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Add target hook for pseudo instruction expansion.

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Many targets use pseudo instructions to help register allocation.  Like
the COPY instruction, these pseudos can be expanded after register
allocation.  The early expansion can make life easier for PEI and the
post-ra scheduler.

This patch adds a hook that is called for all remaining pseudo
instructions from the ExpandPostRAPseudos pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140472 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-09-25 19:21:35 +00:00
parent 0eba4fe292
commit c291e2f578
4 changed files with 35 additions and 7 deletions
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23
lib/CodeGen/ExpandPostRAPseudos.cpp
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@@ -202,17 +202,26 @@ bool ExpandPostRA::runOnMachineFunction(MachineFunction &MF) {
mbbi != mbbe; ++mbbi) {
for (MachineBasicBlock::iterator mi = mbbi->begin(), me = mbbi->end();
mi != me;) {
MachineBasicBlock::iterator nmi = llvm::next(mi);
MachineInstr *MI = mi;
assert(!MI->isInsertSubreg() && "INSERT_SUBREG should no longer appear");
assert(MI->getOpcode() != TargetOpcode::EXTRACT_SUBREG &&
"EXTRACT_SUBREG should no longer appear");
if (MI->isSubregToReg()) {
// Advance iterator here because MI may be erased.
++mi;
switch (MI->getOpcode()) {
case TargetOpcode::SUBREG_TO_REG:
MadeChange |= LowerSubregToReg(MI);
} else if (MI->isCopy()) {
break;
case TargetOpcode::COPY:
MadeChange |= LowerCopy(MI);
break;
case TargetOpcode::DBG_VALUE:
continue;
case TargetOpcode::INSERT_SUBREG:
case TargetOpcode::EXTRACT_SUBREG:
llvm_unreachable("Sub-register pseudos should have been eliminated.");
default:
if (MI->getDesc().isPseudo())
MadeChange |= TII->expandPostRAPseudo(MI);
break;
}
mi = nmi;
}
}