ARM: Start moving runtime libcalls into tablegen

arsenm · arsenm · commit 711189f1b40a · 2025-07-08T22:04:47.000+09:00
We still need to manually set the calling conventions of
some libcalls until the lowering is separated out.
diff --git a/llvm/include/llvm/IR/RuntimeLibcalls.h b/llvm/include/llvm/IR/RuntimeLibcalls.h
@@ -177,7 +177,8 @@ struct RuntimeLibcallsInfo {
   void initDefaultLibCallImpls();
 
   /// Generated by tablegen.
-  void setTargetRuntimeLibcallSets(const Triple &TT);
+  void setTargetRuntimeLibcallSets(const Triple &TT,
+                                   FloatABI::ABIType FloatABI);
 
   /// Set default libcall names. If a target wants to opt-out of a libcall it
   /// should be placed here.
diff --git a/llvm/include/llvm/IR/RuntimeLibcalls.td b/llvm/include/llvm/IR/RuntimeLibcalls.td
@@ -17,6 +17,7 @@ class DuplicateLibcallImplWithPrefix<RuntimeLibcallImpl Impl, string prefix>
 
 /// Libcall Predicates
 def isOSDarwin : RuntimeLibcallPredicate<"TT.isOSDarwin()">;
+def isOSWindows : RuntimeLibcallPredicate<"TT.isOSWindows()">;
 
 def darwinHasSinCosStret : RuntimeLibcallPredicate<"darwinHasSinCosStret(TT)">;
 def darwinHasExp10 : RuntimeLibcallPredicate<"darwinHasExp10(TT)">;
@@ -1272,6 +1273,7 @@ def __aeabi_memclr4 : RuntimeLibcallImpl<AEABI_MEMCLR4>;
 def __aeabi_memclr8 : RuntimeLibcallImpl<AEABI_MEMCLR8>;
 
 // isTargetWindows()
+defset list<RuntimeLibcallImpl> WindowsFPIntCastLibcalls = {
 def __stoi64 : RuntimeLibcallImpl<FPTOSINT_F32_I64>; // CallingConv::ARM_AAPCS_VFP
 def __dtoi64 : RuntimeLibcallImpl<FPTOSINT_F64_I64>; // CallingConv::ARM_AAPCS_VFP
 def __stou64 : RuntimeLibcallImpl<FPTOUINT_F32_I64>; // CallingConv::ARM_AAPCS_VFP
@@ -1280,6 +1282,7 @@ def __i64tos : RuntimeLibcallImpl<SINTTOFP_I64_F32>; // CallingConv::ARM_AAPCS_V
 def __i64tod : RuntimeLibcallImpl<SINTTOFP_I64_F64>; // CallingConv::ARM_AAPCS_VFP
 def __u64tos : RuntimeLibcallImpl<UINTTOFP_I64_F32>; // CallingConv::ARM_AAPCS_VFP
 def __u64tod : RuntimeLibcallImpl<UINTTOFP_I64_F64>; // CallingConv::ARM_AAPCS_VFP
+}
 
 def __rt_sdiv : RuntimeLibcallImpl<SDIVREM_I32>; // CallingConv::ARM_AAPCS
 def __rt_sdiv64 : RuntimeLibcallImpl<SDIVREM_I64>; // CallingConv::ARM_AAPCS
@@ -1306,6 +1309,51 @@ def __aeabi_h2f : RuntimeLibcallImpl<FPEXT_F16_F32>; // CallingConv::ARM_AAPCS
 def __gnu_f2h_ieee : RuntimeLibcallImpl<FPROUND_F32_F16>;
 def __gnu_h2f_ieee : RuntimeLibcallImpl<FPEXT_F16_F32>;
 
+
+def WindowARMDivRemCalls : LibcallImpls<
+  (add __rt_sdiv, __rt_sdiv64, __rt_udiv, __rt_udiv64),
+  isOSWindows> {
+  let CallingConv = ARM_AAPCS;
+}
+
+def WindowARMFPIntCasts : LibcallImpls<
+  (add WindowsFPIntCastLibcalls),
+  isOSWindows> {
+  let CallingConv = ARM_AAPCS_VFP;
+}
+
+
+// Register based DivRem for AEABI (RTABI 4.2)
+def AEABIDivRemCalls : LibcallImpls<
+  (add __aeabi_idivmod, __aeabi_ldivmod,
+       __aeabi_uidivmod, __aeabi_uldivmod),
+  RuntimeLibcallPredicate<[{TT.isTargetAEABI() || TT.isAndroid() || TT.isTargetGNUAEABI() ||
+    TT.isTargetMuslAEABI()}]>> {
+  let CallingConv = ARM_AAPCS;
+}
+
+def isARMOrThumb : RuntimeLibcallPredicate<"TT.isARM() || TT.isThumb()">;
+
+def ARMSystemLibrary
+    : SystemRuntimeLibrary<isARMOrThumb,
+      (add DefaultLibcallImpls32,
+           WindowARMDivRemCalls,
+           WindowARMFPIntCasts,
+           AEABIDivRemCalls,
+           DarwinSinCosStret, DarwinExp10,
+
+           // Use divmod compiler-rt calls for iOS 5.0 and later.
+           LibcallImpls<(add __divmodsi4, __udivmodsi4),
+                        RuntimeLibcallPredicate<[{TT.isOSBinFormatMachO() &&
+                                                  (!TT.isiOS() || !TT.isOSVersionLT(5, 0))}]>>)> {
+  let DefaultLibcallCallingConv = LibcallCallingConv<[{
+     (!TT.isOSDarwin() && !TT.isiOS() && !TT.isWatchOS() && !TT.isDriverKit()) ?
+        (FloatABI == FloatABI::Hard ? CallingConv::ARM_AAPCS_VFP
+                                    : CallingConv::ARM_AAPCS) :
+                                      CallingConv::C
+  }]>;
+}
+
 //===----------------------------------------------------------------------===//
 // AVR Runtime Libcalls
 //===----------------------------------------------------------------------===//
diff --git a/llvm/lib/IR/RuntimeLibcalls.cpp b/llvm/lib/IR/RuntimeLibcalls.cpp
@@ -25,77 +25,6 @@ static cl::opt<bool>
 static void setARMLibcallNames(RuntimeLibcallsInfo &Info, const Triple &TT,
                                FloatABI::ABIType FloatABIType,
                                EABI EABIVersion) {
-  if (!TT.isOSDarwin() && !TT.isiOS() && !TT.isWatchOS() && !TT.isDriverKit()) {
-    CallingConv::ID DefaultCC = FloatABIType == FloatABI::Hard
-                                    ? CallingConv::ARM_AAPCS_VFP
-                                    : CallingConv::ARM_AAPCS;
-    for (RTLIB::LibcallImpl LC : RTLIB::libcall_impls())
-      Info.setLibcallImplCallingConv(LC, DefaultCC);
-  }
-
-  // Register based DivRem for AEABI (RTABI 4.2)
-  if (TT.isTargetAEABI() || TT.isAndroid() || TT.isTargetGNUAEABI() ||
-      TT.isTargetMuslAEABI() || TT.isOSWindows()) {
-    if (TT.isOSWindows()) {
-      const struct {
-        const RTLIB::Libcall Op;
-        const RTLIB::LibcallImpl Impl;
-        const CallingConv::ID CC;
-      } LibraryCalls[] = {
-          {RTLIB::SDIVREM_I32, RTLIB::__rt_sdiv, CallingConv::ARM_AAPCS},
-          {RTLIB::SDIVREM_I64, RTLIB::__rt_sdiv64, CallingConv::ARM_AAPCS},
-          {RTLIB::UDIVREM_I32, RTLIB::__rt_udiv, CallingConv::ARM_AAPCS},
-          {RTLIB::UDIVREM_I64, RTLIB::__rt_udiv64, CallingConv::ARM_AAPCS},
-      };
-
-      for (const auto &LC : LibraryCalls) {
-        Info.setLibcallImpl(LC.Op, LC.Impl);
-        Info.setLibcallImplCallingConv(LC.Impl, LC.CC);
-      }
-    } else {
-      const struct {
-        const RTLIB::Libcall Op;
-        const RTLIB::LibcallImpl Impl;
-      } LibraryCalls[] = {
-          {RTLIB::SDIVREM_I32, RTLIB::__aeabi_idivmod},
-          {RTLIB::SDIVREM_I64, RTLIB::__aeabi_ldivmod},
-          {RTLIB::UDIVREM_I32, RTLIB::__aeabi_uidivmod},
-          {RTLIB::UDIVREM_I64, RTLIB::__aeabi_uldivmod},
-      };
-
-      for (const auto &LC : LibraryCalls)
-        Info.setLibcallImpl(LC.Op, LC.Impl);
-    }
-  }
-
-  if (TT.isOSWindows()) {
-    static const struct {
-      const RTLIB::Libcall Op;
-      const RTLIB::LibcallImpl Impl;
-      const CallingConv::ID CC;
-    } LibraryCalls[] = {
-        {RTLIB::FPTOSINT_F32_I64, RTLIB::__stoi64, CallingConv::ARM_AAPCS_VFP},
-        {RTLIB::FPTOSINT_F64_I64, RTLIB::__dtoi64, CallingConv::ARM_AAPCS_VFP},
-        {RTLIB::FPTOUINT_F32_I64, RTLIB::__stou64, CallingConv::ARM_AAPCS_VFP},
-        {RTLIB::FPTOUINT_F64_I64, RTLIB::__dtou64, CallingConv::ARM_AAPCS_VFP},
-        {RTLIB::SINTTOFP_I64_F32, RTLIB::__i64tos, CallingConv::ARM_AAPCS_VFP},
-        {RTLIB::SINTTOFP_I64_F64, RTLIB::__i64tod, CallingConv::ARM_AAPCS_VFP},
-        {RTLIB::UINTTOFP_I64_F32, RTLIB::__u64tos, CallingConv::ARM_AAPCS_VFP},
-        {RTLIB::UINTTOFP_I64_F64, RTLIB::__u64tod, CallingConv::ARM_AAPCS_VFP},
-    };
-
-    for (const auto &LC : LibraryCalls) {
-      Info.setLibcallImpl(LC.Op, LC.Impl);
-      Info.setLibcallImplCallingConv(LC.Impl, LC.CC);
-    }
-  }
-
-  // Use divmod compiler-rt calls for iOS 5.0 and later.
-  if (TT.isOSBinFormatMachO() && (!TT.isiOS() || !TT.isOSVersionLT(5, 0))) {
-    Info.setLibcallImpl(RTLIB::SDIVREM_I32, RTLIB::__divmodsi4);
-    Info.setLibcallImpl(RTLIB::UDIVREM_I32, RTLIB::__udivmodsi4);
-  }
-
   static const RTLIB::LibcallImpl AAPCS_Libcalls[] = {
       RTLIB::__aeabi_dadd,        RTLIB::__aeabi_ddiv,
       RTLIB::__aeabi_dmul,        RTLIB::__aeabi_dsub,
@@ -212,7 +141,7 @@ void RuntimeLibcallsInfo::initLibcalls(const Triple &TT,
                                        ExceptionHandling ExceptionModel,
                                        FloatABI::ABIType FloatABI,
                                        EABI EABIVersion, StringRef ABIName) {
-  setTargetRuntimeLibcallSets(TT);
+  setTargetRuntimeLibcallSets(TT, FloatABI);
 
   // Use the f128 variants of math functions on x86
   if (TT.isX86() && TT.isGNUEnvironment())
diff --git a/llvm/test/TableGen/RuntimeLibcallEmitter-calling-conv.td b/llvm/test/TableGen/RuntimeLibcallEmitter-calling-conv.td
@@ -41,7 +41,7 @@ def MSP430LibraryWithCondCC : SystemRuntimeLibrary<isMSP430,
 >;
 
 
-// CHECK: void llvm::RTLIB::RuntimeLibcallsInfo::setTargetRuntimeLibcallSets(const llvm::Triple &TT) {
+// CHECK: void llvm::RTLIB::RuntimeLibcallsInfo::setTargetRuntimeLibcallSets(const llvm::Triple &TT, FloatABI::ABIType FloatABI) {
 // CHECK: if (TT.getArch() == Triple::avr && TT.isOSHurd()) {
 // CHECK-NEXT:   const CallingConv::ID DefaultCC = isFoo() ? CallingConv::Fast : CallingConv::GHC;
 // CHECK-NEXT:   for (CallingConv::ID &Entry : LibcallImplCallingConvs) {
diff --git a/llvm/test/TableGen/RuntimeLibcallEmitter.td b/llvm/test/TableGen/RuntimeLibcallEmitter.td
@@ -141,7 +141,7 @@ def BlahLibrary : SystemRuntimeLibrary<isBlahArch, (add calloc, LibraryWithCondi
 // CHECK-NEXT: };
 
 
-// CHECK: void llvm::RTLIB::RuntimeLibcallsInfo::setTargetRuntimeLibcallSets(const llvm::Triple &TT) {
+// CHECK: void llvm::RTLIB::RuntimeLibcallsInfo::setTargetRuntimeLibcallSets(const llvm::Triple &TT, FloatABI::ABIType FloatABI) {
 // CHECK-NEXT:  struct LibcallImplPair {
 // CHECK-NEXT:    RTLIB::Libcall Func;
 // CHECK-NEXT:    RTLIB::LibcallImpl Impl;
diff --git a/llvm/utils/TableGen/Basic/RuntimeLibcallsEmitter.cpp b/llvm/utils/TableGen/Basic/RuntimeLibcallsEmitter.cpp
@@ -362,7 +362,7 @@ void RuntimeLibcallEmitter::emitGetInitRuntimeLibcallNames(
 void RuntimeLibcallEmitter::emitSystemRuntimeLibrarySetCalls(
     raw_ostream &OS) const {
   OS << "void llvm::RTLIB::RuntimeLibcallsInfo::setTargetRuntimeLibcallSets("
-        "const llvm::Triple &TT) {\n"
+        "const llvm::Triple &TT, FloatABI::ABIType FloatABI) {\n"
         "  struct LibcallImplPair {\n"
         "    RTLIB::Libcall Func;\n"
         "    RTLIB::LibcallImpl Impl;\n"
