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R600: Do not mergevector after a vector reg is used

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If we merge vector when a vector is used, it will generate an artificial
antidependency that can prevent 2 tex/vtx instructions to use the same
clause and thus generate extra clauses that reduce performance.

There is no test case as such situation is really hard to predict.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187516 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vincent Lejeune 2013-07-31 19:32:12 +00:00
parent 8e37705a73
commit 26db9ecfac
1 changed files with 10 additions and 1 deletions
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11
lib/Target/R600/R600OptimizeVectorRegisters.cpp
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@ -322,8 +322,17 @@ bool R600VectorRegMerger::runOnMachineFunction(MachineFunction &Fn) {
for (MachineBasicBlock::iterator MII = MB->begin(), MIIE = MB->end();
MII != MIIE; ++MII) {
MachineInstr *MI = MII;
if (MI->getOpcode() != AMDGPU::REG_SEQUENCE)
if (MI->getOpcode() != AMDGPU::REG_SEQUENCE) {
if (TII->get(MI->getOpcode()).TSFlags & R600_InstFlag::TEX_INST) {
unsigned Reg = MI->getOperand(1).getReg();
for (MachineRegisterInfo::def_iterator It = MRI->def_begin(Reg),
E = MRI->def_end(); It != E; ++It) {
RemoveMI(&(*It));
}
}
continue;
}
RegSeqInfo RSI(*MRI, MI);