Remove NEON vmovn intrinsic, replacing it with vector truncate operations.

Auto-upgrade the old intrinsic and update tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112507 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IntrinsicsARM.td

@@ -303,7 +303,6 @@ def int_arm_neon_vcvtfxs2fp : Neon_CvtFxToFP_Intrinsic;
 def int_arm_neon_vcvtfxu2fp : Neon_CvtFxToFP_Intrinsic;
 
 // Narrowing and Lengthening Vector Moves.
-def int_arm_neon_vmovn : Neon_1Arg_Narrow_Intrinsic;
 def int_arm_neon_vqmovns : Neon_1Arg_Narrow_Intrinsic;
 def int_arm_neon_vqmovnu : Neon_1Arg_Narrow_Intrinsic;
 def int_arm_neon_vqmovnsu : Neon_1Arg_Narrow_Intrinsic;

lib/Target/ARM/ARMInstrNEON.td

@@ -956,6 +956,15 @@ class N2VQInt<bits<2> op24_23, bits<2> op21_20, bits<2> op19_18,
         (ins QPR:$src), itin, OpcodeStr, Dt, "$dst, $src", "",
         [(set QPR:$dst, (ResTy (IntOp (OpTy QPR:$src))))]>;
 
+// Narrow 2-register operations.
+class N2VN<bits<2> op24_23, bits<2> op21_20, bits<2> op19_18,
+           bits<2> op17_16, bits<5> op11_7, bit op6, bit op4,
+           InstrItinClass itin, string OpcodeStr, string Dt,
+           ValueType TyD, ValueType TyQ, SDNode OpNode>
+  : N2V<op24_23, op21_20, op19_18, op17_16, op11_7, op6, op4, (outs DPR:$dst),
+        (ins QPR:$src), itin, OpcodeStr, Dt, "$dst, $src", "",
+        [(set DPR:$dst, (TyD (OpNode (TyQ QPR:$src))))]>;
+
 // Narrow 2-register intrinsics.
 class N2VNInt<bits<2> op24_23, bits<2> op21_20, bits<2> op19_18,
               bits<2> op17_16, bits<5> op11_7, bit op6, bit op4,
@@ -1579,6 +1588,23 @@ multiclass N3V_QHSD<bit op24, bit op23, bits<4> op11_8, bit op4,
 }
 
 
+// Neon Narrowing 2-register vector operations,
+//   source operand element sizes of 16, 32 and 64 bits:
+multiclass N2VN_HSD<bits<2> op24_23, bits<2> op21_20, bits<2> op17_16,
+                    bits<5> op11_7, bit op6, bit op4, 
+                    InstrItinClass itin, string OpcodeStr, string Dt,
+                    SDNode OpNode> {
+  def v8i8  : N2VN<op24_23, op21_20, 0b00, op17_16, op11_7, op6, op4,
+                   itin, OpcodeStr, !strconcat(Dt, "16"),
+                   v8i8, v8i16, OpNode>;
+  def v4i16 : N2VN<op24_23, op21_20, 0b01, op17_16, op11_7, op6, op4,
+                   itin, OpcodeStr, !strconcat(Dt, "32"),
+                   v4i16, v4i32, OpNode>;
+  def v2i32 : N2VN<op24_23, op21_20, 0b10, op17_16, op11_7, op6, op4,
+                   itin, OpcodeStr, !strconcat(Dt, "64"),
+                   v2i32, v2i64, OpNode>;
+}
+
 // Neon Narrowing 2-register vector intrinsics,
 //   source operand element sizes of 16, 32 and 64 bits:
 multiclass N2VNInt_HSD<bits<2> op24_23, bits<2> op21_20, bits<2> op17_16,
@@ -3221,8 +3247,8 @@ def  VDUPfqf  : N2V<0b11, 0b11, {?,1}, {0,0}, 0b11000, 1, 0,
                     [(set QPR:$dst, (v4f32 (NEONvdup (f32 SPR:$src))))]>;
 
 //   VMOVN    : Vector Narrowing Move
-defm VMOVN    : N2VNInt_HSD<0b11,0b11,0b10,0b00100,0,0, IIC_VMOVD,
+defm VMOVN    : N2VN_HSD<0b11,0b11,0b10,0b00100,0,0, IIC_VMOVD,
-                            "vmovn", "i", int_arm_neon_vmovn>;
+                         "vmovn", "i", trunc>;
 //   VQMOVN   : Vector Saturating Narrowing Move
 defm VQMOVNs  : N2VNInt_HSD<0b11,0b11,0b10,0b00101,0,0, IIC_VQUNAiD,
                             "vqmovn", "s", int_arm_neon_vqmovns>;

lib/VMCore/AutoUpgrade.cpp

@@ -88,7 +88,9 @@ static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
           ((Name.compare(14, 5, "vaddw", 5) == 0 ||
             Name.compare(14, 5, "vsubw", 5) == 0) &&
            (Name.compare(19, 2, "s.", 2) == 0 ||
-            Name.compare(19, 2, "u.", 2) == 0))) {
+            Name.compare(19, 2, "u.", 2) == 0)) ||
+
+          (Name.compare(14, 6, "vmovn.", 6) == 0)) {
 
         // Calls to these are transformed into IR without intrinsics.
         NewFn = 0;
@@ -401,6 +403,9 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
         else
           NewI = BinaryOperator::CreateSub(V0, V1,"upgraded."+CI->getName(),CI);
 
+      } else if (Name.compare(14, 6, "vmovn.", 6) == 0) {
+        NewI = new TruncInst(CI->getArgOperand(0), CI->getType(),
+                             "upgraded." + CI->getName(), CI);
       } else {
         llvm_unreachable("Unknown arm.neon function for CallInst upgrade.");
       }

test/Bitcode/neon-intrinsics.ll

@@ -76,6 +76,20 @@
 ; CHECK: zext <4 x i16>
 ; CHECK-NEXT: sub <4 x i32>
 
+; vmovn should be auto-upgraded to trunc
+
+; CHECK: vmovni16
+; CHECK-NOT: arm.neon.vmovn.v8i8
+; CHECK: trunc <8 x i16>
+
+; CHECK: vmovni32
+; CHECK-NOT: arm.neon.vmovn.v4i16
+; CHECK: trunc <4 x i32>
+
+; CHECK: vmovni64
+; CHECK-NOT: arm.neon.vmovn.v2i32
+; CHECK: trunc <2 x i64>
+
 ; vld* and vst* intrinsic calls need an alignment argument (defaulted to 1)
 
 ; CHECK: vld1i8

test/CodeGen/ARM/vmov.ll

@@ -240,7 +240,7 @@ define <8 x i8> @vmovni16(<8 x i16>* %A) nounwind {
 ;CHECK: vmovni16:
 ;CHECK: vmovn.i16
 	%tmp1 = load <8 x i16>* %A
-	%tmp2 = call <8 x i8> @llvm.arm.neon.vmovn.v8i8(<8 x i16> %tmp1)
+	%tmp2 = trunc <8 x i16> %tmp1 to <8 x i8>
 	ret <8 x i8> %tmp2
 }
 
@@ -248,7 +248,7 @@ define <4 x i16> @vmovni32(<4 x i32>* %A) nounwind {
 ;CHECK: vmovni32:
 ;CHECK: vmovn.i32
 	%tmp1 = load <4 x i32>* %A
-	%tmp2 = call <4 x i16> @llvm.arm.neon.vmovn.v4i16(<4 x i32> %tmp1)
+	%tmp2 = trunc <4 x i32> %tmp1 to <4 x i16>
 	ret <4 x i16> %tmp2
 }
 
@@ -256,14 +256,10 @@ define <2 x i32> @vmovni64(<2 x i64>* %A) nounwind {
 ;CHECK: vmovni64:
 ;CHECK: vmovn.i64
 	%tmp1 = load <2 x i64>* %A
-	%tmp2 = call <2 x i32> @llvm.arm.neon.vmovn.v2i32(<2 x i64> %tmp1)
+	%tmp2 = trunc <2 x i64> %tmp1 to <2 x i32>
 	ret <2 x i32> %tmp2
 }
 
-declare <8 x i8>  @llvm.arm.neon.vmovn.v8i8(<8 x i16>) nounwind readnone
-declare <4 x i16> @llvm.arm.neon.vmovn.v4i16(<4 x i32>) nounwind readnone
-declare <2 x i32> @llvm.arm.neon.vmovn.v2i32(<2 x i64>) nounwind readnone
-
 define <8 x i8> @vqmovns16(<8 x i16>* %A) nounwind {
 ;CHECK: vqmovns16:
 ;CHECK: vqmovn.s16