GlobalISel: avoid looking too closely at PHIs when we bail.

The function used to finish off PHIs by adding the relevant basic blocks can
fail if we're aborting and still don't actually have the needed
MachineBasicBlocks. So avoid trying in that case.

llvm-svn: 288727

1 files changed, 11 insertions, 9 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index 68fec1a555f..c986e65049f 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -678,8 +678,6 @@ void IRTranslator::finishPendingPhis() {
       MIB.addMBB(BBToMBB[PI->getIncomingBlock(i)]);
     }
   }
-
-  PendingPHIs.clear();
 }
 
 bool IRTranslator::translate(const Instruction &Inst) {
@@ -725,10 +723,9 @@ bool IRTranslator::translate(const Constant &C, unsigned Reg) {
 }
 
 void IRTranslator::finalizeFunction() {
-  finishPendingPhis();
-
   // Release the memory used by the different maps we
   // needed during the translation.
+  PendingPHIs.clear();
   ValToVReg.clear();
   FrameIndices.clear();
   Constants.clear();
@@ -758,6 +755,7 @@ bool IRTranslator::runOnMachineFunction(MachineFunction &MF) {
     if (!TPC->isGlobalISelAbortEnabled()) {
       MIRBuilder.getMF().getProperties().set(
           MachineFunctionProperties::Property::FailedISel);
+      finalizeFunction();
       return false;
     }
     report_fatal_error("Unable to lower arguments");
@@ -777,7 +775,7 @@ bool IRTranslator::runOnMachineFunction(MachineFunction &MF) {
     MIRBuilder.setMBB(MBB);
 
     for (const Instruction &Inst: BB) {
-      bool Succeeded = translate(Inst);
+      Succeeded &= translate(Inst);
       if (!Succeeded) {
         if (TPC->isGlobalISelAbortEnabled())
           reportTranslationError(Inst, "unable to translate instruction");
@@ -787,11 +785,15 @@ bool IRTranslator::runOnMachineFunction(MachineFunction &MF) {
     }
   }
 
-  finalizeFunction();
+  if (Succeeded) {
+    finishPendingPhis();
+
+    // Now that the MachineFrameInfo has been configured, no further changes to
+    // the reserved registers are possible.
+    MRI->freezeReservedRegs(MF);
+  }
 
-  // Now that the MachineFrameInfo has been configured, no further changes to
-  // the reserved registers are possible.
-  MRI->freezeReservedRegs(MF);
+  finalizeFunction();
 
   return false;
 }