[llvm-branch-commits] [llvm] DAG: Avoid more uses of getLibcallName (PR #170402)

[Matt Arsenault via llvm-branch-commits]

https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/170402

None

>From 77249d0059b431c93dcb35424696f31b87ff635f Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Tue, 2 Dec 2025 20:41:15 -0500
Subject: [PATCH] DAG: Avoid more uses of getLibcallName

---
 llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp    | 2 +-
 llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 70950084ee6b7..0e52f0516b09a 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -4983,7 +4983,7 @@ static bool isDivRemLibcallAvailable(SDNode *Node, bool isSigned,
   case MVT::i128: LC= isSigned ? RTLIB::SDIVREM_I128:RTLIB::UDIVREM_I128; break;
   }
 
-  return TLI.getLibcallName(LC) != nullptr;
+  return TLI.getLibcallImpl(LC) != RTLIB::Unsupported;
 }
 
 /// Issue divrem if both quotient and remainder are needed.
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 3564cbebed5c2..0ba8816bf1e82 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -11121,7 +11121,8 @@ void TargetLowering::forceExpandWideMUL(SelectionDAG &DAG, const SDLoc &dl,
   else if (WideVT == MVT::i128)
     LC = RTLIB::MUL_I128;
 
-  if (LC == RTLIB::UNKNOWN_LIBCALL || !getLibcallName(LC)) {
+  RTLIB::LibcallImpl LibcallImpl = getLibcallImpl(LC);
+  if (LibcallImpl == RTLIB::Unsupported) {
     forceExpandMultiply(DAG, dl, Signed, Lo, Hi, LHS, RHS);
     return;
   }