[GlobalISel] Teach the core pipeline not to run if ISel failed.

llvm-svn: 279889

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp b/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp
index bf88d742dba..9efe48adec7 100644
--- a/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp
@@ -537,6 +537,11 @@ void RegBankSelect::assignInstr(MachineInstr &MI) {
 }
 
 bool RegBankSelect::runOnMachineFunction(MachineFunction &MF) {
+  // If the ISel pipeline failed, do not bother running that pass.
+  if (MF.getProperties().hasProperty(
+          MachineFunctionProperties::Property::FailedISel))
+    return false;
+
   DEBUG(dbgs() << "Assign register banks for: " << MF.getName() << '\n');
   const Function *F = MF.getFunction();
   Mode SaveOptMode = OptMode;