Import LLVM 8.0.0 release including clang, lld and lldb.

1 files changed, 25 insertions, 6 deletions

diff --git a/gnu/llvm/lib/CodeGen/TargetOptionsImpl.cpp b/gnu/llvm/lib/CodeGen/TargetOptionsImpl.cpp
index 853e71d0efa..3c133fb8594 100644
--- a/gnu/llvm/lib/CodeGen/TargetOptionsImpl.cpp
+++ b/gnu/llvm/lib/CodeGen/TargetOptionsImpl.cpp
@@ -23,15 +23,34 @@ using namespace llvm;
 /// DisableFramePointerElim - This returns true if frame pointer elimination
 /// optimization should be disabled for the given machine function.
 bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
-  // Check to see if we should eliminate all frame pointers.
-  if (MF.getSubtarget().getFrameLowering()->noFramePointerElim(MF))
+  // Check to see if the target want to forcably keep frame pointer.
+  if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF))
     return true;
 
-  // Check to see if we should eliminate non-leaf frame pointers.
-  if (MF.getFunction().hasFnAttribute("no-frame-pointer-elim-non-leaf"))
-    return MF.getFrameInfo().hasCalls();
+  const Function &F = MF.getFunction();
+
+  // TODO: Remove support for old `fp elim` function attributes after fully
+  //       migrate to use "frame-pointer"
+  if (!F.hasFnAttribute("frame-pointer")) {
+    // Check to see if we should eliminate all frame pointers.
+    if (F.getFnAttribute("no-frame-pointer-elim").getValueAsString() == "true")
+      return true;
+
+    // Check to see if we should eliminate non-leaf frame pointers.
+    if (F.hasFnAttribute("no-frame-pointer-elim-non-leaf"))
+      return MF.getFrameInfo().hasCalls();
 
-  return false;
+    return false;
+  }
+
+  StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString();
+  if (FP == "all")
+    return true;
+  if (FP == "non-leaf")
+    return MF.getFrameInfo().hasCalls();
+  if (FP == "none")
+    return false;
+  llvm_unreachable("unknown frame pointer flag");
 }
 
 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume