Lanai: Use TableGen to set libcall calling conventions

[arsenm]

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[arsenm]

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• ARM: Start moving runtime libcalls into tablegen #146084
• ARM: Unconditionally set eabi libcall calling convs in RuntimeLibcalls #146083
• RuntimeLibcalls: Remove table of soft float compare cond codes #146082
• MSP430: Move libcall CC setting to RuntimeLibcallsInfo #146081
• Lanai: Use TableGen to set libcall calling conventions #146080 👈 (View in Graphite)
• TableGen: Handle setting runtime libcall calling conventions #144980
• RuntimeLibcalls: Associate calling convention with libcall impls #144979
• TableGen: Allow defining sets of runtime libraries #144978
• AArch64: Add libcall impl declarations for __arm_sc* memory functions #144977
• XCore: Declare libcalls used for align 4 memcpy #144976
• Hexagon: Add libcall declarations for special memcpy #144975
• ARM: Add runtime libcall definitions for aebi memory functions #144974
• TableGen: Generate enum for runtime libcall implementations #144973
• TableGen: Add runtime libcall backend #144972
• PowerPC: Stop reporting memcpy as an alias of memmove on AIX #143836
• main

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[llvmbot]

@llvm/pr-subscribers-tablegen

@llvm/pr-subscribers-llvm-ir

Author: Matt Arsenault (arsenm)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/146080.diff

2 Files Affected:

• (modified) llvm/include/llvm/IR/RuntimeLibcalls.td (+12)
• (modified) llvm/lib/Target/Lanai/LanaiISelLowering.cpp (-4)

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

[RKSimon]

LGTM