Use table of intrinsics for intrinsic ID lookup

Author: lukel97

llvm/lib/Analysis/VectorUtils.cpp

@@ -240,46 +240,28 @@ Intrinsic::ID llvm::getVectorIntrinsicIDForCall(const CallInst *CI,
   return Intrinsic::not_intrinsic;
 }
 
+struct InterleaveIntrinsic {
+  Intrinsic::ID Interleave, Deinterleave;
+};
+
+static InterleaveIntrinsic InterleaveIntrinsics[] = {
+    {Intrinsic::vector_interleave2, Intrinsic::vector_deinterleave2},
+    {Intrinsic::vector_interleave3, Intrinsic::vector_deinterleave3},
+    {Intrinsic::vector_interleave4, Intrinsic::vector_deinterleave4},
+    {Intrinsic::vector_interleave5, Intrinsic::vector_deinterleave5},
+    {Intrinsic::vector_interleave6, Intrinsic::vector_deinterleave6},
+    {Intrinsic::vector_interleave7, Intrinsic::vector_deinterleave7},
+    {Intrinsic::vector_interleave8, Intrinsic::vector_deinterleave8},
+};
+
 Intrinsic::ID llvm::getInterleaveIntrinsicID(unsigned Factor) {
-  switch (Factor) {
-  case 2:
-    return Intrinsic::vector_interleave2;
-  case 3:
-    return Intrinsic::vector_interleave3;
-  case 4:
-    return Intrinsic::vector_interleave4;
-  case 5:
-    return Intrinsic::vector_interleave5;
-  case 6:
-    return Intrinsic::vector_interleave6;
-  case 7:
-    return Intrinsic::vector_interleave7;
-  case 8:
-    return Intrinsic::vector_interleave8;
-  default:
-    llvm_unreachable("Unexpected factor");
-  }
+  assert(Factor >= 2 && Factor <= 8 && "Unexpected factor");
+  return InterleaveIntrinsics[Factor - 2].Interleave;
 }
 
 Intrinsic::ID llvm::getDeinterleaveIntrinsicID(unsigned Factor) {
-  switch (Factor) {
-  case 2:
-    return Intrinsic::vector_deinterleave2;
-  case 3:
-    return Intrinsic::vector_deinterleave3;
-  case 4:
-    return Intrinsic::vector_deinterleave4;
-  case 5:
-    return Intrinsic::vector_deinterleave5;
-  case 6:
-    return Intrinsic::vector_deinterleave6;
-  case 7:
-    return Intrinsic::vector_deinterleave7;
-  case 8:
-    return Intrinsic::vector_deinterleave8;
-  default:
-    llvm_unreachable("Unexpected factor");
-  }
+  assert(Factor >= 2 && Factor <= 8 && "Unexpected factor");
+  return InterleaveIntrinsics[Factor - 2].Deinterleave;
 }
 
 /// Given a vector and an element number, see if the scalar value is