From a230262791397c88beeb7ca9bb97c8a8a026e848 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Wed, 15 Feb 2012 23:42:54 +0000 Subject: [PATCH] Handle register masks in branch folding. Don't attempt to move instructions with regmask operands. They are most likely calls anyway. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150634 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/BranchFolding.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp index 4929e388900..6aa170b536e 100644 --- a/lib/CodeGen/BranchFolding.cpp +++ b/lib/CodeGen/BranchFolding.cpp @@ -1477,6 +1477,9 @@ MachineBasicBlock::iterator findHoistingInsertPosAndDeps(MachineBasicBlock *MBB, bool IsDef = false; for (unsigned i = 0, e = PI->getNumOperands(); !IsDef && i != e; ++i) { const MachineOperand &MO = PI->getOperand(i); + // If PI has a regmask operand, it is probably a call. Separate away. + if (MO.isRegMask()) + return Loc; if (!MO.isReg() || MO.isUse()) continue; unsigned Reg = MO.getReg(); @@ -1589,6 +1592,11 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) { bool IsSafe = true; for (unsigned i = 0, e = TIB->getNumOperands(); i != e; ++i) { MachineOperand &MO = TIB->getOperand(i); + // Don't attempt to hoist instructions with register masks. + if (MO.isRegMask()) { + IsSafe = false; + break; + } if (!MO.isReg()) continue; unsigned Reg = MO.getReg(); -- 2.34.1