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This patch substantially simplifies and cleans up handling of basic blocks

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in the bytecode parser.  Before we tried to shoehorn basic blocks into the
"getValue" code path with other types of values.  For a variety of reasons
this was a bad idea, so this patch separates it out into its own data structure.

This simplifies the code, makes it fit in 80 columns, and is also much faster.
In a testcase provided by Bill, which has lots of PHI nodes, this patch speeds
up bytecode parsing from taking 6.9s to taking 2.32s.  More speedups to
follow later.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8977 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-10-08 22:52:54 +00:00
parent 6e44802ec0
commit 4ee8ef2a5d
3 changed files with 84 additions and 60 deletions
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37
lib/Bytecode/Reader/InstructionReader.cpp
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@ -161,12 +161,11 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
delete PN;
return true;
case 2: PN->addIncoming(getValue(Raw->Ty, Raw->Arg1),
cast<BasicBlock>(getValue(Type::LabelTyID,
Raw->Arg2)));
getBasicBlock(Raw->Arg2));
break;
default:
PN->addIncoming(getValue(Raw->Ty, Raw->Arg1),
cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg2)));
PN->addIncoming(getValue(Raw->Ty, Raw->Arg1),
getBasicBlock(Raw->Arg2));
if (Raw->VarArgs->size() & 1) {
std::cerr << "PHI Node with ODD number of arguments!\n";
delete PN;
@ -174,8 +173,7 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
} else {
std::vector<unsigned> &args = *Raw->VarArgs;
for (unsigned i = 0; i < args.size(); i+=2)
PN->addIncoming(getValue(Raw->Ty, args[i]),
cast<BasicBlock>(getValue(Type::LabelTyID, args[i+1])));
PN->addIncoming(getValue(Raw->Ty, args[i]), getBasicBlock(args[i+1]));
}
delete Raw->VarArgs;
break;
@ -200,20 +198,18 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
case Instruction::Br:
if (Raw->NumOperands == 1) {
Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTyID,Raw->Arg1)));
Res = new BranchInst(getBasicBlock(Raw->Arg1));
return false;
} else if (Raw->NumOperands == 3) {
Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg1)),
cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg2)),
getValue(Type::BoolTyID , Raw->Arg3));
Res = new BranchInst(getBasicBlock(Raw->Arg1), getBasicBlock(Raw->Arg2),
getValue(Type::BoolTyID , Raw->Arg3));
return false;
}
break;
case Instruction::Switch: {
SwitchInst *I =
new SwitchInst(getValue(Raw->Ty, Raw->Arg1),
cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg2)));
new SwitchInst(getValue(Raw->Ty, Raw->Arg1), getBasicBlock(Raw->Arg2));
Res = I;
if (Raw->NumOperands < 3) return false; // No destinations? Weird.
@ -226,7 +222,7 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
std::vector<unsigned> &args = *Raw->VarArgs;
for (unsigned i = 0; i < args.size(); i += 2)
I->addCase(cast<Constant>(getValue(Raw->Ty, args[i])),
cast<BasicBlock>(getValue(Type::LabelTyID, args[i+1])));
getBasicBlock(args[i+1]));
delete Raw->VarArgs;
return false;
@ -311,11 +307,11 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
if (!FTy->isVarArg()) {
if (Raw->NumOperands < 3) return true;
Normal = cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg2));
Normal = getBasicBlock(Raw->Arg2);
if (Raw->NumOperands == 3)
Except = cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg3));
Except = getBasicBlock(Raw->Arg3);
else {
Except = cast<BasicBlock>(getValue(Type::LabelTyID, args[0]));
Except = getBasicBlock(args[0]);
FunctionType::ParamTypes::const_iterator It = PL.begin();
for (unsigned i = 1; i < args.size(); i++) {
@ -327,10 +323,11 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
}
} else {
if (args.size() < 4) return true;
if (getType(args[0]) != Type::LabelTy ||
getType(args[2]) != Type::LabelTy) return true;
Normal = cast<BasicBlock>(getValue(Type::LabelTyID, args[1]));
Except = cast<BasicBlock>(getValue(Type::LabelTyID, args[3]));
if (args[0] != Type::LabelTyID || args[2] != Type::LabelTyID)
return true;
Normal = getBasicBlock(args[1]);
Except = getBasicBlock(args[3]);
if ((args.size() & 1) != 0)
return true; // Must be pairs of type/value