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[Unroll] Handle SwitchInst properly.

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Previously successor selection was simply wrong.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243545 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Zolotukhin 2015-07-29 18:10:33 +00:00
parent 815580fe7a
commit 607fe5bb28
2 changed files with 26 additions and 2 deletions
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4
lib/Transforms/Scalar/LoopUnrollPass.cpp
View File

@ -619,8 +619,8 @@ analyzeLoopUnrollCost(const Loop *L, unsigned TripCount, ScalarEvolution &SE,
if (isa<UndefValue>(SimpleCond)) if (isa<UndefValue>(SimpleCond))
Succ = SI->getSuccessor(0); Succ = SI->getSuccessor(0);
else else
Succ = Succ = SI->findCaseValue(cast<ConstantInt>(SimpleCond))
SI->getSuccessor(cast<ConstantInt>(SimpleCond)->getSExtValue()); .getCaseSuccessor();
if (L->contains(Succ)) if (L->contains(Succ))
BBWorklist.insert(Succ); BBWorklist.insert(Succ);
continue; continue;

24
test/Transforms/LoopUnroll/full-unroll-crashers.ll
View File

@ -57,3 +57,27 @@ for.inc: ; preds = %for.body, %if.then
for.end: ; preds = %for.inc for.end: ; preds = %for.inc
ret void ret void
} }
define void @switch() {
entry:
br label %for.body
for.body:
%iv.0 = phi i64 [ 0, %entry ], [ %iv.1, %for.inc ]
%arrayidx1 = getelementptr inbounds [10 x i32], [10 x i32]* @known_constant, i64 0, i64 %iv.0
%x1 = load i32, i32* %arrayidx1, align 4
switch i32 %x1, label %l1 [
]
l1:
%x2 = add i32 %x1, 2
br label %for.inc
for.inc:
%iv.1 = add nuw nsw i64 %iv.0, 1
%exitcond = icmp eq i64 %iv.1, 10
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}