[X86] Fix -Wsometimes-uninitialized in X86InstrInfo.cpp (NFC)

/data/llvm-project/llvm/lib/Target/X86/X86InstrInfo.cpp:9793:3: error: variable 'MaddOpc' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
  default:
  ^~~~~~~
/data/llvm-project/llvm/lib/Target/X86/X86InstrInfo.cpp:9854:25: note: uninitialized use occurs here
  Madd->setDesc(TII.get(MaddOpc));
                        ^~~~~~~
/data/llvm-project/llvm/lib/Target/X86/X86InstrInfo.cpp:9791:19: note: initialize the variable 'MaddOpc' to silence this warning
  unsigned MaddOpc;
                  ^
                   = 0
/data/llvm-project/llvm/lib/Target/X86/X86InstrInfo.cpp:9793:3: error: variable 'AddOpc' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
  default:
  ^~~~~~~
/data/llvm-project/llvm/lib/Target/X86/X86InstrInfo.cpp:9862:46: note: uninitialized use occurs here
      BuildMI(*MF, MIMetadata(Root), TII.get(AddOpc), DstReg)
                                             ^~~~~~
/data/llvm-project/llvm/lib/Target/X86/X86InstrInfo.cpp:9790:18: note: initialize the variable 'AddOpc' to silence this warning
  unsigned AddOpc;
                 ^
                  = 0
2 errors generated.

diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp
index 2ee9ab6f95f34167566e37e3fc78484de49a6040..c499410928cb73db7ce14674c7a3f95f762a5d8c 100644 (file)
--- a/llvm/lib/Target/X86/X86InstrInfo.cpp
+++ b/llvm/lib/Target/X86/X86InstrInfo.cpp
@@ -9787,8 +9787,8 @@ genAlternativeDpCodeSequence(MachineInstr &Root, const TargetInstrInfo &TII,
   MachineRegisterInfo &RegInfo = MF->getRegInfo();
 
   unsigned Opc = Root.getOpcode();
-  unsigned AddOpc;
-  unsigned MaddOpc;
+  unsigned AddOpc = 0;
+  unsigned MaddOpc = 0;
   switch (Opc) {
   default:
     assert("It should not reach here");