From c556fcc153a727945dbbe222a5b7c1dfce141a33 Mon Sep 17 00:00:00 2001 From: Michel Danzer Date: Thu, 14 Feb 2013 08:00:33 +0000 Subject: [PATCH] R600/SI: Check for empty stack in SIAnnotateControlFlow::isTopOfStack Fixes assertion failure in newly added lit test. Might just be a bandaid that needs to be revisited. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175139 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/R600/SIAnnotateControlFlow.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/Target/R600/SIAnnotateControlFlow.cpp b/lib/Target/R600/SIAnnotateControlFlow.cpp index f5803774186..2477e2a9dcc 100644 --- a/lib/Target/R600/SIAnnotateControlFlow.cpp +++ b/lib/Target/R600/SIAnnotateControlFlow.cpp @@ -147,7 +147,7 @@ bool SIAnnotateControlFlow::doInitialization(Module &M) { /// \brief Is BB the last block saved on the stack ? bool SIAnnotateControlFlow::isTopOfStack(BasicBlock *BB) { - return Stack.back().first == BB; + return !Stack.empty() && Stack.back().first == BB; } /// \brief Pop the last saved value from the control flow stack