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Take advantage of the fact that we are allowed to clobber the input module

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by splicing function bodies from the src module to the destination module.

This speeds up linking quite a bit, e.g. gccld time on 176.gcc from 26s -> 20s
when forming the .rbc file, with a profile build.  One of the really strange
but cool effects of this patch is that it speeds up the optimizers as well,
from 12s -> 10.7s, presumably because of better locality???

In any case, this is just a first step.  We can trivially get rid of the
LocalMap now and do other simplifications.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17893 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-11-16 07:31:51 +00:00
parent 30e4056a5d
commit 4bbfbff119
1 changed files with 8 additions and 26 deletions
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34
lib/Linker/LinkModules.cpp
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@ -676,7 +676,7 @@ static bool LinkFunctionProtos(Module *Dest, const Module *Src,
// fix up references to values. At this point we know that Dest is an external
// function, and that Src is not.
//
static bool LinkFunctionBody(Function *Dest, const Function *Src,
static bool LinkFunctionBody(Function *Dest, Function *Src,
std::map<const Value*, Value*> &GlobalMap,
std::string *Err) {
assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
@ -684,7 +684,7 @@ static bool LinkFunctionBody(Function *Dest, const Function *Src,
// Go through and convert function arguments over...
Function::aiterator DI = Dest->abegin();
for (Function::const_aiterator I = Src->abegin(), E = Src->aend();
for (Function::aiterator I = Src->abegin(), E = Src->aend();
I != E; ++I, ++DI) {
DI->setName(I->getName()); // Copy the name information over...
@ -692,27 +692,8 @@ static bool LinkFunctionBody(Function *Dest, const Function *Src,
LocalMap.insert(std::make_pair(I, DI));
}
// Loop over all of the basic blocks, copying the instructions over...
//
for (Function::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
// Create new basic block and add to mapping and the Dest function...
BasicBlock *DBB = new BasicBlock(I->getName(), Dest);
LocalMap.insert(std::make_pair(I, DBB));
// Loop over all of the instructions in the src basic block, copying them
// over. Note that this is broken in a strict sense because the cloned
// instructions will still be referencing values in the Src module, not
// the remapped values. In our case, however, we will not get caught and
// so we can delay patching the values up until later...
//
for (BasicBlock::const_iterator II = I->begin(), IE = I->end();
II != IE; ++II) {
Instruction *DI = II->clone();
DI->setName(II->getName());
DBB->getInstList().push_back(DI);
LocalMap.insert(std::make_pair(II, DI));
}
}
// Splice the body of the source function into the dest function.
Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList());
// At this point, all of the instructions and values of the function are now
// copied over. The only problem is that they are still referencing values in
@ -723,7 +704,8 @@ static bool LinkFunctionBody(Function *Dest, const Function *Src,
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end();
OI != OE; ++OI)
*OI = RemapOperand(*OI, LocalMap, &GlobalMap);
if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI))
*OI = RemapOperand(*OI, LocalMap, &GlobalMap);
return false;
}
@ -733,14 +715,14 @@ static bool LinkFunctionBody(Function *Dest, const Function *Src,
// source module into the DestModule. This consists basically of copying the
// function over and fixing up references to values.
//
static bool LinkFunctionBodies(Module *Dest, const Module *Src,
static bool LinkFunctionBodies(Module *Dest, Module *Src,
std::map<const Value*, Value*> &ValueMap,
std::string *Err) {
// Loop over all of the functions in the src module, mapping them over as we
// go
//
for (Module::const_iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF){
for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) {
if (!SF->isExternal()) { // No body if function is external
Function *DF = cast<Function>(ValueMap[SF]); // Destination function