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Fix Transforms/DeadArgElim/2006-06-27-struct-ret.ll. -deadargelim should not

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remove the struct return argument of a csret function, even if it is obviously
dead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28943 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-06-27 21:05:04 +00:00
parent a60af32287
commit 92044ce4e9
1 changed files with 11 additions and 5 deletions
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16
lib/Transforms/IPO/DeadArgumentElimination.cpp
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@ -19,15 +19,15 @@
#define DEBUG_TYPE "deadargelim"
#include "llvm/Transforms/IPO.h"
#include "llvm/CallingConv.h"
#include "llvm/Constant.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Constant.h"
#include "llvm/Instructions.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/iterator"
#include <iostream>
#include <set>
using namespace llvm;
@ -128,7 +128,13 @@ static inline bool CallPassesValueThoughVararg(Instruction *Call,
// (used in a computation), MaybeLive (only passed as an argument to a call), or
// Dead (not used).
DAE::Liveness DAE::getArgumentLiveness(const Argument &A) {
if (A.use_empty()) return Dead; // First check, directly dead?
// If this is the return value of a csret function, it's not really dead.
if (A.getParent()->getCallingConv() == CallingConv::CSRet &&
&*A.getParent()->arg_begin() == &A)
return Live;
if (A.use_empty()) // First check, directly dead?
return Dead;
// Scan through all of the uses, looking for non-argument passing uses.
for (Value::use_const_iterator I = A.use_begin(), E = A.use_end(); I!=E;++I) {