From 654c98c4f39591132027835a52dee4993618de51 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Fri, 20 Mar 2009 01:28:21 +0000 Subject: [PATCH] The last use in a block that doesn't have successors (return or unreachable) is a kill. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67357 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Analysis/LiveValues.cpp | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/Analysis/LiveValues.cpp b/lib/Analysis/LiveValues.cpp index 2634463df20..21ddf6bc363 100644 --- a/lib/Analysis/LiveValues.cpp +++ b/lib/Analysis/LiveValues.cpp @@ -131,6 +131,11 @@ LiveValues::Memo &LiveValues::compute(const Value *V) { // Note the block in which this use occurs. M.Used.insert(UseBB); + // If the use block doesn't have successors, the value can be + // considered killed. + if (succ_begin(UseBB) == succ_end(UseBB)) + M.Killed.insert(UseBB); + // Observe whether the value is used outside of the loop in which // it is defined. Switch to an enclosing loop if necessary. for (; L; L = L->getParentLoop())