[llvm-branch-commits] [llvm] release/20.x: [Hexagon] Add missing patterns to select PFALSE and PTRUE (#138712) (PR #138770)

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https://github.com/llvmbot created 
https://github.com/llvm/llvm-project/pull/138770

Backport 57e8899

Requested by: @iajbar

>From 74bc3e2acd917c2e78a949a81e9f8de66aa9dde4 Mon Sep 17 00:00:00 2001
From: Ikhlas Ajbar <iaj...@quicinc.com>
Date: Tue, 6 May 2025 16:47:25 -0500
Subject: [PATCH] [Hexagon] Add missing patterns to select PFALSE and PTRUE
 (#138712)

Fixes #134659

(cherry picked from commit 57e88993fee30f4441e87df4df061393600b2ada)
---
 llvm/lib/Target/Hexagon/HexagonPatterns.td    |  5 ++++
 llvm/test/CodeGen/Hexagon/isel/pfalse-v4i1.ll | 29 +++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 llvm/test/CodeGen/Hexagon/isel/pfalse-v4i1.ll

diff --git a/llvm/lib/Target/Hexagon/HexagonPatterns.td 
b/llvm/lib/Target/Hexagon/HexagonPatterns.td
index 244f204539c89..acf701b0f3e5d 100644
--- a/llvm/lib/Target/Hexagon/HexagonPatterns.td
+++ b/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)>;
diff --git a/llvm/test/CodeGen/Hexagon/isel/pfalse-v4i1.ll 
b/llvm/test/CodeGen/Hexagon/isel/pfalse-v4i1.ll
new file mode 100644
index 0000000000000..c0904b8b4fdd6
--- /dev/null
+++ b/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

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