[llvm-commits] [llvm] r150117 - /llvm/trunk/lib/Target/X86/X86InstrInfo.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Wed Feb  8 18:17:22 2012
New Revision: 150117

URL: http://llvm.org/viewvc/llvm-project?rev=150117&view=rev
Log:
Handle register masks when searching for EFLAGS clobbers.

Calls clobber the flags, but when using register masks there is no
EFLAGS<imp-def> operand.

Modified:
    llvm/trunk/lib/Target/X86/X86InstrInfo.cpp

Modified: llvm/trunk/lib/Target/X86/X86InstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrInfo.cpp?rev=150117&r1=150116&r2=150117&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86InstrInfo.cpp Wed Feb  8 18:17:22 2012
@@ -1419,6 +1419,8 @@
     bool SeenDef = false;
     for (unsigned j = 0, e = Iter->getNumOperands(); j != e; ++j) {
       MachineOperand &MO = Iter->getOperand(j);
+      if (MO.isRegMask() && MO.clobbersPhysReg(X86::EFLAGS))
+        SeenDef = true;
       if (!MO.isReg())
         continue;
       if (MO.getReg() == X86::EFLAGS) {
@@ -1463,6 +1465,10 @@
     bool SawKill = false;
     for (unsigned j = 0, e = Iter->getNumOperands(); j != e; ++j) {
       MachineOperand &MO = Iter->getOperand(j);
+      // A register mask may clobber EFLAGS, but we should still look for a
+      // live EFLAGS def.
+      if (MO.isRegMask() && MO.clobbersPhysReg(X86::EFLAGS))
+        SawKill = true;
       if (MO.isReg() && MO.getReg() == X86::EFLAGS) {
         if (MO.isDef()) return MO.isDead();
         if (MO.isKill()) SawKill = true;