Changes in directory llvm/lib/Transforms/IPO:
DeadArgumentElimination.cpp updated: 1.26 -> 1.27
---
Log message:
Fix Transforms/DeadArgElim/2006-06-27-struct-ret.ll. -deadargelim should not
remove the struct return argument of a csret function, even if it is obviously
dead.
---
Diffs of the changes: (+11 -5)
DeadArgumentElimination.cpp | 16 +++++++++++-----
1 files changed, 11 insertions(+), 5 deletions(-)
Index: llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
diff -u llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp:1.26
llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp:1.27
--- llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp:1.26 Sun Jan 22
17:32:06 2006
+++ llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp Tue Jun 27 16:05:04 2006
@@ -19,15 +19,15 @@
#define DEBUG_TYPE "deadargelim"
#include "llvm/Transforms/IPO.h"
-#include "llvm/Module.h"
-#include "llvm/Pass.h"
-#include "llvm/DerivedTypes.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/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 @@
// (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)
{
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