GlobalISel: omit braces on MachineInstr types when there's only one.

Tidies up the representation a bit in the common case.

llvm-svn: 276772

1 files changed, 10 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/MIRParser/MIParser.cpp b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
index b1292bb48b0..170f9735d1f 100644
--- a/llvm/lib/CodeGen/MIRParser/MIParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
@@ -598,14 +598,20 @@ bool MIParser::parse(MachineInstr *&MI) {
   SmallVector<LLT, 1> Tys;
   if (isPreISelGenericOpcode(OpCode)) {
     // For generic opcode, at least one type is mandatory.
-    expectAndConsume(MIToken::lbrace);
+    auto Loc = Token.location();
+    bool ManyTypes = Token.is(MIToken::lbrace);
+    if (ManyTypes)
+      lex();
+
+    // Now actually parse the type(s).
     do {
-      auto Loc = Token.location();
       Tys.resize(Tys.size() + 1);
       if (parseLowLevelType(Loc, Tys[Tys.size() - 1]))
         return true;
-    } while (consumeIfPresent(MIToken::comma));
-    expectAndConsume(MIToken::rbrace);
+    } while (ManyTypes && consumeIfPresent(MIToken::comma));
+
+    if (ManyTypes)
+      expectAndConsume(MIToken::rbrace);
   }
 
   // Parse the remaining machine operands.