ARM: Remove idiv runtime call aliases (#152098)

Really only the i32 variants exist. We don't need synthetic
aliases for illegal types which will be promoted.

Author: arsenm

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>; // 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>; // CallingConv::ARM_AAPCS
 def __aeabi_uldivmod : RuntimeLibcallImpl<UDIVREM_I64>; // CallingConv::ARM_AAPCS
 
 def __aeabi_idivmod : RuntimeLibcallImpl<SDIVREM_I32>; //  CallingConv::ARM_AAPCS

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,

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

llvm/test/CodeGen/ARM/div.ll

@@ -145,3 +145,57 @@ define i64 @f8(i64 %a) {
   %tmp1 = udiv i64 %a, 3
   ret i64 %tmp1
 }
+
+define i8 @sdiv_i8(i8 %a, i8 %b) {
+entry:
+; CHECK-LABEL: sdiv_i8
+; CHECK-SWDIV: __divsi3
+
+; CHECK-THUMB: .thumb_func
+; CHECK-HWDIV: sdiv
+
+; CHECK-EABI: __aeabi_idiv
+        %tmp1 = sdiv i8 %a, %b         ; <i8> [#uses=1]
+        ret i8 %tmp1
+}
+
+
+define i16 @sdiv_i16(i16 %a, i16 %b) {
+entry:
+; CHECK-LABEL: sdiv_i16
+; CHECK-SWDIV: __divsi3
+
+; CHECK-THUMB: .thumb_func
+; CHECK-HWDIV: sdiv
+
+; CHECK-EABI: __aeabi_idiv
+        %tmp1 = sdiv i16 %a, %b         ; <i16> [#uses=1]
+        ret i16 %tmp1
+}
+
+define i8 @udiv_i8(i8 %a, i8 %b) {
+entry:
+; CHECK-LABEL: udiv_i8
+; CHECK-SWDIV: __udivsi3
+
+; CHECK-THUMB: .thumb_func
+; CHECK-HWDIV: udiv
+
+; CHECK-EABI: __aeabi_uidiv
+        %tmp1 = udiv i8 %a, %b         ; <i8> [#uses=1]
+        ret i8 %tmp1
+}
+
+
+define i16 @udiv_i16(i16 %a, i16 %b) {
+entry:
+; CHECK-LABEL: udiv_i16
+; CHECK-SWDIV: __udivsi3
+
+; CHECK-THUMB: .thumb_func
+; CHECK-HWDIV: udiv
+
+; CHECK-EABI: __aeabi_uidiv
+        %tmp1 = udiv i16 %a, %b         ; <i16> [#uses=1]
+        ret i16 %tmp1
+}