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Fix PR 1995.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46898 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1392,6 +1392,11 @@ bool LoopIndexSplit::splitLoop(SplitInfo &SD) {
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if (!Succ0->getSinglePredecessor() || !Succ1->getSinglePredecessor())
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if (!Succ0->getSinglePredecessor() || !Succ1->getSinglePredecessor())
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return false;
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return false;
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// If Exiting block includes loop variant instructions then this
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// loop may not be split safely.
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if (!safeExitingBlock(SD, ExitCondition->getParent()))
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return false;
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// After loop is cloned there are two loops.
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// After loop is cloned there are two loops.
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//
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//
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// First loop, referred as ALoop, executes first part of loop's iteration
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// First loop, referred as ALoop, executes first part of loop's iteration
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@ -1616,8 +1621,8 @@ void LoopIndexSplit::moveExitCondition(BasicBlock *CondBB, BasicBlock *ActiveBB,
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/// - ExitBB's single predecessor was Latch
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/// - ExitBB's single predecessor was Latch
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/// - Latch's second successor was Header
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/// - Latch's second successor was Header
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/// Now
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/// Now
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/// - ExitBB's single predecessor was Header
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/// - ExitBB's single predecessor is Header
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/// - Latch's one and only successor was Header
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/// - Latch's one and only successor is Header
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///
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///
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/// Update ExitBB PHINodes' to reflect this change.
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/// Update ExitBB PHINodes' to reflect this change.
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void LoopIndexSplit::updatePHINodes(BasicBlock *ExitBB, BasicBlock *Latch,
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void LoopIndexSplit::updatePHINodes(BasicBlock *ExitBB, BasicBlock *Latch,
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@ -1632,27 +1637,18 @@ void LoopIndexSplit::updatePHINodes(BasicBlock *ExitBB, BasicBlock *Latch,
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Value *V = PN->getIncomingValueForBlock(Latch);
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Value *V = PN->getIncomingValueForBlock(Latch);
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if (PHINode *PHV = dyn_cast<PHINode>(V)) {
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if (PHINode *PHV = dyn_cast<PHINode>(V)) {
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// PHV is in Latch. PHV has two uses, one use is in ExitBB PHINode
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// PHV is in Latch. PHV has one use is in ExitBB PHINode. And one use
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// (i.e. PN :)).
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// in Header which is new incoming value for PN.
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// The second use is in Header and it is new incoming value for PN.
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PHINode *U1 = NULL;
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PHINode *U2 = NULL;
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Value *NewV = NULL;
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Value *NewV = NULL;
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for (Value::use_iterator UI = PHV->use_begin(), E = PHV->use_end();
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for (Value::use_iterator UI = PHV->use_begin(), E = PHV->use_end();
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UI != E; ++UI) {
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UI != E; ++UI)
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if (!U1)
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if (PHINode *U = dyn_cast<PHINode>(*UI))
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U1 = cast<PHINode>(*UI);
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if (U->getParent() == Header) {
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else if (!U2)
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NewV = U;
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U2 = cast<PHINode>(*UI);
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break;
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else
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}
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assert ( 0 && "Unexpected third use of this PHINode");
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}
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assert (U1 && U2 && "Unable to find two uses");
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if (U1->getParent() == Header)
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assert (NewV && "Unable to find new incoming value for exit block PHI");
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NewV = U1;
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else
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NewV = U2;
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PN->addIncoming(NewV, Header);
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PN->addIncoming(NewV, Header);
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} else if (Instruction *PHI = dyn_cast<Instruction>(V)) {
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} else if (Instruction *PHI = dyn_cast<Instruction>(V)) {
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48
test/Transforms/LoopIndexSplit/2008-02-08-Crash.ll
Normal file
48
test/Transforms/LoopIndexSplit/2008-02-08-Crash.ll
Normal file
@ -0,0 +1,48 @@
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; RUN: llvm-as < %s | opt -loop-index-split -disable-output
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; PR 1995
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define void @add_blkdev_randomness(i32 %major) nounwind {
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entry:
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br label %bb
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bb: ; preds = %bb39, %entry
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%A.0.reg2mem.0 = phi i32 [ undef, %entry ], [ %TEMP.0, %bb39 ] ; <i32> [#uses=1]
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%D.0.reg2mem.0 = phi i32 [ undef, %entry ], [ %C.0.reg2mem.0, %bb39 ] ; <i32> [#uses=3]
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%C.0.reg2mem.0 = phi i32 [ undef, %entry ], [ %tmp34, %bb39 ] ; <i32> [#uses=4]
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%TEMP.1.reg2mem.0 = phi i32 [ undef, %entry ], [ %TEMP.0, %bb39 ] ; <i32> [#uses=1]
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%i.0.reg2mem.0 = phi i32 [ 0, %entry ], [ %tmp38, %bb39 ] ; <i32> [#uses=3]
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%B.0.reg2mem.0 = phi i32 [ undef, %entry ], [ %A.0.reg2mem.0, %bb39 ] ; <i32> [#uses=5]
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%tmp1 = icmp slt i32 %i.0.reg2mem.0, 40 ; <i1> [#uses=1]
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br i1 %tmp1, label %bb3, label %bb12
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bb3: ; preds = %bb
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%tmp6 = xor i32 %C.0.reg2mem.0, %D.0.reg2mem.0 ; <i32> [#uses=1]
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%tmp8 = and i32 %B.0.reg2mem.0, %tmp6 ; <i32> [#uses=1]
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%tmp10 = xor i32 %tmp8, %D.0.reg2mem.0 ; <i32> [#uses=1]
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%tmp11 = add i32 %tmp10, 1518500249 ; <i32> [#uses=1]
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br label %bb39
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bb12: ; preds = %bb
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%tmp14 = icmp slt i32 %i.0.reg2mem.0, 60 ; <i1> [#uses=1]
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br i1 %tmp14, label %bb17, label %bb39
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bb17: ; preds = %bb12
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%tmp20 = and i32 %B.0.reg2mem.0, %C.0.reg2mem.0 ; <i32> [#uses=1]
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%tmp23 = xor i32 %B.0.reg2mem.0, %C.0.reg2mem.0 ; <i32> [#uses=1]
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%tmp25 = and i32 %tmp23, %D.0.reg2mem.0 ; <i32> [#uses=1]
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%tmp26 = add i32 %tmp20, -1894007588 ; <i32> [#uses=1]
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%tmp27 = add i32 %tmp26, %tmp25 ; <i32> [#uses=1]
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br label %bb39
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bb39: ; preds = %bb12, %bb3, %bb17
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%TEMP.0 = phi i32 [ %tmp27, %bb17 ], [ %tmp11, %bb3 ], [ %TEMP.1.reg2mem.0, %bb12 ] ; <i32> [#uses=2]
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%tmp31 = lshr i32 %B.0.reg2mem.0, 2 ; <i32> [#uses=1]
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%tmp33 = shl i32 %B.0.reg2mem.0, 30 ; <i32> [#uses=1]
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%tmp34 = or i32 %tmp31, %tmp33 ; <i32> [#uses=1]
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%tmp38 = add i32 %i.0.reg2mem.0, 1 ; <i32> [#uses=2]
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%tmp41 = icmp slt i32 %tmp38, 80 ; <i1> [#uses=1]
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br i1 %tmp41, label %bb, label %return
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return: ; preds = %bb39
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ret void
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}
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