[llvm-commits] [llvm] r159209 - in /llvm/trunk: include/llvm/CodeGen/Passes.h lib/CodeGen/Passes.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Tue Jun 26 12:09:29 2012
New Revision: 159209

URL: http://llvm.org/viewvc/llvm-project?rev=159209&view=rev
Log:
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.

Modified:
    llvm/trunk/include/llvm/CodeGen/Passes.h
    llvm/trunk/lib/CodeGen/Passes.cpp

Modified: llvm/trunk/include/llvm/CodeGen/Passes.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/Passes.h?rev=159209&r1=159208&r2=159209&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/Passes.h (original)
+++ llvm/trunk/include/llvm/CodeGen/Passes.h Tue Jun 26 12:09:29 2012
@@ -175,6 +175,18 @@
   /// 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

Modified: llvm/trunk/lib/CodeGen/Passes.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/Passes.cpp?rev=159209&r1=159208&r2=159209&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/Passes.cpp (original)
+++ llvm/trunk/lib/CodeGen/Passes.cpp Tue Jun 26 12:09:29 2012
@@ -603,7 +603,11 @@
 
   // 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);