Implement return instruction (#120)

Author: LucasSte

llvm/lib/Target/SBF/SBFInstrInfo.td

@@ -69,6 +69,8 @@ def SBFExplicitSignExt : Predicate<"Subtarget->getHasExplicitSignExt()">;
 def SBFNoExplicitSignExt : Predicate<"!Subtarget->getHasExplicitSignExt()">;
 def SBFNewMemEncoding : Predicate<"Subtarget->getNewMemEncoding()">, AssemblerPredicate<(all_of FeatureNewMemEncoding)>;
 def SBFOldMemEncoding : Predicate<"!Subtarget->getNewMemEncoding()">;
+def SBFHasStaticSyscalls : Predicate<"Subtarget->getHasStaticSyscalls()">;
+def SBFNoStaticSyscalls : Predicate<"!Subtarget->getHasStaticSyscalls()">;
 
 def brtarget : Operand<OtherVT> {
   let PrintMethod = "printBrTargetOperand";
@@ -854,7 +856,7 @@ class NOP_I<string OpcodeStr>
 let hasSideEffects = 0, isCodeGenOnly = 1 in
   def NOP : NOP_I<"nop">;
 
-class RET<string OpcodeStr>
+class EXIT<string OpcodeStr>
     : TYPE_ALU_JMP<SBF_EXIT.Value, SBF_K.Value,
                    (outs),
                    (ins),
@@ -865,8 +867,23 @@ class RET<string OpcodeStr>
 }
 
 let isReturn = 1, isTerminator = 1, hasDelaySlot=0, isBarrier = 1,
-    isNotDuplicable = 1 in {
-  def RET : RET<"exit">;
+    isNotDuplicable = 1, Predicates = [SBFNoStaticSyscalls] in {
+  def EXIT : EXIT<"exit">;
+}
+
+class RETURN<string OpcodeStr>
+    : TYPE_ALU_JMP<SBF_EXIT.Value, SBF_X.Value,
+                   (outs),
+                   (ins),
+                   !strconcat(OpcodeStr, ""),
+                   [(SBFretglue)]> {
+  let Inst{31-0} = 0;
+  let SBFClass = SBF_JMP;
+}
+
+let isReturn = 1, isTerminator = 1, hasDelaySlot=0, isBarrier = 1,
+    isNotDuplicable = 1, Predicates = [SBFHasStaticSyscalls] in {
+  def RETURN : RETURN<"return">;
 }
 
 // ADJCALLSTACKDOWN/UP pseudo insns

llvm/lib/Target/SBF/SBFSubtarget.h

@@ -107,6 +107,7 @@ class SBFSubtarget : public SBFGenSubtargetInfo {
   bool getHasStoreImm() const { return HasStoreImm; }
   bool getHasExplicitSignExt() const { return HasExplicitSignExt; }
   bool getNewMemEncoding() const { return NewMemEncoding; }
+  bool getHasStaticSyscalls() const { return HasStaticSyscalls; }
   const SBFInstrInfo *getInstrInfo() const override { return &InstrInfo; }
   const SBFFrameLowering *getFrameLowering() const override {
     return &FrameLowering;

llvm/test/CodeGen/SBF/objdump_cond_op.ll

@@ -67,6 +67,6 @@ define i32 @test(i32, i32) local_unnamed_addr #0 {
   %16 = phi i32 [ %14, %13 ], [ %10, %8 ]
   ret i32 %16
 ; CHECK-LABEL: <LBB0_5>:
-; CHECK: exit
+; CHECK: return
 }
 attributes #0 = { norecurse nounwind }

llvm/test/CodeGen/SBF/objdump_cond_op_2.ll

@@ -33,6 +33,6 @@ define i32 @test(i32, i32) local_unnamed_addr #0 {
   %14 = phi i32 [ 0, %2 ], [ %9, %5 ]
   ret i32 %14
 ; CHECK-LABEL: <LBB0_2>:
-; CHECK: exit
+; CHECK: return
 }
 attributes #0 = { norecurse nounwind readnone }

llvm/test/CodeGen/SBF/objdump_static_var.ll

@@ -23,7 +23,7 @@ define dso_local i32 @test() local_unnamed_addr #0 {
   %4 = add i32 %2, %3
 ; CHECK: add64 r0, r1
   ret i32 %4
-; CHECK: exit
+; CHECK: return
 }
 
 attributes #0 = { norecurse nounwind }

llvm/test/CodeGen/SBF/objdump_trivial.ll

@@ -2,9 +2,9 @@
 
 ; CHECK: jsgt r2, r1,
 ; CHECK: call 0x1
-; CHECK: exit
+; CHECK: return
 ; CHECK: call 0x2
-; CHECK: exit
+; CHECK: return
 
 define void @foo(i32 %a) {
 %b = icmp sgt i32 %a, -1

llvm/test/CodeGen/SBF/return_instr.ll

@@ -0,0 +1,14 @@
+; RUN: llc < %s -march=sbf -show-mc-encoding | FileCheck --check-prefix=CHECK-V1 %s
+; RUN: llc < %s -march=sbf -mattr=+static-syscalls -show-mc-encoding | FileCheck --check-prefix=CHECK-V2 %s
+
+define dso_local i64 @rem(i64 %a) local_unnamed_addr #0 {
+entry:
+; CHECK-LABEL: rem
+  %rem = urem i64 %a, 15
+
+; CHECK-V1: exit    # encoding: [0x95,0x00,0x00,0x00,0x00,0x00,0x00,0x00]
+; CHECK-V2: return  # encoding: [0x9d,0x00,0x00,0x00,0x00,0x00,0x00,0x00]
+
+
+  ret i64 %rem
+}

llvm/test/MC/Disassembler/SBF/sbf-jmp.txt

@@ -108,3 +108,6 @@
 
 # CHECK-NEW: exit
 0x95,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+
+# CHECK-NEW: return
+0x9d,0x00,0x00,0x00,0x00,0x00,0x00,0x00

llvm/test/MC/SBF/sbf-return.s

@@ -0,0 +1,6 @@
+# RUN: llvm-mc -triple=sbf-solana-solana --mcpu=sbfv2 -filetype=obj -o %t %s
+# RUN: llvm-objdump -d -r %t | FileCheck --check-prefix=CHECK %s
+
+return
+
+// CHECK: 9d 00 00 00 00 00 00 00	return