[llvm-commits] [llvm] r68730 - in /llvm/trunk: include/llvm/Target/TargetRegisterInfo.h lib/Target/TargetRegisterInfo.cpp utils/TableGen/RegisterInfoEmitter.cpp
Owen Anderson
resistor at mac.com
Thu Apr 9 15:19:30 PDT 2009
Author: resistor
Date: Thu Apr 9 17:19:30 2009
New Revision: 68730
URL: http://llvm.org/viewvc/llvm-project?rev=68730&view=rev
Log:
Give register alias checking the hash table treatment too.
Modified:
llvm/trunk/include/llvm/Target/TargetRegisterInfo.h
llvm/trunk/lib/Target/TargetRegisterInfo.cpp
llvm/trunk/utils/TableGen/RegisterInfoEmitter.cpp
Modified: llvm/trunk/include/llvm/Target/TargetRegisterInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetRegisterInfo.h?rev=68730&r1=68729&r2=68730&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Target/TargetRegisterInfo.h (original)
+++ llvm/trunk/include/llvm/Target/TargetRegisterInfo.h Thu Apr 9 17:19:30 2009
@@ -226,6 +226,8 @@
const unsigned SubregHashSize;
const unsigned* SuperregHash;
const unsigned SuperregHashSize;
+ const unsigned* AliasesHash;
+ const unsigned AliasesHashSize;
public:
typedef const TargetRegisterClass * const * regclass_iterator;
private:
@@ -244,7 +246,9 @@
const unsigned* subregs = 0,
const unsigned subregsize = 0,
const unsigned* superregs = 0,
- const unsigned superregsize = 0);
+ const unsigned superregsize = 0,
+ const unsigned* aliases = 0,
+ const unsigned aliasessize = 0);
virtual ~TargetRegisterInfo();
public:
@@ -346,8 +350,17 @@
/// areAliases - Returns true if the two registers alias each other, false
/// otherwise
bool areAliases(unsigned regA, unsigned regB) const {
- for (const unsigned *Alias = getAliasSet(regA); *Alias; ++Alias)
- if (*Alias == regB) return true;
+ size_t index = (regA + regB * 37) & (AliasesHashSize-1);
+ unsigned ProbeAmt = 0;
+ while (AliasesHash[index*2] != 0 &&
+ AliasesHash[index*2+1] != 0) {
+ if (AliasesHash[index*2] == regA && AliasesHash[index*2+1] == regB)
+ return true;
+
+ index = (index + ProbeAmt) & (AliasesHashSize-1);
+ ProbeAmt += 2;
+ }
+
return false;
}
Modified: llvm/trunk/lib/Target/TargetRegisterInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/TargetRegisterInfo.cpp?rev=68730&r1=68729&r2=68730&view=diff
==============================================================================
--- llvm/trunk/lib/Target/TargetRegisterInfo.cpp (original)
+++ llvm/trunk/lib/Target/TargetRegisterInfo.cpp Thu Apr 9 17:19:30 2009
@@ -24,9 +24,11 @@
regclass_iterator RCB, regclass_iterator RCE,
int CFSO, int CFDO,
const unsigned* subregs, const unsigned subregsize,
- const unsigned* superregs, const unsigned superregsize)
+ const unsigned* superregs, const unsigned superregsize,
+ const unsigned* aliases, const unsigned aliasessize)
: SubregHash(subregs), SubregHashSize(subregsize),
SuperregHash(superregs), SuperregHashSize(superregsize),
+ AliasesHash(aliases), AliasesHashSize(aliasessize),
Desc(D), NumRegs(NR), RegClassBegin(RCB), RegClassEnd(RCE) {
assert(NumRegs < FirstVirtualRegister &&
"Target has too many physical registers!");
Modified: llvm/trunk/utils/TableGen/RegisterInfoEmitter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/RegisterInfoEmitter.cpp?rev=68730&r1=68729&r2=68730&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/RegisterInfoEmitter.cpp (original)
+++ llvm/trunk/utils/TableGen/RegisterInfoEmitter.cpp Thu Apr 9 17:19:30 2009
@@ -540,6 +540,82 @@
delete [] SuperregHashTable;
+
+ // Print the AliasHashTable, a simple quadratically probed
+ // hash table for determining if a register aliases another register.
+ unsigned NumAliases = 0;
+ RegNo.clear();
+ for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
+ RegNo[Regs[i].TheDef] = i;
+ NumAliases += RegisterAliases[Regs[i].TheDef].size();
+ }
+
+ unsigned AliasesHashTableSize = 2 * NextPowerOf2(2 * NumAliases);
+ unsigned* AliasesHashTable = new unsigned[2 * AliasesHashTableSize];
+ std::fill(AliasesHashTable, AliasesHashTable + 2 * AliasesHashTableSize, ~0U);
+
+ hashMisses = 0;
+
+ for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
+ Record* R = Regs[i].TheDef;
+ for (std::set<Record*>::iterator I = RegisterAliases[R].begin(),
+ E = RegisterAliases[R].end(); I != E; ++I) {
+ Record* RJ = *I;
+ // We have to increase the indices of both registers by one when
+ // computing the hash because, in the generated code, there
+ // will be an extra empty slot at register 0.
+ size_t index = ((i+1) + (RegNo[RJ]+1) * 37) & (AliasesHashTableSize-1);
+ unsigned ProbeAmt = 2;
+ while (AliasesHashTable[index*2] != ~0U &&
+ AliasesHashTable[index*2+1] != ~0U) {
+ index = (index + ProbeAmt) & (AliasesHashTableSize-1);
+ ProbeAmt += 2;
+
+ hashMisses++;
+ }
+
+ AliasesHashTable[index*2] = i;
+ AliasesHashTable[index*2+1] = RegNo[RJ];
+ }
+ }
+
+ OS << "\n\n // Number of hash collisions: " << hashMisses << "\n";
+
+ if (AliasesHashTableSize) {
+ std::string Namespace = Regs[0].TheDef->getValueAsString("Namespace");
+
+ OS << " const unsigned AliasesHashTable[] = { ";
+ for (unsigned i = 0; i < AliasesHashTableSize - 1; ++i) {
+ if (i != 0)
+ // Insert spaces for nice formatting.
+ OS << " ";
+
+ if (AliasesHashTable[2*i] != ~0U) {
+ OS << getQualifiedName(Regs[AliasesHashTable[2*i]].TheDef) << ", "
+ << getQualifiedName(Regs[AliasesHashTable[2*i+1]].TheDef) << ", \n";
+ } else {
+ OS << Namespace << "::NoRegister, " << Namespace << "::NoRegister, \n";
+ }
+ }
+
+ unsigned Idx = AliasesHashTableSize*2-2;
+ if (AliasesHashTable[Idx] != ~0U) {
+ OS << " "
+ << getQualifiedName(Regs[AliasesHashTable[Idx]].TheDef) << ", "
+ << getQualifiedName(Regs[AliasesHashTable[Idx+1]].TheDef) << " };\n";
+ } else {
+ OS << Namespace << "::NoRegister, " << Namespace << "::NoRegister };\n";
+ }
+
+ OS << " const unsigned AliasesHashTableSize = "
+ << AliasesHashTableSize << ";\n";
+ } else {
+ OS << " const unsigned AliasesHashTable[] = { ~0U, ~0U };\n"
+ << " const unsigned AliasesHashTableSize = 1;\n";
+ }
+
+ delete [] AliasesHashTable;
+
if (!RegisterAliases.empty())
OS << "\n\n // Register Alias Sets...\n";
@@ -677,7 +753,8 @@
<< ", RegisterClasses, RegisterClasses+" << RegisterClasses.size() <<",\n "
<< " CallFrameSetupOpcode, CallFrameDestroyOpcode,\n"
<< " SubregHashTable, SubregHashTableSize,\n"
- << " SuperregHashTable, SuperregHashTableSize) {\n"
+ << " SuperregHashTable, SuperregHashTableSize,\n"
+ << " AliasesHashTable, AliasesHashTableSize) {\n"
<< "}\n\n";
// Collect all information about dwarf register numbers
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