Allow targets to inject passes before the virtual register rewriter.

Such passes can be used to tweak the register assignments in a
target-dependent way, for example to avoid write-after-write
dependencies.

llvm-svn: 159209

2 files changed, 17 insertions, 1 deletions

diff --git a/llvm/include/llvm/CodeGen/Passes.h b/llvm/include/llvm/CodeGen/Passes.h
index cc3b3d72356..206bc2e1236 100644
--- a/llvm/include/llvm/CodeGen/Passes.h
+++ b/llvm/include/llvm/CodeGen/Passes.h
@@ -175,6 +175,18 @@ protected:
   /// LLVMTargetMachine provides standard regalloc passes for most targets.
   virtual void addOptimizedRegAlloc(FunctionPass *RegAllocPass);
 
+  /// addPreRewrite - Add passes to the optimized register allocation pipeline
+  /// after register allocation is complete, but before virtual registers are
+  /// rewritten to physical registers.
+  ///
+  /// These passes must preserve VirtRegMap and LiveIntervals, and when running
+  /// after RABasic or RAGreedy, they should take advantage of LiveRegMatrix.
+  /// When these passes run, VirtRegMap contains legal physreg assignments for
+  /// all virtual registers.
+  virtual bool addPreRewrite() {
+    return false;
+  }
+
   /// addFinalizeRegAlloc - This method may be implemented by targets that want
   /// to run passes within the regalloc pipeline, immediately after the register
   /// allocation pass itself. These passes run as soon as virtual regisiters
diff --git a/llvm/lib/CodeGen/Passes.cpp b/llvm/lib/CodeGen/Passes.cpp
index b166dbe7432..bf244a55456 100644
--- a/llvm/lib/CodeGen/Passes.cpp
+++ b/llvm/lib/CodeGen/Passes.cpp
@@ -603,7 +603,11 @@ void TargetPassConfig::addOptimizedRegAlloc(FunctionPass *RegAllocPass) {
 
   // Add the selected register allocation pass.
   PM->add(RegAllocPass);
-  printAndVerify("After Register Allocation");
+  printAndVerify("After Register Allocation, before rewriter");
+
+  // Allow targets to change the register assignments before rewriting.
+  if (addPreRewrite())
+    printAndVerify("After pre-rewrite passes");
 
   // Finally rewrite virtual registers.
   addPass(VirtRegRewriterID);