diff options
Diffstat (limited to 'llvm/lib/CodeGen/MachineCSE.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCSE.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp index 199fe2d..de90d0f 100644 --- a/llvm/lib/CodeGen/MachineCSE.cpp +++ b/llvm/lib/CodeGen/MachineCSE.cpp @@ -433,6 +433,11 @@ bool MachineCSE::isProfitableToCSE(Register CSReg, Register Reg, MachineBasicBlock *CSBB, MachineInstr *MI) { // FIXME: Heuristics that works around the lack the live range splitting. + MachineBasicBlock *BB = MI->getParent(); + // Prevent CSE-ing non-local convergent instructions. + if (MI->isConvergent() && CSBB != BB) + return false; + // If CSReg is used at all uses of Reg, CSE should not increase register // pressure of CSReg. bool MayIncreasePressure = true; @@ -455,7 +460,6 @@ bool MachineCSE::isProfitableToCSE(Register CSReg, Register Reg, // an immediate predecessor. We don't want to increase register pressure and // end up causing other computation to be spilled. if (TII->isAsCheapAsAMove(*MI)) { - MachineBasicBlock *BB = MI->getParent(); if (CSBB != BB && !CSBB->isSuccessor(BB)) return false; } |