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Switch some getAliasSet clients to MCRegAliasIterator.

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MCRegAliasIterator can optionally visit the register itself, allowing
for simpler code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157837 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-06-01 20:36:54 +00:00
parent 73c2f7f5ed
commit f152fe8d48
8 changed files with 46 additions and 99 deletions
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40
lib/CodeGen/MachineCopyPropagation.cpp
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@ -62,26 +62,14 @@ void
MachineCopyPropagation::SourceNoLongerAvailable(unsigned Reg,
SourceMap &SrcMap,
DenseMap<unsigned, MachineInstr*> &AvailCopyMap) {
SourceMap::iterator SI = SrcMap.find(Reg);
if (SI != SrcMap.end()) {
const DestList& Defs = SI->second;
for (DestList::const_iterator I = Defs.begin(), E = Defs.end();
I != E; ++I) {
unsigned MappedDef = *I;
// Source of copy is no longer available for propagation.
if (AvailCopyMap.erase(MappedDef)) {
for (const uint16_t *SR = TRI->getSubRegisters(MappedDef); *SR; ++SR)
AvailCopyMap.erase(*SR);
}
}
}
for (const uint16_t *AS = TRI->getAliasSet(Reg); *AS; ++AS) {
SI = SrcMap.find(*AS);
for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) {
SourceMap::iterator SI = SrcMap.find(*AI);
if (SI != SrcMap.end()) {
const DestList& Defs = SI->second;
for (DestList::const_iterator I = Defs.begin(), E = Defs.end();
I != E; ++I) {
unsigned MappedDef = *I;
// Source of copy is no longer available for propagation.
if (AvailCopyMap.erase(MappedDef)) {
for (const uint16_t *SR = TRI->getSubRegisters(MappedDef); *SR; ++SR)
AvailCopyMap.erase(*SR);
@ -188,11 +176,8 @@ bool MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) {
}
// If Src is defined by a previous copy, it cannot be eliminated.
CI = CopyMap.find(Src);
if (CI != CopyMap.end())
MaybeDeadCopies.remove(CI->second);
for (const uint16_t *AS = TRI->getAliasSet(Src); *AS; ++AS) {
CI = CopyMap.find(*AS);
for (MCRegAliasIterator AI(Src, TRI, true); AI.isValid(); ++AI) {
CI = CopyMap.find(*AI);
if (CI != CopyMap.end())
MaybeDeadCopies.remove(CI->second);
}
@ -256,11 +241,8 @@ bool MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) {
// If 'Reg' is defined by a copy, the copy is no longer a candidate
// for elimination.
DenseMap<unsigned, MachineInstr*>::iterator CI = CopyMap.find(Reg);
if (CI != CopyMap.end())
MaybeDeadCopies.remove(CI->second);
for (const uint16_t *AS = TRI->getAliasSet(Reg); *AS; ++AS) {
CI = CopyMap.find(*AS);
for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) {
DenseMap<unsigned, MachineInstr*>::iterator CI = CopyMap.find(*AI);
if (CI != CopyMap.end())
MaybeDeadCopies.remove(CI->second);
}
@ -296,11 +278,9 @@ bool MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) {
unsigned Reg = Defs[i];
// No longer defined by a copy.
CopyMap.erase(Reg);
AvailCopyMap.erase(Reg);
for (const uint16_t *AS = TRI->getAliasSet(Reg); *AS; ++AS) {
CopyMap.erase(*AS);
AvailCopyMap.erase(*AS);
for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI) {
CopyMap.erase(*AI);
AvailCopyMap.erase(*AI);
}
// If 'Reg' is previously source of a copy, it is no longer available for