[MSP430] Add RTLIB::[SRL/SRA/SHL]_I32 lowering to EABI lib calls

Author: chbessonova

src/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp

@@ -217,7 +217,11 @@ MSP430TargetLowering::MSP430TargetLowering(const TargetMachine &TM,
     // { RTLIB::NEG_F64,  "__mspabi_negd", ISD::SETCC_INVALID },
     // { RTLIB::NEG_F32,  "__mspabi_negf", ISD::SETCC_INVALID },
 
-    // TODO: SLL/SRA/SRL are in libgcc, RLL isn't
+    // TODO: __mspabi_[srli/srai/slli] ARE implemented in libgcc
+    { RTLIB::SRL_I32,    "__mspabi_srll", ISD::SETCC_INVALID },
+    { RTLIB::SRA_I32,    "__mspabi_sral", ISD::SETCC_INVALID },
+    { RTLIB::SHL_I32,    "__mspabi_slll", ISD::SETCC_INVALID },
+    // __mspabi_[srlll/srall/sllll/rlli/rllll] are NOT implemented in libgcc
 
     // Universal Integer Operations - EABI Table 9
     { RTLIB::SDIV_I16,   "__mspabi_divi", ISD::SETCC_INVALID },

src/llvm/test/CodeGen/MSP430/libcalls.ll

@@ -604,4 +604,39 @@ entry:
   ret i64 %1
 }
 
+@i = external global i32, align 2
+
+define i32 @srll() #0 {
+entry:
+; CHECK-LABEL: srll:
+; CHECK: call #__mspabi_srll
+  %0 = load volatile i32, i32* @g_i32, align 2
+  %1 = load volatile i32, i32* @i, align 2
+  %shr = lshr i32 %0, %1
+
+  ret i32 %shr
+}
+
+define i32 @sral() #0 {
+entry:
+; CHECK-LABEL: sral:
+; CHECK: call #__mspabi_sral
+  %0 = load volatile i32, i32* @g_i32, align 2
+  %1 = load volatile i32, i32* @i, align 2
+  %shr = ashr i32 %0, %1
+
+  ret i32 %shr
+}
+
+define i32 @slll() #0 {
+entry:
+; CHECK-LABEL: slll:
+; CHECK: call #__mspabi_slll
+  %0 = load volatile i32, i32* @g_i32, align 2
+  %1 = load volatile i32, i32* @i, align 2
+  %shr = shl i32 %0, %1
+
+  ret i32 %shr
+}
+
 attributes #0 = { nounwind }