[llvm-branch-commits] [llvm] Lanai: Use TableGen to set libcall calling conventions (PR #146080)

[Matt Arsenault via llvm-branch-commits]

https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/146080

None

>From 9cbb4db6b98fdb15ef00770df2068a2f73484a2f Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Mon, 23 Jun 2025 16:17:26 +0900
Subject: [PATCH] Lanai: Use TableGen to set libcall calling conventions

---
 llvm/include/llvm/IR/RuntimeLibcalls.td     | 12 ++++++++++++
 llvm/lib/Target/Lanai/LanaiISelLowering.cpp |  4 ----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/llvm/include/llvm/IR/RuntimeLibcalls.td b/llvm/include/llvm/IR/RuntimeLibcalls.td
index 59e9481201de4..396dc45240412 100644
--- a/llvm/include/llvm/IR/RuntimeLibcalls.td
+++ b/llvm/include/llvm/IR/RuntimeLibcalls.td
@@ -1360,6 +1360,18 @@ def __hexagon_fast2_sqrtdf2 : RuntimeLibcallImpl<SQRT_F64>;
 def __hexagon_memcpy_likely_aligned_min32bytes_mult8bytes
     : RuntimeLibcallImpl<HEXAGON_MEMCPY_LIKELY_ALIGNED_MIN32BYTES_MULT8BYTES>;
 
+//===----------------------------------------------------------------------===//
+// Lanai Runtime Libcalls
+//===----------------------------------------------------------------------===//
+
+def isLanai : RuntimeLibcallPredicate<"TT.getArch() == Triple::lanai">;
+
+// Use fast calling convention for library functions.
+def LanaiSystemLibrary
+    : SystemRuntimeLibrary<isLanai, (add DefaultRuntimeLibcallImpls)> {
+  let DefaultLibcallCallingConv = FASTCC;
+}
+
 //===----------------------------------------------------------------------===//
 // Mips16 Runtime Libcalls
 //===----------------------------------------------------------------------===//
diff --git a/llvm/lib/Target/Lanai/LanaiISelLowering.cpp b/llvm/lib/Target/Lanai/LanaiISelLowering.cpp
index ec668ebaeab0d..272c7bc1a8db6 100644
--- a/llvm/lib/Target/Lanai/LanaiISelLowering.cpp
+++ b/llvm/lib/Target/Lanai/LanaiISelLowering.cpp
@@ -150,10 +150,6 @@ LanaiTargetLowering::LanaiTargetLowering(const TargetMachine &TM,
   // statements. Re-evaluate this on new benchmarks.
   setMinimumJumpTableEntries(100);
 
-  // Use fast calling convention for library functions.
-  for (RTLIB::LibcallImpl LC : RTLIB::libcall_impls())
-    setLibcallImplCallingConv(LC, CallingConv::Fast);
-
   MaxStoresPerMemset = 16; // For @llvm.memset -> sequence of stores
   MaxStoresPerMemsetOptSize = 8;
   MaxStoresPerMemcpy = 16; // For @llvm.memcpy -> sequence of stores