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

llvm-svn: 279889

3 files changed, 14 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/InstructionSelect.cpp b/llvm/lib/CodeGen/GlobalISel/InstructionSelect.cpp
index 4ef4c43f763..302c3763d00 100644
--- a/llvm/lib/CodeGen/GlobalISel/InstructionSelect.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/InstructionSelect.cpp
@@ -43,6 +43,11 @@ static void reportSelectionError(const MachineInstr &MI, const Twine &Message) {
 }
 
 bool InstructionSelect::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() << "Selecting function: " << MF.getName() << '\n');
 
   const InstructionSelector *ISel = MF.getSubtarget().getInstructionSelector();
diff --git a/llvm/lib/CodeGen/GlobalISel/MachineLegalizePass.cpp b/llvm/lib/CodeGen/GlobalISel/MachineLegalizePass.cpp
index bf5025201ba..33d050bbcc6 100644
--- a/llvm/lib/CodeGen/GlobalISel/MachineLegalizePass.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/MachineLegalizePass.cpp
@@ -37,6 +37,10 @@ void MachineLegalizePass::init(MachineFunction &MF) {
 }
 
 bool MachineLegalizePass::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() << "Legalize Machine IR for: " << MF.getName() << '\n');
   init(MF);
   const MachineLegalizer &Legalizer = *MF.getSubtarget().getMachineLegalizer();
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;