[llvm] [PowerPC] vector compare greater than support (PR #150422)

[via llvm-commits]

https://github.com/Himadhith updated https://github.com/llvm/llvm-project/pull/150422

>From 84e4923870e50b8c6796b2b731708d6b553256ad Mon Sep 17 00:00:00 2001
From: himadhith <himadhith.v at ibm.com>
Date: Thu, 24 Jul 2025 13:40:10 +0000
Subject: [PATCH] [PowerPC] vector compare greater than support for Zero vector
 comparisons

---
 llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index 415164fc9e2cb..9d4289d241cd1 100644
--- a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -4569,7 +4569,14 @@ bool PPCDAGToDAGISel::trySETCC(SDNode *N) {
   if (!IsStrict && LHS.getValueType().isVector()) {
     if (Subtarget->hasSPE())
       return false;
-
+    // Check if RHS or LHS vector operands are 0 and change SETNE to either
+    // SETUGT or SETULT.
+    if (CC == ISD::SETNE) {
+      if (ISD::isBuildVectorAllZeros(RHS.getNode()))
+        CC = ISD::SETUGT;
+      else if (ISD::isBuildVectorAllZeros(LHS.getNode()))
+        CC = ISD::SETULT;
+    }
     EVT VecVT = LHS.getValueType();
     bool Swap, Negate;
     unsigned int VCmpInst =