FastISel support for debug info.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56610 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index ac4a639..b9f1aa4 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -246,7 +246,9 @@
static bool isOnlyUsedInEntryBlock(Argument *A, bool EnableFastISel) {
// With FastISel active, we may be splitting blocks, so force creation
// of virtual registers for all non-dead arguments.
- if (EnableFastISel)
+ // Don't force virtual registers for byval arguments though, because
+ // fast-isel can't handle those in all cases.
+ if (EnableFastISel && !A->hasByValAttr())
return A->use_empty();
BasicBlock *Entry = A->getParent()->begin();