6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-25 13:24:46 +00:00
Code Issues Projects Releases Wiki Activity

Revert 75571; I'm convinced this isn't the right thing to do.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75642 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2009-07-14 17:48:25 +00:00
parent c23197a26f
commit fa196e34b0
2 changed files with 8 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
lib/Transforms/Scalar/SimplifyCFGPass.cpp
View File

@@ -109,8 +109,6 @@ static bool MarkAliveBlocks(BasicBlock *BB,
if (!Reachable.insert(BB))
continue;
bool AsmFound = false;
StoreInst *UndefStore = 0;
// Do a quick scan of the basic block, turning any obviously unreachable
// instructions into LLVM unreachable insts. The instruction combining pass
// canonicalizes unreachable insts into stores to null or undef.
@@ -127,27 +125,20 @@ static bool MarkAliveBlocks(BasicBlock *BB,
}
break;
}
if (isa<InlineAsm>(CI->getOperand(0)))
AsmFound = true;
}
if (StoreInst *SI = dyn_cast<StoreInst>(BBI)) {
Value *Ptr = SI->getOperand(1);
if ((isa<UndefValue>(Ptr) ||
(isa<ConstantPointerNull>(Ptr) &&
cast<PointerType>(Ptr->getType())->getAddressSpace() == 0)) &&
!UndefStore)
UndefStore = SI;
if (isa<UndefValue>(Ptr) ||
(isa<ConstantPointerNull>(Ptr) &&
cast<PointerType>(Ptr->getType())->getAddressSpace() == 0)) {
ChangeToUnreachable(SI, Context);
Changed = true;
break;
}
}
}
// We can't delete asm's just because their inputs are undefined;
// xor R, R is a common idiom for zeroing a register, for example.
// Assume user knows what he is doing.
if (UndefStore && !AsmFound) {
ChangeToUnreachable(UndefStore, Context);
Changed = true;
}
// Turn invokes that call 'nounwind' functions into ordinary calls.
if (InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator()))