[llvm-branch-commits] [llvm] ARM: Start moving runtime libcalls into tablegen (PR #146084)
Matt Arsenault via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Fri Jun 27 07:21:47 PDT 2025
https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/146084
We still need to manually set the calling conventions of
some libcalls until the lowering is separated out.
>From 6e102219d860e13b8d8d684ae8330b0cd5f83f0e Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Mon, 23 Jun 2025 23:23:01 +0900
Subject: [PATCH] ARM: Start moving runtime libcalls into tablegen
We still need to manually set the calling conventions of
some libcalls until the lowering is separated out.
---
llvm/include/llvm/IR/RuntimeLibcalls.h | 2 +-
llvm/include/llvm/IR/RuntimeLibcalls.td | 48 ++++++++++++
llvm/lib/IR/RuntimeLibcalls.cpp | 76 +------------------
.../TableGen/Basic/RuntimeLibcallsEmitter.cpp | 2 +-
4 files changed, 51 insertions(+), 77 deletions(-)
diff --git a/llvm/include/llvm/IR/RuntimeLibcalls.h b/llvm/include/llvm/IR/RuntimeLibcalls.h
index ecf20cbfd09f2..7fb6b503daa22 100644
--- a/llvm/include/llvm/IR/RuntimeLibcalls.h
+++ b/llvm/include/llvm/IR/RuntimeLibcalls.h
@@ -168,7 +168,7 @@ 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
index 396dc45240412..ac9f258e39ad2 100644
--- a/llvm/include/llvm/IR/RuntimeLibcalls.td
+++ b/llvm/include/llvm/IR/RuntimeLibcalls.td
@@ -15,6 +15,9 @@ include "llvm/IR/RuntimeLibcallsImpl.td"
class DuplicateLibcallImplWithPrefix<RuntimeLibcallImpl Impl, string prefix>
: RuntimeLibcallImpl<Impl.Provides, prefix#Impl.LibCallFuncName>;
+/// Libcall Predicates
+def isOSWindows : RuntimeLibcallPredicate<"TT.isOSWindows()">;
+
//--------------------------------------------------------------------
// Declare all kinds of used libcalls
//--------------------------------------------------------------------
@@ -1243,6 +1246,7 @@ 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
@@ -1251,6 +1255,7 @@ 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
@@ -1277,6 +1282,49 @@ 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,
+ // 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
index 9f24e9d1fc4b1..46b4acde922e2 100644
--- a/llvm/lib/IR/RuntimeLibcalls.cpp
+++ b/llvm/lib/IR/RuntimeLibcalls.cpp
@@ -25,80 +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;
- const CallingConv::ID CC;
- } LibraryCalls[] = {
- {RTLIB::SDIVREM_I32, RTLIB::__aeabi_idivmod, CallingConv::ARM_AAPCS},
- {RTLIB::SDIVREM_I64, RTLIB::__aeabi_ldivmod, CallingConv::ARM_AAPCS},
- {RTLIB::UDIVREM_I32, RTLIB::__aeabi_uidivmod, CallingConv::ARM_AAPCS},
- {RTLIB::UDIVREM_I64, RTLIB::__aeabi_uldivmod, CallingConv::ARM_AAPCS},
- };
-
- for (const auto &LC : LibraryCalls) {
- Info.setLibcallImpl(LC.Op, LC.Impl);
- Info.setLibcallImplCallingConv(LC.Impl, LC.CC);
- }
- }
- }
-
- 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,
@@ -214,7 +140,7 @@ 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/utils/TableGen/Basic/RuntimeLibcallsEmitter.cpp b/llvm/utils/TableGen/Basic/RuntimeLibcallsEmitter.cpp
index 041c404dde9b3..81494f80fb5c9 100644
--- 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"
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