New header file to replace all of the Scalar/*.h files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2533 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Scalar.h

@@ -0,0 +1,120 @@
+//===-- Scalar.h - Scalar Transformations ------------------------*- C++ -*-==//
+//
+// This header file defines prototypes for accessor functions that expose passes
+// in the Scalar transformations library.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_SCALAR_H
+#define LLVM_TRANSFORMS_SCALAR_H
+
+class Pass;
+
+//===----------------------------------------------------------------------===//
+//
+// Constant Propogation Pass - A worklist driven constant propogation pass
+//
+Pass *createConstantPropogationPass();
+
+
+//===----------------------------------------------------------------------===//
+//
+// Sparse Conditional Constant Propogation Pass
+//
+Pass *createSCCPPass();
+
+
+//===----------------------------------------------------------------------===//
+//
+// DeadInstElimination - This pass quickly removes trivially dead instructions
+// without modifying the CFG of the function.  It is a BasicBlockPass, so it
+// runs efficiently when queued next to other BasicBlockPass's.
+//
+Pass *createDeadInstEliminationPass();
+
+
+//===----------------------------------------------------------------------===//
+//
+// DeadCodeElimination - This pass is more powerful than DeadInstElimination,
+// because it is worklist driven that can potentially revisit instructions when
+// their other instructions become dead, to eliminate chains of dead
+// computations.
+//
+Pass *createDeadCodeEliminationPass();
+
+
+//===----------------------------------------------------------------------===//
+//
+// AgressiveDCE - This pass uses the SSA based Agressive DCE algorithm.  This
+// algorithm assumes instructions are dead until proven otherwise, which makes
+// it more successful are removing non-obviously dead instructions.
+//
+Pass *createAgressiveDCEPass();
+
+
+//===----------------------------------------------------------------------===//
+// 
+// DecomposeMultiDimRefs - Convert multi-dimensional references consisting of
+// any combination of 2 or more array and structure indices into a sequence of
+// instructions (using getelementpr and cast) so that each instruction has at
+// most one index (except structure references, which need an extra leading
+// index of [0]).
+//
+Pass *createDecomposeMultiDimRefsPass();
+
+
+//===----------------------------------------------------------------------===//
+//
+// GCSE - This pass is designed to be a very quick global transformation that
+// eliminates global common subexpressions from a function.  It does this by
+// examining the SSA value graph of the function, instead of doing slow
+// bit-vector computations.
+//
+Pass *createGCSEPass();
+
+
+//===----------------------------------------------------------------------===//
+//
+// InductionVariableSimplify - Transform induction variables in a program to all
+// use a single cannonical induction variable per loop.
+//
+Pass *createIndVarSimplifyPass();
+
+
+//===----------------------------------------------------------------------===//
+//
+// InstructionCombining - Combine instructions to form fewer, simple
+//   instructions.  This pass does not modify the CFG, and has a tendancy to
+//   make instructions dead, so a subsequent DCE pass is useful.
+//
+// This pass combines things like:
+//    %Y = add int 1, %X
+//    %Z = add int 1, %Y
+// into:
+//    %Z = add int 2, %X
+//
+Pass *createInstructionCombiningPass();
+
+
+//===----------------------------------------------------------------------===//
+//
+// This pass is used to promote memory references to be register references.  A
+// simple example of the transformation performed by this pass is:
+//
+//        FROM CODE                           TO CODE
+//   %X = alloca int, uint 1                 ret int 42
+//   store int 42, int *%X
+//   %Y = load int* %X
+//   ret int %Y
+//
+Pass *createPromoteMemoryToRegister();
+
+
+//===----------------------------------------------------------------------===//
+//
+// These functions removes symbols from functions and modules.
+//
+Pass *createSymbolStrippingPass();
+Pass *createFullSymbolStrippingPass();
+
+#endif