[Sparc] Implements hasReservedCallFrame and hasFP.

 This is to generate correct framesetup code when the function
 has variable sized allocas.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182108 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 33 insertions, 1 deletions

diff --git a/lib/Target/Sparc/SparcFrameLowering.cpp b/lib/Target/Sparc/SparcFrameLowering.cpp
index 7874240..afa8411 100644
--- a/lib/Target/Sparc/SparcFrameLowering.cpp
+++ b/lib/Target/Sparc/SparcFrameLowering.cpp
@@ -106,3 +106,18 @@ void SparcFrameLowering::emitEpilogue(MachineFunction &MF,
   BuildMI(MBB, MBBI, dl, TII.get(SP::RESTORErr), SP::G0).addReg(SP::G0)
     .addReg(SP::G0);
 }
+
+bool SparcFrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
+  //Reserve call frame if there are no variable sized objects on the stack
+  return !MF.getFrameInfo()->hasVarSizedObjects();
+}
+
+// hasFP - Return true if the specified function should have a dedicated frame
+// pointer register.  This is true if the function has variable sized allocas or
+// if frame pointer elimination is disabled.
+bool SparcFrameLowering::hasFP(const MachineFunction &MF) const {
+  const MachineFrameInfo *MFI = MF.getFrameInfo();
+  return MF.getTarget().Options.DisableFramePointerElim(MF) ||
+    MFI->hasVarSizedObjects() || MFI->isFrameAddressTaken();
+}
+
diff --git a/lib/Target/Sparc/SparcFrameLowering.h b/lib/Target/Sparc/SparcFrameLowering.h
index c375662..4a3cef7 100644
--- a/lib/Target/Sparc/SparcFrameLowering.h
+++ b/lib/Target/Sparc/SparcFrameLowering.h
@@ -38,7 +38,8 @@ public:
                                      MachineBasicBlock &MBB,
                                      MachineBasicBlock::iterator I) const;
 
-  bool hasFP(const MachineFunction &MF) const { return false; }
+  bool hasReservedCallFrame(const MachineFunction &MF) const;
+  bool hasFP(const MachineFunction &MF) const;
 };
 
 } // End llvm namespace
diff --git a/test/CodeGen/SPARC/2013-05-17-CallFrame.ll b/test/CodeGen/SPARC/2013-05-17-CallFrame.ll
new file mode 100644
index 0000000..9e9e821
--- /dev/null
+++ b/test/CodeGen/SPARC/2013-05-17-CallFrame.ll
@@ -0,0 +1,16 @@
+; RUN: llc -march=sparc < %s | FileCheck %s
+
+; CHECK: variable_alloca_with_adj_call_stack
+; CHECK: save %sp, -96, %sp
+; CHECK: add %sp, -16, %sp
+; CHECK: call foo
+; CHECK: add %sp, 16, %sp
+define void @variable_alloca_with_adj_call_stack(i32 %num) {
+entry:
+  %0 = alloca i8, i32 %num, align 8
+  call void @foo(i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0, i8* %0)
+  ret void
+}
+
+
+declare void @foo(i8* , i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*, i8*);