diff options
Diffstat (limited to 'contrib/llvm/lib/CodeGen/MachineCopyPropagation.cpp')
| -rw-r--r-- | contrib/llvm/lib/CodeGen/MachineCopyPropagation.cpp | 16 |
1 files changed, 4 insertions, 12 deletions
diff --git a/contrib/llvm/lib/CodeGen/MachineCopyPropagation.cpp b/contrib/llvm/lib/CodeGen/MachineCopyPropagation.cpp index 5de6dec29fb9..f83b5481e0a5 100644 --- a/contrib/llvm/lib/CodeGen/MachineCopyPropagation.cpp +++ b/contrib/llvm/lib/CodeGen/MachineCopyPropagation.cpp @@ -27,7 +27,7 @@ #include "llvm/Target/TargetSubtargetInfo.h" using namespace llvm; -#define DEBUG_TYPE "codegen-cp" +#define DEBUG_TYPE "machine-cp" STATISTIC(NumDeletes, "Number of dead copies deleted"); @@ -79,7 +79,7 @@ namespace { char MachineCopyPropagation::ID = 0; char &llvm::MachineCopyPropagationID = MachineCopyPropagation::ID; -INITIALIZE_PASS(MachineCopyPropagation, "machine-cp", +INITIALIZE_PASS(MachineCopyPropagation, DEBUG_TYPE, "Machine Copy Propagation Pass", false, false) /// Remove any entry in \p Map where the register is a subregister or equal to @@ -291,17 +291,9 @@ void MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) { if (MO.isDef()) { Defs.push_back(Reg); - } else { + continue; + } else if (MO.readsReg()) ReadRegister(Reg); - } - // Treat undef use like defs for copy propagation but not for - // dead copy. We would need to do a liveness check to be sure the copy - // is dead for undef uses. - // The backends are allowed to do whatever they want with undef value - // and we cannot be sure this register will not be rewritten to break - // some false dependencies for the hardware for instance. - if (MO.isUndef()) - Defs.push_back(Reg); } // The instruction has a register mask operand which means that it clobbers |