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Optimized usage of new SwitchInst case values (IntegersSubset type) in Local.cpp, Execution.cpp and BitcodeWriter.cpp.

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I got about 1% of compile-time improvement on my machines (Ubuntu 11.10 i386 and Ubuntu 12.04 x64).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159076 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stepan Dyatkovskiy
2012-06-23 10:58:58 +00:00
parent fc76b8691e
commit 47cbc4e0ee
4 changed files with 64 additions and 27 deletions
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43
lib/Bitcode/Writer/BitcodeWriter.cpp
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@ -1157,19 +1157,38 @@ static void WriteInstruction(const Instruction &I, unsigned InstID,
Vals64.push_back(SI.getNumCases());
for (SwitchInst::CaseIt i = SI.case_begin(), e = SI.case_end();
i != e; ++i) {
IntegersSubset CaseRanges = i.getCaseValueEx();
Vals64.push_back(CaseRanges.getNumItems());
for (unsigned ri = 0, rn = CaseRanges.getNumItems(); ri != rn; ++ri) {
IntegersSubset::Range r = CaseRanges.getItem(ri);
bool IsSingleNumber = r.isSingleNumber();
Vals64.push_back(IsSingleNumber);
unsigned Code, Abbrev; // will unused.
IntegersSubset& CaseRanges = i.getCaseValueEx();
unsigned Code, Abbrev; // will unused.
if (CaseRanges.isSingleNumber()) {
Vals64.push_back(1/*NumItems = 1*/);
Vals64.push_back(true/*IsSingleNumber = true*/);
EmitAPInt(Vals64, Code, Abbrev, CaseRanges.getSingleNumber(0), true);
} else {
EmitAPInt(Vals64, Code, Abbrev, r.getLow(), true);
if (!IsSingleNumber)
EmitAPInt(Vals64, Code, Abbrev, r.getHigh(), true);
Vals64.push_back(CaseRanges.getNumItems());
if (CaseRanges.isSingleNumbersOnly()) {
for (unsigned ri = 0, rn = CaseRanges.getNumItems();
ri != rn; ++ri) {
Vals64.push_back(true/*IsSingleNumber = true*/);
EmitAPInt(Vals64, Code, Abbrev,
CaseRanges.getSingleNumber(ri), true);
}
} else
for (unsigned ri = 0, rn = CaseRanges.getNumItems();
ri != rn; ++ri) {
IntegersSubset::Range r = CaseRanges.getItem(ri);
bool IsSingleNumber = CaseRanges.isSingleNumber(ri);
Vals64.push_back(IsSingleNumber);
EmitAPInt(Vals64, Code, Abbrev, r.getLow(), true);
if (!IsSingleNumber)
EmitAPInt(Vals64, Code, Abbrev, r.getHigh(), true);
}
}
Vals64.push_back(VE.getValueID(i.getCaseSuccessor()));
}