6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-03-04 21:31:03 +00:00
Code Issues Projects Releases Wiki Activity

Introduce TargetRegisterInfo::getOverlaps(Reg), returning a list of all

Browse Source 
registers that alias Reg, including itself. This is almost the same as the
existing getAliasSet() method, except for the inclusion of Reg.

The name matches the reflexive TRI::regsOverlap(x, y) relation.

It is very common to do stuff to a register and all its aliases:

  stuff(Reg)
  for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias)
    stuff(*Alias);

That can now be written as the simpler:

  for (const unsigned *Alias = TRI->getOverlaps(Reg); *Alias; ++Alias)
    stuff(*Alias);

This change requires a bit more constant space for the alias lists because Reg
is included and because the empty alias list cannot be shared any longer.

If the getAliasSet method is eventually removed, this space can be reclaimed by
sharing overlap lists. For instance, %rax and %eax have identical overlap sets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121800 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-12-14 23:03:42 +00:00
parent d40963c406
commit b83ff84193
2 changed files with 23 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
include/llvm/Target/TargetRegisterInfo.h
View File

@ -32,19 +32,18 @@ template<class T> class SmallVectorImpl;
class raw_ostream;
/// TargetRegisterDesc - This record contains all of the information known about
/// a particular register. The AliasSet field (if not null) contains a pointer
/// to a Zero terminated array of registers that this register aliases. This is
/// needed for architectures like X86 which have AL alias AX alias EAX.
/// Registers that this does not apply to simply should set this to null.
/// The SubRegs field is a zero terminated array of registers that are
/// sub-registers of the specific register, e.g. AL, AH are sub-registers of AX.
/// The SuperRegs field is a zero terminated array of registers that are
/// a particular register. The Overlaps field contains a pointer to a zero
/// terminated array of registers that this register aliases, starting with
/// itself. This is needed for architectures like X86 which have AL alias AX
/// alias EAX. The SubRegs field is a zero terminated array of registers that
/// are sub-registers of the specific register, e.g. AL, AH are sub-registers of
/// AX. The SuperRegs field is a zero terminated array of registers that are
/// super-registers of the specific register, e.g. RAX, EAX, are super-registers
/// of AX.
///
struct TargetRegisterDesc {
const char *Name; // Printable name for the reg (for debugging)
const unsigned *AliasSet; // Register Alias Set, described above
const unsigned *Overlaps; // Overlapping registers, described above
const unsigned *SubRegs; // Sub-register set, described above
const unsigned *SuperRegs; // Super-register set, described above
};
@ -355,7 +354,17 @@ public:
/// terminated.
///
const unsigned *getAliasSet(unsigned RegNo) const {
return get(RegNo).AliasSet;
// The Overlaps set always begins with Reg itself.
return get(RegNo).Overlaps + 1;
}
/// getOverlaps - Return a list of registers that overlap Reg, including
/// itself. This is the same as the alias set except Reg is included in the
/// list.
/// These are exactly the registers in { x | regsOverlap(x, Reg) }.
///
const unsigned *getOverlaps(unsigned RegNo) const {
return get(RegNo).Overlaps;
}
/// getSubRegisters - Return the list of registers that are sub-registers of

18
utils/TableGen/RegisterInfoEmitter.cpp
View File

@ -777,17 +777,13 @@ void RegisterInfoEmitter::run(raw_ostream &OS) {
delete [] AliasesHashTable;
if (!RegisterAliases.empty())
OS << "\n\n // Register Alias Sets...\n";
OS << "\n\n // Register Overlap Lists...\n";
// Emit the empty alias list
OS << " const unsigned Empty_AliasSet[] = { 0 };\n";
// Loop over all of the registers which have aliases, emitting the alias list
// to memory.
// Emit an overlap list for all registers.
for (std::map<Record*, std::set<Record*>, LessRecord >::iterator
I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) {
if (I->second.empty())
continue;
OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { ";
OS << " const unsigned " << I->first->getName() << "_Overlaps[] = { "
<< getQualifiedName(I->first) << ", ";
for (std::set<Record*>::iterator ASI = I->second.begin(),
E = I->second.end(); ASI != E; ++ASI)
OS << getQualifiedName(*ASI) << ", ";
@ -849,11 +845,7 @@ void RegisterInfoEmitter::run(raw_ostream &OS) {
for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
const CodeGenRegister &Reg = Regs[i];
OS << " { \"";
OS << Reg.getName() << "\",\t";
if (!RegisterAliases[Reg.TheDef].empty())
OS << Reg.getName() << "_AliasSet,\t";
else
OS << "Empty_AliasSet,\t";
OS << Reg.getName() << "\",\t" << Reg.getName() << "_Overlaps,\t";
if (!RegisterSubRegs[Reg.TheDef].empty())
OS << Reg.getName() << "_SubRegsSet,\t";
else