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LSR: teach isSimplifiedLoopNest to handle PHI IVUsers.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153132 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-03-20 21:24:44 +00:00
parent f9492288bb
commit a3b10b8359
2 changed files with 40 additions and 1 deletions
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9
lib/Analysis/IVUsers.cpp
View File

@ -148,7 +148,14 @@ bool IVUsers::AddUsersIfInteresting(Instruction *I,
// Only consider IVUsers that are dominated by simplified loop
// headers. Otherwise, SCEVExpander will crash.
if (!isSimplifiedLoopNest(User->getParent(), DT, LI, SimpleLoopNests))
BasicBlock *UseBB = User->getParent();
// A phi's use is live out of its predecessor block.
if (PHINode *PHI = dyn_cast<PHINode>(User)) {
unsigned OperandNo = UI.getOperandNo();
unsigned ValNo = PHINode::getIncomingValueNumForOperand(OperandNo);
UseBB = PHI->getIncomingBlock(ValNo);
}
if (!isSimplifiedLoopNest(UseBB, DT, LI, SimpleLoopNests))
return false;
// Descend recursively, but not into PHI nodes outside the current loop.

32
test/Transforms/LoopStrengthReduce/2012-03-15-nopreheader.ll
View File

@ -49,6 +49,8 @@ return: ; preds = %if.end677, %doshell
ret void
}
; Another case with a dominating loop that does not contain the IV
; User. Just make sure it doesn't assert.
define void @nopreheader2() nounwind ssp {
entry:
indirectbr i8* undef, [label %while.cond, label %return]
@ -121,3 +123,33 @@ while.body94: ; preds = %lor.rhs87, %while.c
return: ; preds = %if.end216, %land.lhs.true183, %land.lhs.true, %while.end52, %lor.lhs.false, %while.end, %entry
ret void
}
; Test a phi operand IV User dominated by a no-preheader loop.
define void @nopreheader3() nounwind uwtable ssp align 2 {
entry:
indirectbr i8* blockaddress(@nopreheader3, %if.end10), [label %if.end22, label %if.end10]
if.end10: ; preds = %entry
indirectbr i8* blockaddress(@nopreheader3, %if.end6.i), [label %if.end22, label %if.end6.i]
if.end6.i: ; preds = %if.end10
indirectbr i8* blockaddress(@nopreheader3, %while.cond2.preheader.i.i), [label %if.then12, label %while.cond2.preheader.i.i]
while.cond2.preheader.i.i: ; preds = %while.end.i18.i, %if.end6.i
indirectbr i8* blockaddress(@nopreheader3, %while.cond2.i.i), [label %while.cond2.i.i]
while.cond2.i.i: ; preds = %while.cond2.i.i, %while.cond2.preheader.i.i
%i1.1.i14.i = phi i32 [ %add.i15.i, %while.cond2.i.i ], [ undef, %while.cond2.preheader.i.i ]
%add.i15.i = add nsw i32 %i1.1.i14.i, undef
indirectbr i8* blockaddress(@nopreheader3, %while.end.i18.i), [label %while.cond2.i.i, label %while.end.i18.i]
while.end.i18.i: ; preds = %while.cond2.i.i
indirectbr i8* blockaddress(@nopreheader3, %while.cond2.preheader.i.i), [label %if.then12, label %while.cond2.preheader.i.i]
if.then12: ; preds = %while.end.i18.i, %if.end6.i
%i1.0.lcssa.i.i = phi i32 [ undef, %if.end6.i ], [ %i1.1.i14.i, %while.end.i18.i ]
indirectbr i8* blockaddress(@nopreheader3, %if.end22), [label %if.end22]
if.end22: ; preds = %if.then12, %if.end10, %entry
ret void
}