RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-22 10:42:39 +01:00
Code Issues Projects Releases Wiki Activity

[GVN] Rearrange code to make local vs non-local cases more obvious [NFCI]

Browse Source 
llvm-svn: 258747
This commit is contained in:
Philip Reames 2016-01-25 23:37:53 +00:00
parent 258db6665b
commit 75dc59c9a3
1 changed files with 18 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
lib/Transforms/Scalar/GVN.cpp
View File

@ -1895,6 +1895,23 @@ bool GVN::processLoad(LoadInst *L) {
MemDepResult Dep = MD->getDependency(L);
const DataLayout &DL = L->getModule()->getDataLayout();
// If it is defined in another block, try harder.
if (Dep.isNonLocal())
return processNonLocalLoad(L);
// Only handle the local case below
if (!Dep.isDef() && !Dep.isClobber()) {
// This might be a NonFuncLocal or an Unknown
DEBUG(
// fast print dep, using operator<< on instruction is too slow.
dbgs() << "GVN: load ";
L->printAsOperand(dbgs());
dbgs() << " has unknown dependence\n";
);
return false;
}
// If we have a clobber and target data is around, see if this is a clobber
// that we can fix up through code synthesis.
if (Dep.isClobber()) {
@ -1966,19 +1983,7 @@ bool GVN::processLoad(LoadInst *L) {
return false;
}
// If it is defined in another block, try harder.
if (Dep.isNonLocal())
return processNonLocalLoad(L);
if (!Dep.isDef()) {
DEBUG(
// fast print dep, using operator<< on instruction is too slow.
dbgs() << "GVN: load ";
L->printAsOperand(dbgs());
dbgs() << " has unknown dependence\n";
);
return false;
}
assert(Dep.isDef() && "expected from control flow");
Instruction *DepInst = Dep.getInst();
Value *AvailableValue = nullptr;