[Sparc] Prevent instructions that defines or uses %o7 to be in call's delay slot.

llvm-svn: 182063

1 files changed, 9 insertions, 5 deletions

diff --git a/llvm/lib/Target/Sparc/DelaySlotFiller.cpp b/llvm/lib/Target/Sparc/DelaySlotFiller.cpp
index 6123773d5f4..db3f15900bb 100644
--- a/llvm/lib/Target/Sparc/DelaySlotFiller.cpp
+++ b/llvm/lib/Target/Sparc/DelaySlotFiller.cpp
@@ -61,8 +61,9 @@ namespace {
     bool isDelayFiller(MachineBasicBlock &MBB,
                        MachineBasicBlock::iterator candidate);
 
-    void insertCallUses(MachineBasicBlock::iterator MI,
-                        SmallSet<unsigned, 32>& RegUses);
+    void insertCallDefsUses(MachineBasicBlock::iterator MI,
+                            SmallSet<unsigned, 32>& RegDefs,
+                            SmallSet<unsigned, 32>& RegUses);
 
     void insertDefsUses(MachineBasicBlock::iterator MI,
                         SmallSet<unsigned, 32>& RegDefs,
@@ -150,7 +151,7 @@ Filler::findDelayInstr(MachineBasicBlock &MBB,
 
   //Call's delay filler can def some of call's uses.
   if (slot->isCall())
-    insertCallUses(slot, RegUses);
+    insertCallDefsUses(slot, RegDefs, RegUses);
   else
     insertDefsUses(slot, RegDefs, RegUses);
 
@@ -230,9 +231,12 @@ bool Filler::delayHasHazard(MachineBasicBlock::iterator candidate,
 }
 
 
-void Filler::insertCallUses(MachineBasicBlock::iterator MI,
-                            SmallSet<unsigned, 32>& RegUses)
+void Filler::insertCallDefsUses(MachineBasicBlock::iterator MI,
+                                SmallSet<unsigned, 32>& RegDefs,
+                                SmallSet<unsigned, 32>& RegUses)
 {
+  //Call defines o7, which is visible to the instruction in delay slot.
+  RegDefs.insert(SP::O7);
 
   switch(MI->getOpcode()) {
   default: llvm_unreachable("Unknown opcode.");