This is an archive of the discontinued LLVM Phabricator instance.

AMDGPU: Also look for s_cbranch_vccz
ClosedPublic

Authored by arsenm on May 18 2016, 4:15 PM.

Reviewers

• tstellarAMD
nhaehnle

arsenm retitled this revision from to AMDGPU: Also look for s_cbranch_vccz.

arsenm updated this object.

arsenm added a subscriber: llvm-commits.

LGTM.

This revision is now accepted and ready to land.May 19 2016, 8:57 AM

r270091

Path

Size

lib/

Target/

AMDGPU/

3 lines

Show First 20 Lines • Show All 152 Lines • ▼ Show 20 Lines	for (MachineFunction::iterator MBBI(From), ToI(To), End = MF->end();
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();		for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
NumInstr < SkipThreshold && I != E; ++I) {		NumInstr < SkipThreshold && I != E; ++I) {
if (opcodeEmitsNoInsts(I->getOpcode()))		if (opcodeEmitsNoInsts(I->getOpcode()))
continue;		continue;

// When a uniform loop is inside non-uniform control flow, the branch		// When a uniform loop is inside non-uniform control flow, the branch
// leaving the loop might be an S_CBRANCH_VCCNZ, which is never taken		// leaving the loop might be an S_CBRANCH_VCCNZ, which is never taken
// when EXEC = 0. We should skip the loop lest it becomes infinite.		// when EXEC = 0. We should skip the loop lest it becomes infinite.
if (I->getOpcode() == AMDGPU::S_CBRANCH_VCCNZ)		if (I->getOpcode() == AMDGPU::S_CBRANCH_VCCNZ \|\|
		I->getOpcode() == AMDGPU::S_CBRANCH_VCCZ)
return true;		return true;

if (++NumInstr >= SkipThreshold)		if (++NumInstr >= SkipThreshold)
return true;		return true;
}		}
}		}

return false;		return false;
▲ Show 20 Lines • Show All 469 Lines • Show Last 20 Lines