From ffe2eb0120e52db74746b7e5117f8ffd80f1348f Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Tue, 1 Apr 2008 23:26:12 +0000 Subject: [PATCH] ReMat of load from stub in pic mode extends the life of pic base. Currently spiller doesn't do a good job of estimating the impact. Disable for now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49059 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86InstrInfo.cpp | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp index ffe20833228..c9de586e78d 100644 --- a/lib/Target/X86/X86InstrInfo.cpp +++ b/lib/Target/X86/X86InstrInfo.cpp @@ -37,6 +37,10 @@ namespace { cl::desc("Print instructions that the allocator wants to" " fuse, but the X86 backend currently can't"), cl::Hidden); + cl::opt + ReMatPICStubLoad("remat-pic-stub-load", + cl::desc("Re-materialize load from stub in PIC mode"), + cl::init(false), cl::Hidden); } X86InstrInfo::X86InstrInfo(X86TargetMachine &tm) @@ -782,6 +786,8 @@ bool X86InstrInfo::isReallyTriviallyReMaterializable(MachineInstr *MI) const { if (BaseReg == 0) return true; // Allow re-materialization of PIC load. + if (!ReMatPICStubLoad && MI->getOperand(4).isGlobal()) + return false; MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo(); bool isPICBase = false; for (MachineRegisterInfo::def_iterator I = MRI.def_begin(BaseReg),