[PATCH] [AArch64 NEON] Get instruction BSL be matched to VSELECT. -Clang

[Kevin Qin]

Hi t.p.northover,

Hi Tim,

This is small changes in Clang to replace IR intrinsic with vselect.

http://llvm-reviews.chandlerc.com/D2360

Files:
  lib/CodeGen/CGBuiltin.cpp

Index: lib/CodeGen/CGBuiltin.cpp
===================================================================
--- lib/CodeGen/CGBuiltin.cpp
+++ lib/CodeGen/CGBuiltin.cpp
@@ -2700,6 +2700,16 @@
   return CGF.EmitNeonCall(TblF, TblOps, Name);
 }
 
+static Value *EmitAArch64BslBuiltinExpr(CodeGenFunction &CGF,
+                                        SmallVector<Value *, 4> &Ops) {
+  unsigned Lane =
+      dyn_cast<llvm::VectorType>(Ops[0]->getType())->getVectorNumElements();
+  llvm::Type *Int1Ty = llvm::Type::getInt1Ty(CGF.CGM.getLLVMContext());
+  llvm::VectorType *CondTy = llvm::VectorType::get(Int1Ty, Lane);
+  Value *Cond = CGF.Builder.CreateTrunc(Ops[0], CondTy);
+  return CGF.Builder.CreateSelect(Cond, Ops[1], Ops[2]);
+}
+
 static Value *EmitAArch64TblBuiltinExpr(CodeGenFunction &CGF,
                                         unsigned BuiltinID,
                                         const CallExpr *E) {
@@ -2810,8 +2820,7 @@
     BslOps.push_back(CmpRes);
     BslOps.push_back(Ops[0]);
     BslOps.push_back(TblRes);
-    Function *BslF = CGF.CGM.getIntrinsic(Intrinsic::arm_neon_vbsl, Ty);
-    return CGF.EmitNeonCall(BslF, BslOps, "vbsl");
+    return EmitAArch64BslBuiltinExpr(CGF, BslOps);
   }
   case AArch64::BI__builtin_neon_vtbx2_v: {
     TblOps.push_back(Ops[1]);
@@ -2836,8 +2845,7 @@
     BslOps.push_back(CmpRes);
     BslOps.push_back(Ops[0]);
     BslOps.push_back(TblRes);
-    Function *BslF = CGF.CGM.getIntrinsic(Intrinsic::arm_neon_vbsl, Ty);
-    return CGF.EmitNeonCall(BslF, BslOps, "vbsl");
+    return EmitAArch64BslBuiltinExpr(CGF, BslOps);
   }
   case AArch64::BI__builtin_neon_vtbx4_v: {
     TblOps.push_back(Ops[1]);
@@ -3012,9 +3020,8 @@
   case AArch64::BI__builtin_neon_vfmaq_v:
     return EmitARMBuiltinExpr(ARM::BI__builtin_neon_vfmaq_v, E);
   case AArch64::BI__builtin_neon_vbsl_v:
-    return EmitARMBuiltinExpr(ARM::BI__builtin_neon_vbsl_v, E);
   case AArch64::BI__builtin_neon_vbslq_v:
-    return EmitARMBuiltinExpr(ARM::BI__builtin_neon_vbslq_v, E);
+    return EmitAArch64BslBuiltinExpr(*this, Ops);
   case AArch64::BI__builtin_neon_vrsqrts_v:
     return EmitARMBuiltinExpr(ARM::BI__builtin_neon_vrsqrts_v, E);
   case AArch64::BI__builtin_neon_vrsqrtsq_v:
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