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Split the landing pad basic block with the correct function. Also merge the

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split landingpad instructions into a PHI node.
PR11016


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140592 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-09-27 00:59:31 +00:00
parent 80ef1b287f
commit d5520987d1
2 changed files with 90 additions and 3 deletions
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26
lib/Transforms/Scalar/LoopUnswitch.cpp
View File

@ -561,10 +561,17 @@ void LoopUnswitch::SplitExitEdges(Loop *L,
BasicBlock *ExitBlock = ExitBlocks[i];
SmallVector<BasicBlock *, 4> Preds(pred_begin(ExitBlock),
pred_end(ExitBlock));
// Although SplitBlockPredecessors doesn't preserve loop-simplify in
// general, if we call it on all predecessors of all exits then it does.
SplitBlockPredecessors(ExitBlock, Preds.data(), Preds.size(),
".us-lcssa", this);
if (!ExitBlock->isLandingPad()) {
SplitBlockPredecessors(ExitBlock, Preds.data(), Preds.size(),
".us-lcssa", this);
} else {
SmallVector<BasicBlock*, 2> NewBBs;
SplitLandingPadPredecessors(ExitBlock, Preds, ".us-lcssa", ".us-lcssa",
this, NewBBs);
}
}
}
@ -632,7 +639,7 @@ void LoopUnswitch::UnswitchNontrivialCondition(Value *LIC, Constant *Val,
// as well.
ParentLoop->addBasicBlockToLoop(NewBlocks[0], LI->getBase());
}
for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i) {
BasicBlock *NewExit = cast<BasicBlock>(VMap[ExitBlocks[i]]);
// The new exit block should be in the same loop as the old one.
@ -653,6 +660,19 @@ void LoopUnswitch::UnswitchNontrivialCondition(Value *LIC, Constant *Val,
if (It != VMap.end()) V = It->second;
PN->addIncoming(V, NewExit);
}
if (LandingPadInst *LPad = NewExit->getLandingPadInst()) {
PN = PHINode::Create(LPad->getType(), 0, "",
ExitSucc->getFirstInsertionPt());
for (pred_iterator I = pred_begin(ExitSucc), E = pred_end(ExitSucc);
I != E; ++I) {
BasicBlock *BB = *I;
LandingPadInst *LPI = BB->getLandingPadInst();
LPI->replaceAllUsesWith(PN);
PN->addIncoming(LPI, BB);
}
}
}
// Rewrite the code to refer to itself.

67
test/Transforms/LoopUnswitch/2011-09-26-EHCrash.ll Normal file
View File

@ -0,0 +1,67 @@
; RUN: opt < %s -scalarrepl-ssa -loop-unswitch -disable-output
; PR11016
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-macosx10.7.2"
%class.MyContainer.1.3.19.29 = type { [6 x %class.MyMemVarClass.0.2.18.28*] }
%class.MyMemVarClass.0.2.18.28 = type { i32 }
define void @_ZN11MyContainer1fEi(%class.MyContainer.1.3.19.29* %this, i32 %doit) uwtable ssp align 2 {
entry:
br label %for.cond
for.cond: ; preds = %for.inc, %entry
%inc1 = phi i32 [ %inc, %for.inc ], [ 0, %entry ]
%conv = sext i32 %inc1 to i64
%cmp = icmp ult i64 %conv, 6
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%tobool = icmp ne i32 %doit, 0
br i1 %tobool, label %for.inc, label %if.then
if.then: ; preds = %for.body
%idxprom = sext i32 %inc1 to i64
%array_ = getelementptr inbounds %class.MyContainer.1.3.19.29* %this, i32 0, i32 0
%arrayidx = getelementptr inbounds [6 x %class.MyMemVarClass.0.2.18.28*]* %array_, i32 0, i64 %idxprom
%tmp4 = load %class.MyMemVarClass.0.2.18.28** %arrayidx, align 8, !tbaa !0
%isnull = icmp eq %class.MyMemVarClass.0.2.18.28* %tmp4, null
br i1 %isnull, label %for.inc, label %delete.notnull
delete.notnull: ; preds = %if.then
invoke void @_ZN13MyMemVarClassD1Ev(%class.MyMemVarClass.0.2.18.28* %tmp4)
to label %invoke.cont unwind label %lpad
invoke.cont: ; preds = %delete.notnull
%0 = bitcast %class.MyMemVarClass.0.2.18.28* %tmp4 to i8*
call void @_ZdlPv(i8* %0) nounwind
br label %for.inc
lpad: ; preds = %delete.notnull
%1 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
cleanup
%2 = extractvalue { i8*, i32 } %1, 0
%3 = extractvalue { i8*, i32 } %1, 1
%4 = bitcast %class.MyMemVarClass.0.2.18.28* %tmp4 to i8*
call void @_ZdlPv(i8* %4) nounwind
%lpad.val = insertvalue { i8*, i32 } undef, i8* %2, 0
%lpad.val7 = insertvalue { i8*, i32 } %lpad.val, i32 %3, 1
resume { i8*, i32 } %lpad.val7
for.inc: ; preds = %invoke.cont, %if.then, %for.body
%inc = add nsw i32 %inc1, 1
br label %for.cond
for.end: ; preds = %for.cond
ret void
}
declare void @_ZN13MyMemVarClassD1Ev(%class.MyMemVarClass.0.2.18.28*)
declare i32 @__gxx_personality_v0(...)
declare void @_ZdlPv(i8*) nounwind
!0 = metadata !{metadata !"any pointer", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA", null}