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Make sure that we don't call getZExtValue on values > 64 bits.
Thanks Benjamin for noticing this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162749 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -462,11 +462,11 @@ Instruction *InstCombiner::visitUDiv(BinaryOperator &I) {
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}
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}
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// Udiv ((Lshl x, c1) , c2) -> x / (C1 * 1<<C2);
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if (Constant *C = dyn_cast<Constant>(Op1)) {
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// Udiv ((Lshl x, C1) , C2) -> x / (C2 * 1<<C1);
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if (ConstantInt *C2 = dyn_cast<ConstantInt>(Op1)) {
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Value *X = 0, *C1 = 0;
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if (match(Op0, m_LShr(m_Value(X), m_Value(C1)))) {
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uint64_t NC = cast<ConstantInt>(C)->getZExtValue() *
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if (match(Op0, m_LShr(m_Value(X), m_Value(C1))) && C2->getBitWidth() < 65) {
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uint64_t NC = cast<ConstantInt>(C2)->getZExtValue() *
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(1<< cast<ConstantInt>(C1)->getZExtValue());
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return BinaryOperator::CreateUDiv(X, ConstantInt::get(I.getType(), NC));
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}
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@ -543,11 +543,11 @@ Instruction *InstCombiner::visitSDiv(BinaryOperator &I) {
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ConstantExpr::getNeg(RHS));
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}
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// Sdiv ((Ashl x, c1) , c2) -> x / (C1 * 1<<C2);
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if (Constant *C = dyn_cast<Constant>(Op1)) {
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// Sdiv ((Ashl x, C1) , C2) -> x / (C2 * 1<<C1);
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if (ConstantInt *C2 = dyn_cast<ConstantInt>(Op1)) {
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Value *X = 0, *C1 = 0;
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if (match(Op0, m_AShr(m_Value(X), m_Value(C1)))) {
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uint64_t NC = cast<ConstantInt>(C)->getZExtValue() *
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if (match(Op0, m_AShr(m_Value(X), m_Value(C1))) && C2->getBitWidth() < 65) {
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uint64_t NC = cast<ConstantInt>(C2)->getZExtValue() *
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(1<< cast<ConstantInt>(C1)->getZExtValue());
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return BinaryOperator::CreateSDiv(X, ConstantInt::get(I.getType(), NC));
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}
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@ -48,3 +48,10 @@ entry:
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%div1 = sdiv i32 %div, 100
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ret i32 %div1
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}
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define i80 @no_crash_i80(i80 %x) {
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entry:
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%div = lshr i80 %x, 2
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%div1 = udiv i80 %div, 100
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ret i80 %div1
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}
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