[Hexagon] Add missing patterns to select PFALSE and PTRUE (llvm#138712)

Fixes llvm#134659

Author: iajbar

llvm/lib/Target/Hexagon/HexagonPatterns.td

@@ -109,7 +109,12 @@ def pfalse: PatFrag<(ops), (HexagonPFALSE)>;
 def pnot:   PatFrag<(ops node:$Pu), (xor node:$Pu, ptrue)>;
 
 def: Pat<(v8i1 (HexagonPFALSE)), (C2_tfrrp (A2_tfrsi (i32 0)))>;
+def: Pat<(v4i1 (HexagonPFALSE)), (C2_tfrrp (A2_tfrsi (i32 0)))>;
+def: Pat<(v2i1 (HexagonPFALSE)), (C2_tfrrp (A2_tfrsi (i32 0)))>;
+
 def: Pat<(v8i1 (HexagonPTRUE)), (C2_tfrrp (A2_tfrsi (i32 -1)))>;
+def: Pat<(v4i1 (HexagonPTRUE)), (C2_tfrrp (A2_tfrsi (i32 -1)))>;
+def: Pat<(v2i1 (HexagonPTRUE)), (C2_tfrrp (A2_tfrsi (i32 -1)))>;
 
 def valign: PatFrag<(ops node:$Vt, node:$Vs, node:$Ru),
                     (HexagonVALIGN node:$Vt, node:$Vs, node:$Ru)>;

llvm/test/CodeGen/Hexagon/isel/pfalse-v4i1.ll

@@ -0,0 +1,29 @@
+; RUN: llc -march=hexagon -debug-only=isel 2>&1 < %s - | FileCheck %s
+
+; CHECK: [[R0:%[0-9]+]]:intregs = A2_tfrsi 0
+; CHECK-NEXT: predregs = C2_tfrrp killed [[R0]]:intregs
+
+define fastcc i16 @test(ptr %0, { <4 x i32>, <4 x i1> } %1, <4 x i1> %2) {
+Entry:
+  %3 = alloca [16 x i8], i32 0, align 16
+  %4 = alloca [16 x i8], i32 0, align 16
+  store <4 x i32> <i32 1, i32 2, i32 3, i32 4>, ptr %4, align 16
+  store <4 x i32> <i32 5, i32 6, i32 7, i32 8>, ptr %3, align 16
+  %5 = load <4 x i32>, ptr %4, align 16
+  %6 = load <4 x i32>, ptr %3, align 16
+  %7 = call { <4 x i32>, <4 x i1> } @llvm.sadd.with.overflow.v4i32(<4 x i32> %5, <4 x i32> %6)
+  %8 = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> %2)
+  br i1 %8, label %OverflowFail, label %OverflowOk
+
+OverflowFail:                                     ; preds = %Entry
+  store volatile i32 0, ptr null, align 4
+    unreachable
+
+OverflowOk:                                       ; preds = %Entry
+  %9 = extractvalue { <4 x i32>, <4 x i1> } %7, 0
+    store <4 x i32> %9, ptr %0, align 16
+      ret i16 0
+      }
+
+declare { <4 x i32>, <4 x i1> } @llvm.sadd.with.overflow.v4i32(<4 x i32>, <4 x i32>) #0
+declare i1 @llvm.vector.reduce.or.v4i1(<4 x i1>) #0