[ARM,MVE] Add ACLE intrinsics for VCVT[ANPM] family.

Summary:
These instructions convert a vector of floats to a vector of integers
of the same size, with assorted non-default rounding modes.
Implemented in IR as target-specific intrinsics, because as far as I
can see there are no matches for that functionality in the standard IR
intrinsics list.

Reviewers: MarkMurrayARM, dmgreen, miyuki, ostannard

Reviewed By: dmgreen

Subscribers: kristof.beyls, hiraditya, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D75255

Author: statham-arm

clang/include/clang/Basic/arm_mve.td

@@ -482,11 +482,25 @@ multiclass float_int_conversions<Type FScalar, Type IScalar, IRBuilderBase ftoi,
     let pnt = PNT_None in {
       def : Intrinsic<IVector, (args FVector:$a), (ftoi $a, IVector)>,
             NameOverride<"vcvtq_" # IScalar>;
+
+      foreach suffix = ["a","n","p","m"] in
+        def : Intrinsic<IVector, (args FVector:$a),
+                        (IRInt<"vcvt"#suffix, [IVector, FVector]>
+                            (unsignedflag IScalar), $a)>,
+              NameOverride<"vcvt"#suffix#"q_" # IScalar>;
     }
     defm vcvtq: IntrinsicMX<IVector, (args FVector:$a, Predicate:$pred),
         (IRInt<"vcvt_fp_int_predicated", [IVector, FVector, Predicate]>
             $a, (unsignedflag IScalar), $pred, $inactive),
         1, "_" # IScalar, PNT_2Type, PNT_None>;
+
+    foreach suffix = ["a","n","p","m"] in {
+      defm "vcvt"#suffix#"q" : IntrinsicMX<
+          IVector, (args FVector:$a, Predicate:$pred),
+          (IRInt<"vcvt"#suffix#"_predicated", [IVector, FVector, Predicate]>
+              (unsignedflag IScalar), $inactive, $a, $pred),
+          1, "_" # IScalar, PNT_2Type, PNT_None>;
+    }
   }
 }