6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-23 14:25:07 +00:00
Code Issues Projects Releases Wiki Activity

Auto-upgrade free instructions to calls to the builtin free function.

Browse Source 
Update all analysis passes and transforms to treat free calls just like FreeInst.
Remove RaiseAllocations and all its tests since FreeInst no longer needs to be raised.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84987 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Victor Hernandez
2009-10-24 04:23:03 +00:00
parent 5a850beb2e
commit 66284e063a
30 changed files with 169 additions and 269 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@@ -286,6 +286,7 @@ namespace {
Instruction *visitGetElementPtrInst(GetElementPtrInst &GEP);
Instruction *visitAllocaInst(AllocaInst &AI);
Instruction *visitFreeInst(FreeInst &FI);
Instruction *visitFree(Instruction &FI);
Instruction *visitLoadInst(LoadInst &LI);
Instruction *visitStoreInst(StoreInst &SI);
Instruction *visitBranchInst(BranchInst &BI);
@@ -9747,6 +9748,9 @@ Instruction *InstCombiner::SimplifyMemSet(MemSetInst *MI) {
/// the heavy lifting.
///
Instruction *InstCombiner::visitCallInst(CallInst &CI) {
if (isFreeCall(&CI))
return visitFree(CI);
// If the caller function is nounwind, mark the call as nounwind, even if the
// callee isn't.
if (CI.getParent()->getParent()->doesNotThrow() &&
@@ -11337,6 +11341,42 @@ Instruction *InstCombiner::visitFreeInst(FreeInst &FI) {
return 0;
}
Instruction *InstCombiner::visitFree(Instruction &FI) {
Value *Op = FI.getOperand(1);
// free undef -> unreachable.
if (isa<UndefValue>(Op)) {
// Insert a new store to null because we cannot modify the CFG here.
new StoreInst(ConstantInt::getTrue(*Context),
UndefValue::get(Type::getInt1PtrTy(*Context)), &FI);
return EraseInstFromFunction(FI);
}
// If we have 'free null' delete the instruction. This can happen in stl code
// when lots of inlining happens.
if (isa<ConstantPointerNull>(Op))
return EraseInstFromFunction(FI);
// FIXME: Bring back free (gep X, 0,0,0,0) into free(X) transform
if (isMalloc(Op)) {
if (CallInst* CI = extractMallocCallFromBitCast(Op)) {
if (Op->hasOneUse() && CI->hasOneUse()) {
EraseInstFromFunction(FI);
EraseInstFromFunction(*CI);
return EraseInstFromFunction(*cast<Instruction>(Op));
}
} else {
// Op is a call to malloc
if (Op->hasOneUse()) {
EraseInstFromFunction(FI);
return EraseInstFromFunction(*cast<Instruction>(Op));
}
}
}
return 0;
}
/// InstCombineLoadCast - Fold 'load (cast P)' -> cast (load P)' when possible.
static Instruction *InstCombineLoadCast(InstCombiner &IC, LoadInst &LI,