RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 11:42:57 +01:00
Code Issues Projects Releases Wiki Activity

cache result of operator*

Browse Source 
llvm-svn: 108146
This commit is contained in:
Gabor Greif 2010-07-12 14:15:10 +00:00
parent bf2470e6e9
commit b2b6867582
1 changed files with 9 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
lib/Transforms/IPO/ArgumentPromotion.cpp
View File

@ -360,19 +360,20 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
IndicesVector Operands;
for (Value::use_iterator UI = Arg->use_begin(), E = Arg->use_end();
UI != E; ++UI) {
User *U = *UI;
Operands.clear();
if (LoadInst *LI = dyn_cast<LoadInst>(*UI)) {
if (LoadInst *LI = dyn_cast<LoadInst>(U)) {
if (LI->isVolatile()) return false; // Don't hack volatile loads
Loads.push_back(LI);
// Direct loads are equivalent to a GEP with a zero index and then a load.
Operands.push_back(0);
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(*UI)) {
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(U)) {
if (GEP->use_empty()) {
// Dead GEP's cause trouble later. Just remove them if we run into
// them.
getAnalysis<AliasAnalysis>().deleteValue(GEP);
GEP->eraseFromParent();
// TODO: This runs the above loop over and over again for dead GEPS
// TODO: This runs the above loop over and over again for dead GEPs
// Couldn't we just do increment the UI iterator earlier and erase the
// use?
return isSafeToPromoteArgument(Arg, isByVal);
@ -452,12 +453,14 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
// Now check every path from the entry block to the load for transparency.
// To do this, we perform a depth first search on the inverse CFG from the
// loading block.
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI) {
BasicBlock *P = *PI;
for (idf_ext_iterator<BasicBlock*, SmallPtrSet<BasicBlock*, 16> >
I = idf_ext_begin(*PI, TranspBlocks),
E = idf_ext_end(*PI, TranspBlocks); I != E; ++I)
I = idf_ext_begin(P, TranspBlocks),
E = idf_ext_end(P, TranspBlocks); I != E; ++I)
if (AA.canBasicBlockModify(**I, Arg, LoadSize))
return false;
}
}
// If the path from the entry of the function to each load is free of