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Update dom tree. Fix PR 2372.

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llvm-svn: 51887
This commit is contained in:
Devang Patel 2008-06-02 22:52:56 +00:00
parent 626f8e4454
commit b1798d2be0
2 changed files with 30 additions and 1 deletions
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5
lib/Transforms/Scalar/LoopUnswitch.cpp
View File

@ -569,7 +569,6 @@ void LoopUnswitch::EmitPreheaderBranchOnCondition(Value *LIC, Constant *Val,
// Insert the new branch.
BranchInst::Create(TrueDest, FalseDest, BranchVal, InsertPt);
}
@ -607,6 +606,10 @@ void LoopUnswitch::UnswitchTrivialCondition(Loop *L, Value *Cond,
// insert the new conditional branch.
EmitPreheaderBranchOnCondition(Cond, Val, NewExit, NewPH,
OrigPH->getTerminator());
if (DT) {
DT->changeImmediateDominator(NewExit, OrigPH);
DT->changeImmediateDominator(NewPH, OrigPH);
}
LPM->deleteSimpleAnalysisValue(OrigPH->getTerminator(), L);
OrigPH->getTerminator()->eraseFromParent();

26
test/Transforms/LoopUnswitch/2008-06-02-DomInfo.ll Normal file
View File

@ -0,0 +1,26 @@
; RUN: llvm-as < %s | opt -loop-unswitch -instcombine -gvn -disable-output
; PR2372
target triple = "i386-pc-linux-gnu"
define i32 @func_3(i16 signext %p_5, i16 signext %p_6) nounwind {
entry:
%tmp3 = icmp eq i16 %p_5, 0 ; <i1> [#uses=1]
%tmp1314 = sext i16 %p_6 to i32 ; <i32> [#uses=1]
%tmp28 = icmp ugt i32 %tmp1314, 3 ; <i1> [#uses=1]
%bothcond = or i1 %tmp28, false ; <i1> [#uses=1]
br label %bb
bb: ; preds = %bb54, %entry
br i1 %tmp3, label %bb54, label %bb5
bb5: ; preds = %bb
br i1 %bothcond, label %bb54, label %bb31
bb31: ; preds = %bb5
br label %bb54
bb54: ; preds = %bb31, %bb5, %bb
br i1 false, label %bb64, label %bb
bb64: ; preds = %bb54
%tmp6566 = sext i16 %p_6 to i32 ; <i32> [#uses=1]
%tmp68 = tail call i32 (...)* @func_18( i32 1, i32 %tmp6566, i32 1 ) nounwind ; <i32> [#uses=0]
ret i32 undef
}
declare i32 @func_18(...)