[llvm] ARM: Remove idiv runtime call aliases (PR #152098)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm updated https://github.com/llvm/llvm-project/pull/152098

>From fea15845c16fca451a3e1c1e105b8d293841ae5a Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Tue, 5 Aug 2025 15:24:08 +0900
Subject: [PATCH] ARM: Remove idiv runtime call aliases

Really only the i32 variants exist. We don't need synthetic
aliases for illegal types which will be promoted.
---
 llvm/include/llvm/IR/RuntimeLibcalls.td | 8 ++------
 llvm/lib/IR/RuntimeLibcalls.cpp         | 6 ++----
 llvm/lib/Target/ARM/ARMISelLowering.cpp | 8 ++------
 3 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/llvm/include/llvm/IR/RuntimeLibcalls.td b/llvm/include/llvm/IR/RuntimeLibcalls.td
index 384b7f29b9073..8c53f12cf09ac 100644
--- a/llvm/include/llvm/IR/RuntimeLibcalls.td
+++ b/llvm/include/llvm/IR/RuntimeLibcalls.td
@@ -1399,13 +1399,9 @@ def __aeabi_lasr : RuntimeLibcallImpl<SRA_I64>; // CallingConv::ARM_AAPCS
 
 // Integer division functions
 // RTABI chapter 4.3.1
-def __aeabi_idiv__i8 : RuntimeLibcallImpl<SDIV_I8, "__aeabi_idiv">; // CallingConv::ARM_AAPCS
-def __aeabi_idiv__i16 : RuntimeLibcallImpl<SDIV_I16, "__aeabi_idiv">; // CallingConv::ARM_AAPCS
-def __aeabi_idiv__i32 : RuntimeLibcallImpl<SDIV_I32, "__aeabi_idiv">; // CallingConv::ARM_AAPCS
+def __aeabi_idiv : RuntimeLibcallImpl<SDIV_I32, "__aeabi_idiv">; // CallingConv::ARM_AAPCS
 def __aeabi_ldivmod : RuntimeLibcallImpl<SDIVREM_I64>; //  CallingConv::ARM_AAPCS
-def __aeabi_uidiv__i8 : RuntimeLibcallImpl<UDIV_I8, "__aeabi_uidiv">; // CallingConv::ARM_AAPCS
-def __aeabi_uidiv__i16 : RuntimeLibcallImpl<UDIV_I16, "__aeabi_uidiv">; // CallingConv::ARM_AAPCS
-def __aeabi_uidiv__i32 : RuntimeLibcallImpl<UDIV_I32, "__aeabi_uidiv">; // CallingConv::ARM_AAPCS
+def __aeabi_uidiv : RuntimeLibcallImpl<UDIV_I32, "__aeabi_uidiv">; // CallingConv::ARM_AAPCS
 def __aeabi_uldivmod : RuntimeLibcallImpl<UDIVREM_I64>; // CallingConv::ARM_AAPCS
 
 def __aeabi_idivmod : RuntimeLibcallImpl<SDIVREM_I32>; //  CallingConv::ARM_AAPCS
diff --git a/llvm/lib/IR/RuntimeLibcalls.cpp b/llvm/lib/IR/RuntimeLibcalls.cpp
index b6e2cac5f7b04..a8e6c7938cf54 100644
--- a/llvm/lib/IR/RuntimeLibcalls.cpp
+++ b/llvm/lib/IR/RuntimeLibcalls.cpp
@@ -47,11 +47,9 @@ static void setARMLibcallNames(RuntimeLibcallsInfo &Info, const Triple &TT,
       RTLIB::__aeabi_ui2f,        RTLIB::__aeabi_l2f,
       RTLIB::__aeabi_ul2f,        RTLIB::__aeabi_lmul,
       RTLIB::__aeabi_llsl,        RTLIB::__aeabi_llsr,
-      RTLIB::__aeabi_lasr,        RTLIB::__aeabi_idiv__i8,
-      RTLIB::__aeabi_idiv__i16,   RTLIB::__aeabi_idiv__i32,
+      RTLIB::__aeabi_lasr,        RTLIB::__aeabi_idiv,
       RTLIB::__aeabi_idivmod,     RTLIB::__aeabi_uidivmod,
-      RTLIB::__aeabi_ldivmod,     RTLIB::__aeabi_uidiv__i8,
-      RTLIB::__aeabi_uidiv__i16,  RTLIB::__aeabi_uidiv__i32,
+      RTLIB::__aeabi_ldivmod,     RTLIB::__aeabi_uidiv,
       RTLIB::__aeabi_uldivmod,    RTLIB::__aeabi_f2h,
       RTLIB::__aeabi_d2h,         RTLIB::__aeabi_h2f,
       RTLIB::__aeabi_memcpy,      RTLIB::__aeabi_memmove,
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index 936625606e315..7f8b4460bb814 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -669,13 +669,9 @@ ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM_,
 
       // Integer division functions
       // RTABI chapter 4.3.1
-      { RTLIB::SDIV_I8,  RTLIB::__aeabi_idiv__i8 },
-      { RTLIB::SDIV_I16, RTLIB::__aeabi_idiv__i16 },
-      { RTLIB::SDIV_I32, RTLIB::__aeabi_idiv__i32},
+      { RTLIB::SDIV_I32, RTLIB::__aeabi_idiv },
       { RTLIB::SDIV_I64, RTLIB::__aeabi_ldivmod },
-      { RTLIB::UDIV_I8,  RTLIB::__aeabi_uidiv__i8 },
-      { RTLIB::UDIV_I16, RTLIB::__aeabi_uidiv__i16 },
-      { RTLIB::UDIV_I32, RTLIB::__aeabi_uidiv__i32 },
+      { RTLIB::UDIV_I32, RTLIB::__aeabi_uidiv },
       { RTLIB::UDIV_I64, RTLIB::__aeabi_uldivmod },
     };
     // clang-format on