[mips] Add comment and simplify function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187371 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Mips/InstPrinter/MipsInstPrinter.cpp b/lib/Target/Mips/InstPrinter/MipsInstPrinter.cpp
index 6babb74ba00b5d25b3ba01533dd0b9dbe127291b..a2098a0f8c0cb64e91fb5852a53bd017fe40ef6c 100644 (file)
--- a/lib/Target/Mips/InstPrinter/MipsInstPrinter.cpp
+++ b/lib/Target/Mips/InstPrinter/MipsInstPrinter.cpp
@@ -230,35 +230,26 @@ bool MipsInstPrinter::printAlias(const char *Str, const MCInst &MI,
 bool MipsInstPrinter::printAlias(const MCInst &MI, raw_ostream &OS) {
   switch (MI.getOpcode()) {
   case Mips::BEQ:
-    if (isReg<Mips::ZERO>(MI, 1) && printAlias("beqz", MI, 0, 2, OS))
-      return true;
-    break;
+    // beq $r0, $zero, $L2 => beqz $r0, $L2
+    return isReg<Mips::ZERO>(MI, 1) && printAlias("beqz", MI, 0, 2, OS);
   case Mips::BEQ64:
-    if (isReg<Mips::ZERO_64>(MI, 1) && printAlias("beqz", MI, 0, 2, OS))
-      return true;
-    break;
+    // beq $r0, $zero, $L2 => beqz $r0, $L2
+    return isReg<Mips::ZERO_64>(MI, 1) && printAlias("beqz", MI, 0, 2, OS);
   case Mips::BNE:
-    if (isReg<Mips::ZERO>(MI, 1) && printAlias("bnez", MI, 0, 2, OS))
-      return true;
-    break;
+    // bne $r0, $zero, $L2 => bnez $r0, $L2
+    return isReg<Mips::ZERO>(MI, 1) && printAlias("bnez", MI, 0, 2, OS);
   case Mips::BNE64:
-    if (isReg<Mips::ZERO_64>(MI, 1) && printAlias("bnez", MI, 0, 2, OS))
-      return true;
-    break;
+    // bne $r0, $zero, $L2 => bnez $r0, $L2
+    return isReg<Mips::ZERO_64>(MI, 1) && printAlias("bnez", MI, 0, 2, OS);
   case Mips::BC1T:
-    if (isReg<Mips::FCC0>(MI, 0) && printAlias("bc1t", MI, 1, OS))
-      return true;
-    break;
+    // bc1t $fcc0, $L1 => bc1t $L1
+    return isReg<Mips::FCC0>(MI, 0) && printAlias("bc1t", MI, 1, OS);
   case Mips::BC1F:
-    if (isReg<Mips::FCC0>(MI, 0) && printAlias("bc1f", MI, 1, OS))
-      return true;
-    break;
+    // bc1f $fcc0, $L1 => bc1f $L1
+    return isReg<Mips::FCC0>(MI, 0) && printAlias("bc1f", MI, 1, OS);
   case Mips::OR:
-    if (isReg<Mips::ZERO>(MI, 2) && printAlias("move", MI, 0, 1, OS))
-      return true;
-    break;
+    // or $r0, $r1, $zero => move $r0, $r1
+    return isReg<Mips::ZERO>(MI, 2) && printAlias("move", MI, 0, 1, OS);
   default: return false;
   }
-
-  return false;
 }