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Do not let debug info prevert globalopt from shriking a global vars to boolean.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66224 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2009-03-06 00:21:00 +00:00
parent c79e118247
commit f70bda2f81
2 changed files with 74 additions and 7 deletions
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16
lib/Transforms/IPO/GlobalOpt.cpp
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@ -23,6 +23,7 @@
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/Compiler.h"
@ -1562,7 +1563,7 @@ static bool TryToShrinkGlobalToBoolean(GlobalVariable *GV, Constant *OtherVal) {
// Walk the use list of the global seeing if all the uses are load or store.
// If there is anything else, bail out.
for (Value::use_iterator I = GV->use_begin(), E = GV->use_end(); I != E; ++I)
if (!isa<LoadInst>(I) && !isa<StoreInst>(I))
if (!isa<LoadInst>(I) && !isa<StoreInst>(I) && !UserIsDebugInfo(*I))
return false;
DOUT << " *** SHRINKING TO BOOL: " << *GV;
@ -1585,8 +1586,8 @@ static bool TryToShrinkGlobalToBoolean(GlobalVariable *GV, Constant *OtherVal) {
IsOneZero = InitVal->isNullValue() && CI->isOne();
while (!GV->use_empty()) {
Instruction *UI = cast<Instruction>(GV->use_back());
if (StoreInst *SI = dyn_cast<StoreInst>(UI)) {
User *GVU = GV->use_back();
if (StoreInst *SI = dyn_cast<StoreInst>(GVU)) {
// Change the store into a boolean store.
bool StoringOther = SI->getOperand(0) == OtherVal;
// Only do this if we weren't storing a loaded value.
@ -1614,9 +1615,9 @@ static bool TryToShrinkGlobalToBoolean(GlobalVariable *GV, Constant *OtherVal) {
}
}
new StoreInst(StoreVal, NewGV, SI);
} else {
SI->eraseFromParent();
} else if (LoadInst *LI = dyn_cast<LoadInst>(GVU)) {
// Change the load into a load of bool then a select.
LoadInst *LI = cast<LoadInst>(UI);
LoadInst *NLI = new LoadInst(NewGV, LI->getName()+".b", LI);
Value *NSI;
if (IsOneZero)
@ -1625,8 +1626,9 @@ static bool TryToShrinkGlobalToBoolean(GlobalVariable *GV, Constant *OtherVal) {
NSI = SelectInst::Create(NLI, OtherVal, InitVal, "", LI);
NSI->takeName(LI);
LI->replaceAllUsesWith(NSI);
}
UI->eraseFromParent();
LI->eraseFromParent();
} else
RemoveDbgInfoUser(GVU);
}
GV->eraseFromParent();