[GISel] Pass MD_callees metadata down in call lowering.
Summary:
This will make it possible to improve IPRA by taking into account
register usage in indirect calls.
NFC yet; this is just laying the groundwork to start building
up patches to take advantage of the information for improved register
allocation.
Reviewers: aditya_nandakumar, volkan, qcolombet, arsenm, rovka, aemerson, paquette
Subscribers: sdardis, wdng, javed.absar, hiraditya, jrtc27, atanasyan, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D65488
llvm-svn: 367476
diff --git a/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp b/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
index a5d8205..9f95013 100644
--- a/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
@@ -19,6 +19,7 @@
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Instructions.h"
+#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#define DEBUG_TYPE "call-lowering"
@@ -61,8 +62,11 @@
if (!OrigRet.Ty->isVoidTy())
setArgFlags(OrigRet, AttributeList::ReturnIndex, DL, CS);
+ const MDNode *KnownCallees =
+ CS.getInstruction()->getMetadata(LLVMContext::MD_callees);
+
return lowerCall(MIRBuilder, CS.getCallingConv(), Callee, OrigRet, OrigArgs,
- SwiftErrorVReg);
+ SwiftErrorVReg, KnownCallees);
}
template <typename FuncInfoTy>