Move the dominator verification code out of special code embedded within

the PassManager code into a regular verifyAnalysis method.

Also, reorganize loop verification. Make the LoopPass infrastructure
call verifyLoop as needed instead of having LoopInfo::verifyAnalysis
check every loop in the function after each looop pass. Add a new
command-line argument, -verify-loop-info, to enable the expensive
full checking.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82952 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/LoopPass.cpp

@@ -242,16 +242,24 @@ bool LPPassManager::runOnFunction(Function &F) {
         dumpPassInfo(P, MODIFICATION_MSG, ON_LOOP_MSG, "");
       dumpPreservedSet(P);
 
-      if (!skipThisLoop)
+      if (!skipThisLoop) {
+        // Manually check that this loop is still healthy. This is done
+        // instead of relying on LoopInfo::verifyLoop since LoopInfo
+        // is a function pass and it's really expensive to verify every
+        // loop in the function every time. That level of checking can be
+        // enabled with the -verify-loop-info option.
+        Timer *T = StartPassTimer(LI);
+        CurrentLoop->verifyLoop();
+        StopPassTimer(LI, T);
+
+        // Then call the regular verifyAnalysis functions.
         verifyPreservedAnalysis(LP);
+      }
 
       removeNotPreservedAnalysis(P);
       recordAvailableAnalysis(P);
       removeDeadPasses(P, "", ON_LOOP_MSG);
 
-      // If dominator information is available then verify the info if requested.
-      verifyDomInfo(*LP, F);
-
       if (skipThisLoop)
         // Do not run other passes on this loop.
         break;