSplitPass());        // Split loop index
+      PM->add(createInstructionCombiningPass());  
+      PM->add(createIndVarSimplifyPass());        // Canonicalize indvars
+      PM->add(createLoopDeletionPass());          // Delete dead loops
+      if (UnrollLoops)
+        PM->add(createLoopUnrollPass());          // Unroll small loops
+      PM->add(createInstructionCombiningPass());  // Clean up after the unroller
+      PM->add(createGVNPass());                   // Remove redundancies
+      PM->add(createMemCpyOptPass());             // Remove memcpy / form memset
+      PM->add(createSCCPPass());                  // Constant prop with SCCP
+    
+      // Run instcombine after redundancy elimination to exploit opportunities
+      // opened up by them.
+      PM->add(createInstructionCombiningPass());
+      PM->add(createCondPropagationPass());       // Propagate conditionals
+      PM->add(createDeadStoreEliminationPass());  // Delete dead stores
+      PM->add(createAggressiveDCEPass());         // Delete dead instructions
+      PM->add(createCFGSimplificationPass());     // Merge & remove BBs
+
+      if (UnitAtATime) {
+        PM->add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
+        PM->add(createDeadTypeEliminationPass()); // Eliminate dead types
+      }
+
+      if (OptimizationLevel > 1 && UnitAtATime)
+        PM->add(createConstantMergePass());       // Merge dup global constants
+    }
+  }
+}
+
+#endif