MIR Serialization: Serialize the 'killed' register machine operand flag.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241734 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MIRParser/MILexer.cpp

@@ -71,6 +71,7 @@ static MIToken::TokenKind getIdentifierKind(StringRef Identifier) {
       .Case("implicit", MIToken::kw_implicit)
       .Case("implicit-def", MIToken::kw_implicit_define)
       .Case("dead", MIToken::kw_dead)
+      .Case("killed", MIToken::kw_killed)
       .Default(MIToken::Identifier);
 }
 

lib/CodeGen/MIRParser/MILexer.h

@@ -40,6 +40,7 @@ struct MIToken {
     kw_implicit,
     kw_implicit_define,
     kw_dead,
+    kw_killed,
 
     // Identifier tokens
     Identifier,
@@ -75,7 +76,8 @@ public:
   }
 
   bool isRegisterFlag() const {
-    return Kind == kw_implicit || Kind == kw_implicit_define || Kind == kw_dead;
+    return Kind == kw_implicit || Kind == kw_implicit_define ||
+           Kind == kw_dead || Kind == kw_killed;
   }
 
   bool is(TokenKind K) const { return Kind == K; }

lib/CodeGen/MIRParser/MIParser.cpp

@@ -308,6 +308,9 @@ bool MIParser::parseRegisterFlag(unsigned &Flags) {
   case MIToken::kw_dead:
     Flags |= RegState::Dead;
     break;
+  case MIToken::kw_killed:
+    Flags |= RegState::Kill;
+    break;
   // TODO: report an error when we specify the same flag more than once.
   // TODO: parse the other register flags.
   default:
@@ -330,9 +333,9 @@ bool MIParser::parseRegisterOperand(MachineOperand &Dest, bool IsDef) {
     return true;
   lex();
   // TODO: Parse subregister.
-  Dest = MachineOperand::CreateReg(Reg, Flags & RegState::Define,
+  Dest = MachineOperand::CreateReg(
-                                   Flags & RegState::Implicit, /*IsKill=*/false,
+      Reg, Flags & RegState::Define, Flags & RegState::Implicit,
-                                   Flags & RegState::Dead);
+      Flags & RegState::Kill, Flags & RegState::Dead);
   return false;
 }
 
@@ -417,6 +420,7 @@ bool MIParser::parseMachineOperand(MachineOperand &Dest) {
   case MIToken::kw_implicit:
   case MIToken::kw_implicit_define:
   case MIToken::kw_dead:
+  case MIToken::kw_killed:
   case MIToken::underscore:
   case MIToken::NamedRegister:
     return parseRegisterOperand(Dest);

lib/CodeGen/MIRPrinter.cpp

@@ -218,6 +218,8 @@ void MIPrinter::print(const MachineOperand &Op, const TargetRegisterInfo *TRI) {
       OS << (Op.isDef() ? "implicit-def " : "implicit ");
     if (Op.isDead())
       OS << "dead ";
+    if (Op.isKill())
+      OS << "killed ";
     printReg(Op.getReg(), OS, TRI);
     // TODO: Print sub register.
     break;

test/CodeGen/MIR/X86/killed-register-flag.mir

@@ -0,0 +1,42 @@
+# RUN: llc -march=x86-64 -start-after branch-folder -stop-after branch-folder -o /dev/null %s | FileCheck %s
+# This test ensures that the MIR parser parses the 'killed' register flags
+# correctly.
+
+--- |
+
+  define i32 @foo(i32 %a) {
+  entry:
+    %0 = icmp sle i32 %a, 10
+    br i1 %0, label %less, label %exit
+
+  less:
+    ret i32 0
+
+  exit:
+    ret i32 %a
+  }
+
+...
+---
+name:            foo
+body:
+  - id:          0
+    name:        entry
+    instructions:
+      - 'CMP32ri8 %edi, 10, implicit-def %eflags'
+      - 'JG_1 %bb.2.exit, implicit %eflags'
+  - id:          1
+    name:        less
+    instructions:
+      # CHECK:      - '%eax = MOV32r0
+      # CHECK-NEXT: - 'RETQ killed %eax
+      - '%eax = MOV32r0 implicit-def %eflags'
+      - 'RETQ killed %eax'
+  - id:          2
+    name:        exit
+    instructions:
+      # CHECK:      - '%eax = COPY killed %edi
+      # CHECK-NEXT: - 'RETQ killed %eax
+      - '%eax = COPY killed %edi'
+      - 'RETQ killed %eax'
+...