[PATCH] R600: Implement a few simple TTI queries.

[Matt Arsenault]

I'm not sure if these have any effect right now.

http://reviews.llvm.org/D4586

Files:
  lib/Target/R600/AMDGPUTargetTransformInfo.cpp

Index: lib/Target/R600/AMDGPUTargetTransformInfo.cpp
===================================================================
--- lib/Target/R600/AMDGPUTargetTransformInfo.cpp
+++ lib/Target/R600/AMDGPUTargetTransformInfo.cpp
@@ -91,6 +91,10 @@
 
   PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) const override;
 
+  unsigned getNumberOfRegisters(bool Vector) const override;
+  unsigned getRegisterBitWidth(bool Vector) const override;
+  unsigned getMaximumUnrollFactor() const override;
+
   /// @}
 };
 
@@ -162,3 +166,23 @@
   assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2");
   return ST->hasBCNT(TyWidth) ? PSK_FastHardware : PSK_Software;
 }
+
+unsigned AMDGPUTTI::getNumberOfRegisters(bool Vec) const {
+  if (Vec)
+    return 0;
+
+  // Number of VGPRs on SI.
+  if (ST->getGeneration() >= AMDGPUSubtarget::SOUTHERN_ISLANDS)
+    return 256;
+
+  return 4 * 128; // XXX - 4 channels. Should these count as vector instead?
+}
+
+unsigned AMDGPUTTI::getRegisterBitWidth(bool) const {
+  return 32;
+}
+
+unsigned AMDGPUTTI::getMaximumUnrollFactor() const {
+  // Semi-arbitrary large amount.
+  return 64;
+}
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