From: Chris Lattner <sabre@nondot.org>
Date: Tue, 9 Nov 2004 20:47:30 +0000 (+0000)
Subject: Do not let dead constant expressions hanging off of functions prevent IPCP.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c890bfe1da56e3740d633559f3ea9bd33ee6d2f7;p=oota-llvm.git

Do not let dead constant expressions hanging off of functions prevent IPCP.
This allows to elimination of a bunch of global pool descriptor args from
programs being pool allocated (and is also generally useful!)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17657 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/IPO/IPConstantPropagation.cpp b/lib/Transforms/IPO/IPConstantPropagation.cpp
index 64d1df8354a..a1e09e6beff 100644
--- a/lib/Transforms/IPO/IPConstantPropagation.cpp
+++ b/lib/Transforms/IPO/IPConstantPropagation.cpp
@@ -62,6 +62,9 @@ bool IPCP::runOnModule(Module &M) {
 bool IPCP::processFunction(Function &F) {
   if (F.aempty() || F.use_empty()) return false;  // No arguments?  Early exit.
 
+  // Delete any klingons.
+  F.removeDeadConstantUsers();
+
   std::vector<std::pair<Constant*, bool> > ArgumentConstants;
   ArgumentConstants.resize(F.asize());