[Hexagon] Handle truncate of v64i32 -> v64i1 when Hvx is enabled (#164931)

Fixes #160806

Author: pkarveti

llvm/lib/Target/Hexagon/HexagonPatternsHVX.td

@@ -612,6 +612,9 @@ let Predicates = [UseHVX] in {
  (V6_vandvrt HvxVR:$Vs, (ToI32 0x01010101))>;
  def: Pat<(VecQ32 (trunc HVI32:$Vs)),
  (V6_vandvrt HvxVR:$Vs, (ToI32 0x01010101))>;
+ def: Pat<(VecQ16 (trunc HWI32:$Vss)),
+ (Combineq(VecQ32(V6_vandvrt (HiVec $Vss), (ToI32 0x01010101))),
+ (VecQ32 (V6_vandvrt (LoVec $Vss), (ToI32 0x01010101))))>;
 }
 
 let Predicates = [UseHVX] in {

llvm/test/CodeGen/Hexagon/isel/trunc-vNi1-HVX.ll

@@ -0,0 +1,18 @@
+; RUN: llc --mtriple=hexagon -mattr=+hvxv79,+hvx-length128b < %s | FileCheck %s
+
+define void @f5(<64 x i32> %a0, ptr %a1) {
+; CHECK-LABEL: f5:
+; CHECK: [[REG0:(r[0-9]+)]] = ##16843009
+; CHECK-DAG: q[[Q0:[0-9]+]] = vand(v{{[0-9]+}},[[REG0]])
+; CHECK-DAG: q[[Q1:[0-9]+]] = vand(v{{[0-9]+}},[[REG0]])
+; CHECK: v{{[0-9]+}}.b = vpacke(v{{[0-9]+}}.h,v{{[0-9]+}}.h)
+; CHECK: v{{[0-9]+}}.b = vpacke(v{{[0-9]+}}.h,v{{[0-9]+}}.h)
+; CHECK: v[[VROR:[0-9]+]] = vror(v{{[0-9]+}},r{{[0-9]+}})
+; CHECK: v[[VOR:[0-9]+]] = vor(v[[VROR]],v{{[0-9]+}})
+; CHECK: q{{[0-9]+}} = vand(v[[VOR]],r{{[0-9]+}})
+b0:
+ %v0 = trunc <64 x i32> %a0 to <64 x i1>
+ store <64 x i1> %v0, ptr %a1, align 1
+ ret void
+}
+