[Stackmap] Add AnyReg calling convention support for patchpoint intrinsic.

The idea of the AnyReg Calling Convention is to provide the call arguments in
registers, but not to force them to be placed in a paticular order into a
specified set of registers. Instead it is up tp the register allocator to assign
any register as it sees fit. The same applies to the return value (if
applicable).

Differential Revision: http://llvm-reviews.chandlerc.com/D2009

Reviewed by Andy

llvm-svn: 194293

1 files changed, 12 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/StackMaps.cpp b/llvm/lib/CodeGen/StackMaps.cpp
index 51580b479d8..89da78294fc 100644
--- a/llvm/lib/CodeGen/StackMaps.cpp
+++ b/llvm/lib/CodeGen/StackMaps.cpp
@@ -30,7 +30,8 @@ using namespace llvm;
 
 void StackMaps::recordStackMap(const MachineInstr &MI, uint32_t ID,
                                MachineInstr::const_mop_iterator MOI,
-                               MachineInstr::const_mop_iterator MOE) {
+                               MachineInstr::const_mop_iterator MOE,
+                               bool recordResult) {
 
   MCContext &OutContext = AP.OutStreamer.getContext();
   MCSymbol *MILabel = OutContext.CreateTempSymbol();
@@ -38,6 +39,16 @@ void StackMaps::recordStackMap(const MachineInstr &MI, uint32_t ID,
 
   LocationVec CallsiteLocs;
 
+  if (recordResult) {
+    std::pair<Location, MachineInstr::const_mop_iterator> ParseResult =
+      OpParser(MI.operands_begin(), llvm::next(MI.operands_begin(), 1));
+
+    Location &Loc = ParseResult.first;
+    assert(Loc.LocType == Location::Register &&
+           "Stackmap return location must be a register.");
+    CallsiteLocs.push_back(Loc);
+  }
+
   while (MOI != MOE) {
     std::pair<Location, MachineInstr::const_mop_iterator> ParseResult =
       OpParser(MOI, MOE);