radeon/llvm: Use the VLIW Scheduler for R600->NI

It's not optimal, but it's better than the register pressure scheduler
that was previously being used.  The VLIW scheduler currently ignores
all the complicated instruction groups restrictions and just tries to
fill the instruction groups with as many instructions as possible.
Though, it does know enough not to put two trans only instructions in
the same group.

We are able to ignore the instruction group restrictions in the LLVM
backend, because the finalizer in r600_asm.c will fix any illegal
instruction groups the backend generates.

Enabling the VLIW scheduler improved the run time for a sha1 compute
shader by about 50%.  I'm not sure what the impact will be for graphics
shaders.  I tested Lightsmark with the VLIW scheduler enabled and the
framerate was about the same, but it might help apps that use really
big shaders.

1 files changed, 36 insertions, 0 deletions

diff --git a/src/gallium/drivers/radeon/AMDGPUSubtarget.h b/src/gallium/drivers/radeon/AMDGPUSubtarget.h
new file mode 100644
index 00000000000..96ace88b476
--- /dev/null
+++ b/src/gallium/drivers/radeon/AMDGPUSubtarget.h
@@ -0,0 +1,36 @@
+//=====-- AMDGPUSubtarget.h - Define Subtarget for the AMDIL ---*- C++ -*-====//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//==-----------------------------------------------------------------------===//
+//
+// This file declares the AMDGPU specific subclass of TargetSubtarget.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _AMDGPUSUBTARGET_H_
+#define _AMDGPUSUBTARGET_H_
+#include "AMDILSubtarget.h"
+
+namespace llvm {
+
+class AMDGPUSubtarget : public AMDILSubtarget
+{
+  InstrItineraryData InstrItins;
+
+public:
+  AMDGPUSubtarget(StringRef TT, StringRef CPU, StringRef FS) :
+    AMDILSubtarget(TT, CPU, FS)
+  {
+    InstrItins = getInstrItineraryForCPU(CPU);
+  }
+
+  const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
+};
+
+} // End namespace llvm
+
+#endif // AMDGPUSUBTARGET_H_