[NFC][ARM] Refactor macro fusion

Simplify code for wildcards.

llvm-svn: 344625

1 files changed, 5 insertions, 19 deletions

diff --git a/llvm/lib/Target/ARM/ARMMacroFusion.cpp b/llvm/lib/Target/ARM/ARMMacroFusion.cpp
index d11fe9d5c50..df1da9d8e47 100644
--- a/llvm/lib/Target/ARM/ARMMacroFusion.cpp
+++ b/llvm/lib/Target/ARM/ARMMacroFusion.cpp
@@ -23,20 +23,13 @@ namespace llvm {
 static bool isAESPair(const MachineInstr *FirstMI,
                       const MachineInstr &SecondMI) {
   // Assume the 1st instr to be a wildcard if it is unspecified.
-  unsigned FirstOpcode =
-      FirstMI ? FirstMI->getOpcode()
-              : static_cast<unsigned>(ARM::INSTRUCTION_LIST_END);
-  unsigned SecondOpcode = SecondMI.getOpcode();
-
-  switch(SecondOpcode) {
+  switch(SecondMI.getOpcode()) {
   // AES encode.
   case ARM::AESMC :
-    return FirstOpcode == ARM::AESE ||
-           FirstOpcode == ARM::INSTRUCTION_LIST_END;
+    return FirstMI == nullptr || FirstMI->getOpcode() == ARM::AESE;
   // AES decode.
   case ARM::AESIMC:
-    return FirstOpcode == ARM::AESD ||
-           FirstOpcode == ARM::INSTRUCTION_LIST_END;
+    return FirstMI == nullptr || FirstMI->getOpcode() == ARM::AESD;
   }
 
   return false;
@@ -46,15 +39,8 @@ static bool isAESPair(const MachineInstr *FirstMI,
 static bool isLiteralsPair(const MachineInstr *FirstMI,
                            const MachineInstr &SecondMI) {
   // Assume the 1st instr to be a wildcard if it is unspecified.
-  unsigned FirstOpcode =
-      FirstMI ? FirstMI->getOpcode()
-              : static_cast<unsigned>(ARM::INSTRUCTION_LIST_END);
-  unsigned SecondOpcode = SecondMI.getOpcode();
-
-  // 32 bit immediate.
-  if ((FirstOpcode == ARM::INSTRUCTION_LIST_END ||
-       FirstOpcode == ARM::MOVi16) &&
-      SecondOpcode == ARM::MOVTi16)
+  if ((FirstMI == nullptr || FirstMI->getOpcode() == ARM::MOVi16) &&
+      SecondMI.getOpcode() == ARM::MOVTi16)
     return true;
 
   return false;