From b6e0631a942d83947eec7808e643e17648a08da5 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 5 Nov 2003 21:53:41 +0000
Subject: [PATCH] Fix the problem with running cleanups in bugpoint:  We were
 deleting arguments of intrinsic functions, causing the verifier to fail.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9745 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/IPO/DeadArgumentElimination.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/Transforms/IPO/DeadArgumentElimination.cpp b/lib/Transforms/IPO/DeadArgumentElimination.cpp
index 265c6267602..9003f8877f7 100644
--- a/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ b/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -99,6 +99,8 @@ namespace {
   struct DAH : public DAE {
     virtual bool ShouldHackArguments() const { return true; }
   };
+  RegisterPass<DAH> Y("deadarghaX0r",
+                      "Dead Argument Hacking (bugpoint usage only)");
 }
 
 /// createDeadArgEliminationPass - This pass removes arguments from functions
@@ -163,7 +165,8 @@ void DAE::SurveyFunction(Function &F) {
   bool FunctionIntrinsicallyLive = false;
   Liveness RetValLiveness = F.getReturnType() == Type::VoidTy ? Live : Dead;
 
-  if (!F.hasInternalLinkage() && !ShouldHackArguments()) 
+  if (!F.hasInternalLinkage() &&
+      (!ShouldHackArguments() || F.getIntrinsicID()))
     FunctionIntrinsicallyLive = true;
   else 
     for (Value::use_iterator I = F.use_begin(), E = F.use_end(); I != E; ++I) {