Go through all kinds of trouble to mark 'blr' as having a predicate operand

that takes a register and condition code.  Print these pieces of BLR the
right way, even though it is currently set to 'always'.

Next up: get the JIT encoding right, then enhance branch folding to produce
predicated blr for simple examples.

llvm-svn: 31449

1 files changed, 23 insertions, 8 deletions

diff --git a/llvm/lib/Target/PowerPC/PPC.h b/llvm/lib/Target/PowerPC/PPC.h
index 8fef9662010..c8ea2829c46 100644
--- a/llvm/lib/Target/PowerPC/PPC.h
+++ b/llvm/lib/Target/PowerPC/PPC.h
@@ -17,13 +17,31 @@
 
 #include <iosfwd>
 
-namespace llvm {
 
-class PPCTargetMachine;
-class FunctionPassManager;
-class FunctionPass;
-class MachineCodeEmitter;
+// GCC #defines PPC on Linux but we use it as our namespace name
+#undef PPC
 
+namespace llvm {
+  class PPCTargetMachine;
+  class FunctionPassManager;
+  class FunctionPass;
+  class MachineCodeEmitter;
+  
+  namespace PPC {
+    /// Predicate - These are "(BO << 5) | BI"  for various predicates.
+    enum Predicate {
+      PRED_ALWAYS = (20 << 5) | 0,
+      PRED_LT     = (12 << 5) | 0,
+      PRED_LE     = ( 4 << 5) | 1,
+      PRED_EQ     = (12 << 5) | 2,
+      PRED_GE     = ( 4 << 5) | 0,
+      PRED_GT     = (12 << 5) | 1,
+      PRED_NE     = ( 4 << 5) | 2,
+      PRED_UN     = (12 << 5) | 3,
+      PRED_NU     = ( 4 << 5) | 3
+    };
+  }
+  
 FunctionPass *createPPCBranchSelectionPass();
 FunctionPass *createPPCISelDag(PPCTargetMachine &TM);
 FunctionPass *createPPCAsmPrinterPass(std::ostream &OS,
@@ -34,9 +52,6 @@ void addPPCMachOObjectWriterPass(FunctionPassManager &FPM, std::ostream &o,
                                  PPCTargetMachine &tm);
 } // end namespace llvm;
 
-// GCC #defines PPC on Linux but we use it as our namespace name
-#undef PPC
-
 // Defines symbolic names for PowerPC registers.  This defines a mapping from
 // register name to register number.
 //