derek.holloway
7502bf64a4
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32 lines
1.3 KiB
LLVM
32 lines
1.3 KiB
LLVM
; RUN: llc -mtriple aarch64 -o /dev/null %s
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; This used to fail with:
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; Assertion `N1.getOpcode() != ISD::DELETED_NODE &&
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; "Operand is DELETED_NODE!"' failed.
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; Just make sure we do not crash here.
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define void @test_fold_freeze_over_select_cc(i15 %a, ptr %p1, ptr %p2) {
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entry:
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%a2 = add nsw i15 %a, 1
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%sext = sext i15 %a2 to i32
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%ashr = ashr i32 %sext, 31
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%lshr = lshr i32 %ashr, 7
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; Setup an already frozen input to ctlz.
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%freeze = freeze i32 %lshr
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%ctlz = call i32 @llvm.ctlz.i32(i32 %freeze, i1 true)
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store i32 %ctlz, ptr %p1, align 1
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; Here is another ctlz, which is used by a frozen select.
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; DAGCombiner::visitFREEZE will to try to fold the freeze over a SELECT_CC,
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; and when dealing with the condition operand the other SELECT_CC operands
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; will be replaced/simplified as well. So the SELECT_CC is mutated while
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; freezing the "maybe poison operands". This needs to be handled by
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; DAGCombiner::visitFREEZE, as it can't store the list of SDValues that
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; should be frozen in a separate data structure that isn't updated when the
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; SELECT_CC is mutated.
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%ctlz1 = call i32 @llvm.ctlz.i32(i32 %lshr, i1 true)
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%icmp = icmp ne i32 %lshr, 0
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%select = select i1 %icmp, i32 %ctlz1, i32 0
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%freeze1 = freeze i32 %select
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store i32 %freeze1, ptr %p2, align 1
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ret void
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}
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