Add the nearbyint -> FNEARBYINT mapping to BasicTargetTransformInfo

This fixes an oversight that Intrinsic::nearbyint was not being mapped to
ISD::FNEARBYINT (thus fixing the over-optimistic cost we were assigning to
nearbyint calls for some targets).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185783 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/BasicTargetTransformInfo.cpp

@@ -443,6 +443,8 @@ unsigned BasicTTI::getIntrinsicInstrCost(Intrinsic::ID IID, Type *RetTy,
   case Intrinsic::floor:   ISD = ISD::FFLOOR; break;
   case Intrinsic::ceil:    ISD = ISD::FCEIL;  break;
   case Intrinsic::trunc:   ISD = ISD::FTRUNC; break;
+  case Intrinsic::nearbyint:
+                           ISD = ISD::FNEARBYINT; break;
   case Intrinsic::rint:    ISD = ISD::FRINT;  break;
   case Intrinsic::pow:     ISD = ISD::FPOW;   break;
   case Intrinsic::fma:     ISD = ISD::FMA;    break;

test/Analysis/CostModel/X86/intrinsic-cost.ll

@@ -30,3 +30,31 @@ for.end:                                          ; preds = %vector.body
 }
 
 declare <4 x float> @llvm.ceil.v4f32(<4 x float>)  nounwind readnone
+
+define void @test2(float* nocapture %f) nounwind {
+vector.ph:
+  br label %vector.body
+
+vector.body:                                      ; preds = %vector.body, %vector.ph
+  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
+  %0 = getelementptr inbounds float* %f, i64 %index
+  %1 = bitcast float* %0 to <4 x float>*
+  %wide.load = load <4 x float>* %1, align 4
+  %2 = call <4 x float> @llvm.nearbyint.v4f32(<4 x float> %wide.load)
+  store <4 x float> %2, <4 x float>* %1, align 4
+  %index.next = add i64 %index, 4
+  %3 = icmp eq i64 %index.next, 1024
+  br i1 %3, label %for.end, label %vector.body
+
+for.end:                                          ; preds = %vector.body
+  ret void
+
+; CORE2: Printing analysis 'Cost Model Analysis' for function 'test2':
+; CORE2: Cost Model: Found an estimated cost of 400 for instruction:   %2 = call <4 x float> @llvm.nearbyint.v4f32(<4 x float> %wide.load)
+
+; COREI7: Printing analysis 'Cost Model Analysis' for function 'test2':
+; COREI7: Cost Model: Found an estimated cost of 1 for instruction:   %2 = call <4 x float> @llvm.nearbyint.v4f32(<4 x float> %wide.load)
+
+}
+
+declare <4 x float> @llvm.nearbyint.v4f32(<4 x float>)  nounwind readnone