[StackMaps] Mark in CallLoweringInfo when lowering a patchpoint

While, generally speaking, the process of lowering arguments for a patchpoint
is the same as lowering a regular indirect call, on some targets it may not be
exactly the same. Targets may not, for example, want to add additional register
dependencies that apply only to making cross-DSO calls through linker stubs,
may not want to load additional registers out of function descriptors, and may
not want to add additional side-effect-causing instructions that cannot be
removed later with the call itself being generated.

The PowerPC target will use this in a future commit (for all of the reasons
stated above).

llvm-svn: 225806

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index 8facbc28e40..c87a0854db6 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -728,6 +728,7 @@ bool FastISel::selectPatchpoint(const CallInst *I) {
   // For AnyRegCC the arguments are lowered later on manually.
   unsigned NumCallArgs = IsAnyRegCC ? 0 : NumArgs;
   CallLoweringInfo CLI;
+  CLI.setIsPatchPoint();
   if (!lowerCallOperands(I, NumMetaOpers, NumCallArgs, Callee, IsAnyRegCC, CLI))
     return false;