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

2 files changed, 34 insertions, 3 deletions

diff --git a/lib/Target/ARM/ARMInstrNEON.td b/lib/Target/ARM/ARMInstrNEON.td
index 741df7e..1132911 100644
--- a/lib/Target/ARM/ARMInstrNEON.td
+++ b/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,
-                            "vmovn", "i", int_arm_neon_vmovn>;
+defm VMOVN    : N2VN_HSD<0b11,0b11,0b10,0b00100,0,0, IIC_VMOVD,
+                         "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>;
diff --git a/lib/VMCore/AutoUpgrade.cpp b/lib/VMCore/AutoUpgrade.cpp
index 62a4625..c994339 100644
--- a/lib/VMCore/AutoUpgrade.cpp
+++ b/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.");
       }