After reducing a miscompiled program down to the functions which are being

miscompiled, try to use the loop extractor to reduce the program down to a
loop nest that is being miscompiled.  In practice, the loop extractor appears
to have too many bugs for this to be useful, but hopefully they will be fixed
soon...

llvm-svn: 12398

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/tools/bugpoint/ExtractFunction.cpp b/llvm/tools/bugpoint/ExtractFunction.cpp
index 53afd474fdd..e8fe499ffdd 100644
--- a/llvm/tools/bugpoint/ExtractFunction.cpp
+++ b/llvm/tools/bugpoint/ExtractFunction.cpp
@@ -131,7 +131,11 @@ Module *BugDriver::ExtractLoop(Module *M) {
 
   Module *NewM = runPassesOn(M, LoopExtractPasses);
   if (NewM == 0) {
-    std::cerr << "Loop extraction failed.  Sorry. :(  Please report a bug!\n";
+    Module *Old = swapProgramIn(M);
+    std::cout << "*** Loop extraction failed: ";
+    EmitProgressBytecode("loopextraction", true);
+    std::cout << "*** Sorry. :(  Please report a bug!\n";
+    swapProgramIn(Old);
     return 0;
   }