RPCS3/llvm
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm.git synced 2025-01-15 06:18:50 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Handle register masks when searching for EFLAGS clobbers.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150117 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-02-09 00:17:22 +00:00
parent 39284d191a
commit 450b3850ce
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
lib/Target/X86/X86InstrInfo.cpp
View File

@ -1419,6 +1419,8 @@ static bool isSafeToClobberEFLAGS(MachineBasicBlock &MBB,
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 @@ static bool isSafeToClobberEFLAGS(MachineBasicBlock &MBB,
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;