From 244588820867ab4e42f72c266196b848919bfebb Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Thu, 10 Jan 2008 22:35:15 +0000 Subject: [PATCH] Clamp down on sinking of lots of instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45841 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/MachineSink.cpp | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/lib/CodeGen/MachineSink.cpp b/lib/CodeGen/MachineSink.cpp index c832f0a65c8..b83d844a162 100644 --- a/lib/CodeGen/MachineSink.cpp +++ b/lib/CodeGen/MachineSink.cpp @@ -130,6 +130,15 @@ bool MachineSinking::ProcessBlock(MachineBasicBlock &MBB) { /// SinkInstruction - Determine whether it is safe to sink the specified machine /// instruction out of its current block into a successor. bool MachineSinking::SinkInstruction(MachineInstr *MI) { + const TargetInstrDesc &TID = MI->getDesc(); + + // Ignore stuff that we obviously can't sink. + if (TID.mayStore() || TID.isCall() || TID.isReturn() || TID.isBranch()) + return false; + + if (TID.mayLoad()) + return false; + // Don't sink things with side-effects we don't understand. if (TII->hasUnmodelledSideEffects(MI)) return false; -- 2.34.1