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LoopSimplify shouldn't split loop backedges that use indirectbr. PR7867.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111061 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-08-14 00:43:09 +00:00
parent e2c6d131d1
commit c2f40066bb
2 changed files with 40 additions and 0 deletions
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5
lib/Transforms/Utils/LoopSimplify.cpp
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@ -622,6 +622,11 @@ LoopSimplify::InsertUniqueBackedgeBlock(Loop *L, BasicBlock *Preheader) {
std::vector<BasicBlock*> BackedgeBlocks;
for (pred_iterator I = pred_begin(Header), E = pred_end(Header); I != E; ++I){
BasicBlock *P = *I;
// Indirectbr edges cannot be split, so we must fail if we find one.
if (isa<IndirectBrInst>(P->getTerminator()))
return 0;
if (P != Preheader) BackedgeBlocks.push_back(P);
}

35
test/Transforms/LoopSimplify/indirectbr-backedge.ll Normal file
View File

@ -0,0 +1,35 @@
; RUN: opt -loopsimplify -S < %s | FileCheck %s
; LoopSimplify shouldn't split loop backedges that use indirectbr.
; CHECK: bb1: ; preds = %bb5, %bb
; CHECK-NEXT: indirectbr
; CHECK: bb5: ; preds = %bb1
; CHECK-NEXT: br label %bb1{{$}}
define void @foo(i8* %p) nounwind {
bb:
br label %bb1
bb1: ; preds = %bb5, %bb1, %bb
indirectbr i8* %p, [label %bb6, label %bb7, label %bb1, label %bb2, label %bb3, label %bb5, label %bb4]
bb2: ; preds = %bb1
ret void
bb3: ; preds = %bb1
ret void
bb4: ; preds = %bb1
ret void
bb5: ; preds = %bb1
br label %bb1
bb6: ; preds = %bb1
ret void
bb7: ; preds = %bb1
ret void
}