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[indvars] Fix PR10946: SCEV cannot handle Vector IVs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140026 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -85,6 +85,8 @@ namespace {
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/// foldIVUser - Fold an IV operand into its use. This removes increments of an
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/// aligned IV when used by a instruction that ignores the low bits.
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///
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/// IVOperand is guaranteed SCEVable, but UseInst may not be.
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///
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/// Return the operand of IVOperand for this induction variable if IVOperand can
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/// be folded (in case more folding opportunities have been exposed).
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/// Otherwise return null.
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@ -241,6 +243,7 @@ void SimplifyIndvar::eliminateIVRemainder(BinaryOperator *Rem,
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/// eliminateIVUser - Eliminate an operation that consumes a simple IV and has
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/// no observable side-effect given the range of IV values.
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/// IVOperand is guaranteed SCEVable, but UseInst may not be.
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bool SimplifyIndvar::eliminateIVUser(Instruction *UseInst,
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Instruction *IVOperand) {
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if (ICmpInst *ICmp = dyn_cast<ICmpInst>(UseInst)) {
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@ -324,6 +327,9 @@ static bool isSimpleIVUser(Instruction *I, const Loop *L, ScalarEvolution *SE) {
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/// Once DisableIVRewrite is default, LSR will be the only client of IVUsers.
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///
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void SimplifyIndvar::simplifyUsers(PHINode *CurrIV, IVVisitor *V) {
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if (!SE->isSCEVable(CurrIV->getType()))
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return;
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// Instructions processed by SimplifyIndvar for CurrIV.
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SmallPtrSet<Instruction*,16> Simplified;
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16
test/Transforms/IndVarSimplify/2011-09-19-vectoriv.ll
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16
test/Transforms/IndVarSimplify/2011-09-19-vectoriv.ll
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@ -0,0 +1,16 @@
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; RUN: opt < %s -indvars -S | FileCheck %s
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; PR10946: Vector IVs are not SCEVable.
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; CHECK-NOT: phi
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define void @test() nounwind {
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allocas:
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br i1 undef, label %cif_done, label %for_loop398
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cif_done: ; preds = %allocas
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ret void
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for_loop398: ; preds = %for_loop398, %allocas
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%storemerge35 = phi <4 x i32> [ %storemerge, %for_loop398 ], [ undef, %allocas ]
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%bincmp431 = icmp sge <4 x i32> %storemerge35, <i32 5, i32 5, i32 5, i32 5>
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%storemerge = bitcast <4 x float> undef to <4 x i32>
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br label %for_loop398
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}
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