R600: Implement TTI:getPopcntSupport

The test is just copied from X86, and I don't know of a better
way to test it.

llvm-svn: 213351

2 files changed, 12 insertions, 2 deletions

diff --git a/llvm/lib/Target/R600/AMDGPUSubtarget.h b/llvm/lib/Target/R600/AMDGPUSubtarget.h
index 0edaca38219..a844b37b6be 100644
--- a/llvm/lib/Target/R600/AMDGPUSubtarget.h
+++ b/llvm/lib/Target/R600/AMDGPUSubtarget.h
@@ -123,8 +123,10 @@ public:
     if (Size == 32)
       return (getGeneration() >= EVERGREEN);
 
-    assert(Size == 64);
-    return (getGeneration() >= SOUTHERN_ISLANDS);
+    if (Size == 64)
+      return (getGeneration() >= SOUTHERN_ISLANDS);
+
+    return false;
   }
 
   bool hasMulU24() const {
diff --git a/llvm/lib/Target/R600/AMDGPUTargetTransformInfo.cpp b/llvm/lib/Target/R600/AMDGPUTargetTransformInfo.cpp
index 2d934a4cb09..e3a546e1d72 100644
--- a/llvm/lib/Target/R600/AMDGPUTargetTransformInfo.cpp
+++ b/llvm/lib/Target/R600/AMDGPUTargetTransformInfo.cpp
@@ -77,6 +77,8 @@ public:
   void getUnrollingPreferences(Loop *L,
                                UnrollingPreferences &UP) const override;
 
+  PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) const override;
+
   /// @}
 };
 
@@ -119,3 +121,9 @@ void AMDGPUTTI::getUnrollingPreferences(Loop *L,
     }
   }
 }
+
+AMDGPUTTI::PopcntSupportKind
+AMDGPUTTI::getPopcntSupport(unsigned TyWidth) const {
+  assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2");
+  return ST->hasBCNT(TyWidth) ? PSK_FastHardware : PSK_Software;
+}