From: Duncan P. N. Exon Smith <dexonsmith@apple.com>
Date: Mon, 6 Oct 2014 17:42:00 +0000 (+0000)
Subject: BFI: Improve assertion message, since it's actually firing
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7609712017ee517ffc381ca0a68c9af506633a02;p=oota-llvm.git

BFI: Improve assertion message, since it's actually firing

This assertion is firing because -loop-unroll is failing to preserve
-loop-info (see PR20987).  Improve it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219130 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/BlockFrequencyInfoImpl.cpp b/lib/Analysis/BlockFrequencyInfoImpl.cpp
index 3203c371648..d132c23b0f6 100644
--- a/lib/Analysis/BlockFrequencyInfoImpl.cpp
+++ b/lib/Analysis/BlockFrequencyInfoImpl.cpp
@@ -602,7 +602,8 @@ static void findIrreducibleHeaders(
       break;
     }
   }
-  assert(Headers.size() >= 2 && "Should be irreducible");
+  assert(Headers.size() >= 2 &&
+         "Expected irreducible CFG; -loop-info is likely invalid");
   if (Headers.size() == InSCC.size()) {
     // Every block is a header.
     std::sort(Headers.begin(), Headers.end());