diff options
Diffstat (limited to 'llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp')
| -rw-r--r-- | llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp b/llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp index 4154b9cc9c9..c391b166488 100644 --- a/llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp +++ b/llvm/lib/Target/Lanai/LanaiDelaySlotFiller.cpp @@ -238,6 +238,13 @@ void Filler::insertDefsUses(MachineBasicBlock::instr_iterator MI, else if (MO.isUse()) RegUses.insert(Reg); } + + // Call & return instructions defines SP implicitly. Implicit defines are not + // included in the RegDefs set of calls but instructions modifying SP cannot + // be inserted in the delay slot of a call/return as these instructions are + // expanded to multiple instructions with SP modified before the branch that + // has the delay slot. + if (MI->isCall() || MI->isReturn()) RegDefs.insert(Lanai::SP); } // Returns true if the Reg or its alias is in the RegSet. |
