Support unconditional fall-through branches in FastISel.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55014 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 5a7c896..ab6c80e 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -11,6 +11,7 @@
//
//===----------------------------------------------------------------------===//
+#include "llvm/Instructions.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
@@ -41,6 +42,21 @@
ValueMap[I] = ResultReg;
break;
}
+ case Instruction::Br: {
+ BranchInst *BI = cast<BranchInst>(I);
+
+ // For now, check for and handle just the most trivial case: an
+ // unconditional fall-through branch.
+ if (BI->isUnconditional() &&
+ next(MachineFunction::iterator(MBB))->getBasicBlock() ==
+ BI->getSuccessor(0)) {
+ MBB->addSuccessor(next(MachineFunction::iterator(MBB)));
+ break;
+ }
+
+ // Something more complicated. Halt "fast" selection and bail.
+ return I;
+ }
default:
// Unhandled instruction. Halt "fast" selection and bail.
return I;