From 6b88c180dad5eaa8361c5de2fa01c997f4f83368 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Fri, 20 Jan 2012 22:27:09 +0000 Subject: [PATCH] Handle register masks in DeadMachineInstructionElim. Don't track live physregs that are clobbered by a register mask operand. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148588 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/DeadMachineInstructionElim.cpp | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp index ba135e19f4d..aeb0b3ed022 100644 --- a/lib/CodeGen/DeadMachineInstructionElim.cpp +++ b/lib/CodeGen/DeadMachineInstructionElim.cpp @@ -173,6 +173,13 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) { *SubRegs; ++SubRegs) LivePhysRegs.reset(*SubRegs); } + } else if (MO.isRegMask()) { + // Register mask of preserved registers. All clobbers are dead. + if (const uint32_t *Mask = MO.getRegMask()) + LivePhysRegs.clearBitsNotInMask(Mask); + else + LivePhysRegs.reset(); + LivePhysRegs |= ReservedRegs; } } // Record the physreg uses, after the defs, in case a physreg is