[Stackmap] Liveness Analysis Pass
This optional register liveness analysis pass can be enabled with either
-enable-stackmap-liveness, -enable-patchpoint-liveness, or both. The pass
traverses each basic block in a machine function. For each basic block the
instructions are processed in reversed order and if a patchpoint or stackmap
instruction is encountered the current live-out register set is encoded as a
register mask and attached to the instruction.
Later on during stackmap generation the live-out register mask is processed and
also emitted as part of the stackmap.
This information is optional and intended for optimization purposes only. This
will enable a client of the stackmap to reason about the registers it can use
and which registers need to be preserved.
Reviewed by Andy
llvm-svn: 197317
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 1eb590b..e58856f 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -6886,6 +6886,9 @@
DAG.ReplaceAllUsesWith(Call, MN);
DAG.DeleteNode(Call);
+
+ // Inform the Frame Information that we have a stackmap in this function.
+ FuncInfo.MF->getFrameInfo()->setHasStackMap();
}
/// \brief Lower llvm.experimental.patchpoint directly to its target opcode.
@@ -7025,6 +7028,9 @@
} else
DAG.ReplaceAllUsesWith(Call, MN);
DAG.DeleteNode(Call);
+
+ // Inform the Frame Information that we have a patchpoint in this function.
+ FuncInfo.MF->getFrameInfo()->setHasPatchPoint();
}
/// TargetLowering::LowerCallTo - This is the default LowerCallTo