[GlobalISel] Don't legalize non-generic instructions.

They don't have types and should be legal.

llvm-svn: 277446

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/MachineLegalizePass.cpp b/llvm/lib/CodeGen/GlobalISel/MachineLegalizePass.cpp
index 0b8264f613d..bf5025201ba 100644
--- a/llvm/lib/CodeGen/GlobalISel/MachineLegalizePass.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/MachineLegalizePass.cpp
@@ -54,6 +54,12 @@ bool MachineLegalizePass::runOnMachineFunction(MachineFunction &MF) {
       // Get the next Instruction before we try to legalize, because there's a
       // good chance MI will be deleted.
       NextMI = std::next(MI);
+
+      // Only legalize pre-isel generic instructions: others don't have types
+      // and are assumed to be legal.
+      if (!isPreISelGenericOpcode(MI->getOpcode()))
+        continue;
+
       auto Res = Helper.legalizeInstr(*MI, Legalizer);
 
       // Error out if we couldn't legalize this instruction. We may want to fall