From 6165dba25f3374ce340b420ab9a360623c26fdc3 Mon Sep 17 00:00:00 2001 From: Nadav Rotem Date: Mon, 10 Sep 2012 18:51:09 +0000 Subject: Stack Coloring: Handle the case where END markers come before BEGIN markers properly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163530 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/StackColoring.cpp | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'lib/CodeGen/StackColoring.cpp') diff --git a/lib/CodeGen/StackColoring.cpp b/lib/CodeGen/StackColoring.cpp index 462a134ace..927ecef171 100644 --- a/lib/CodeGen/StackColoring.cpp +++ b/lib/CodeGen/StackColoring.cpp @@ -315,6 +315,18 @@ void StackColoring::calculateLocalLiveness() { LocalLiveOut.reset(BlockLiveness[BB].End); LocalLiveIn.reset(BlockLiveness[BB].Begin); + // If we have both BEGIN and END markers in the same basic block then + // we know that the BEGIN marker comes after the END, because we already + // handle the case where the BEGIN comes before the END when collecting + // the markers (and building the BEGIN/END vectore). + // Want to enable the LIVE_IN and LIVE_OUT of slots that have both + // BEGIN and END because it means that the value lives before and after + // this basic block. + BitVector LocalEndBegin = BlockLiveness[BB].End; + LocalEndBegin &= BlockLiveness[BB].Begin; + LocalLiveIn |= LocalEndBegin; + LocalLiveOut |= LocalEndBegin; + if (LocalLiveIn.test(BlockLiveness[BB].LiveIn)) { changed = true; BlockLiveness[BB].LiveIn |= LocalLiveIn; -- cgit v1.2.3