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Remove dyn_cast + dereference pattern by replacing it with a cast and changing

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the safety check to look for the same type we're going to actually cast to.
Fixes PR13180!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159110 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2012-06-24 10:15:42 +00:00
parent e7f702fc2d
commit edb5842b7c
2 changed files with 21 additions and 3 deletions
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4
lib/Transforms/Utils/SimplifyCFG.cpp
View File

@ -156,7 +156,7 @@ static bool isProfitableToFoldUnconditional(BranchInst *SI1,
isa<PHINode>(BBI); ++BBI) { isa<PHINode>(BBI); ++BBI) {
PHINode *PN = cast<PHINode>(BBI); PHINode *PN = cast<PHINode>(BBI);
if (PN->getIncomingValueForBlock(SI1BB) != Cond || if (PN->getIncomingValueForBlock(SI1BB) != Cond ||
!isa<Constant>(PN->getIncomingValueForBlock(SI2BB))) !isa<ConstantInt>(PN->getIncomingValueForBlock(SI2BB)))
return false; return false;
PhiNodes.push_back(PN); PhiNodes.push_back(PN);
} }
@ -1782,7 +1782,7 @@ bool llvm::FoldBranchToCommonDest(BranchInst *BI) {
} else { } else {
// Update PHI nodes in the common successors. // Update PHI nodes in the common successors.
for (unsigned i = 0, e = PHIs.size(); i != e; ++i) { for (unsigned i = 0, e = PHIs.size(); i != e; ++i) {
ConstantInt *PBI_C = dyn_cast<ConstantInt>( ConstantInt *PBI_C = cast<ConstantInt>(
PHIs[i]->getIncomingValueForBlock(PBI->getParent())); PHIs[i]->getIncomingValueForBlock(PBI->getParent()));
assert(PBI_C->getType()->isIntegerTy(1)); assert(PBI_C->getType()->isIntegerTy(1));
Instruction *MergedCond = 0; Instruction *MergedCond = 0;

18
test/Transforms/SimplifyCFG/branch-fold.ll
View File

@ -50,3 +50,21 @@ c:
%o2 = phi i1 [ false, %a ], [ %phitmp, %b ], [ false, %entry ] %o2 = phi i1 [ false, %a ], [ %phitmp, %b ], [ false, %entry ]
ret i1 %o2 ret i1 %o2
} }
; PR13180
define void @pr13180(i8 %p) {
entry:
%tobool = icmp eq i8 %p, 0
br i1 %tobool, label %cond.false, label %cond.true
cond.true: ; preds = %entry
br label %cond.end
cond.false: ; preds = %entry
%phitmp = icmp eq i8 %p, 0
br label %cond.end
cond.end: ; preds = %cond.false, %cond.true
%cond = phi i1 [ undef, %cond.true ], [ %phitmp, %cond.false ]
unreachable
}