From 00f185fbfd99d21cda394eded77d1bc0ea2a4073 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Wed, 23 Jul 2003 03:32:41 +0000 Subject: [PATCH] Fix bug: TailDup/2003-07-22-InfiniteLoop.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7243 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Scalar/TailDuplication.cpp | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/Transforms/Scalar/TailDuplication.cpp b/lib/Transforms/Scalar/TailDuplication.cpp index 04736f07e14..eea2096a9ef 100644 --- a/lib/Transforms/Scalar/TailDuplication.cpp +++ b/lib/Transforms/Scalar/TailDuplication.cpp @@ -76,6 +76,11 @@ bool TailDup::shouldEliminateUnconditionalBranch(TerminatorInst *TI) { BasicBlock *Dest = BI->getSuccessor(0); if (Dest == BI->getParent()) return false; // Do not loop infinitely! + // Do not inline a block if we will just get another branch to the same block! + if (BranchInst *DBI = dyn_cast(Dest->getTerminator())) + if (DBI->isUnconditional() && DBI->getSuccessor(0) == Dest) + return false; // Do not loop infinitely! + // Do not bother working on dead blocks... pred_iterator PI = pred_begin(Dest), PE = pred_end(Dest); if (PI == PE && Dest != Dest->getParent()->begin()) -- 2.34.1