Allow machine LICM to do its job on SPU.

-return a sensible value for register pressure
-add pattern to 'ila' instrucion


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120285 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/Target/CellSPU/SPUISelLowering.h b/lib/Target/CellSPU/SPUISelLowering.h
index 82f10270db..95d44afe37 100644
--- a/lib/Target/CellSPU/SPUISelLowering.h
+++ b/lib/Target/CellSPU/SPUISelLowering.h
@@ -181,6 +181,14 @@ namespace llvm {
 
     virtual bool isLegalAddressingMode(const AddrMode &AM, 
                                        const Type *Ty) const;
+ 
+    /// After allocating this many registers, the allocator should feel
+    /// register pressure. The value is a somewhat random guess, based on the
+    /// number of non callee saved registers in the C calling convention.
+    virtual unsigned getRegPressureLimit( const TargetRegisterClass *RC,
+                                          MachineFunction &MF) const{
+      return 50;
+    }
   };
 }