derek.holloway
7502bf64a4
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14 lines
563 B
LLVM
14 lines
563 B
LLVM
; RUN: llc < %s
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; Examples that exhibits a bug in DAGCombine. The case is triggered by the
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; following program. The bug is DAGCombine assumes that the bit convert
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; preserves the number of elements so the optimization code tries to read
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; through the 3rd mask element, which doesn't exist.
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define i32 @update(<2 x i64> %val1, <2 x i64> %val2) nounwind readnone {
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entry:
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%shuf = shufflevector <2 x i64> %val1, <2 x i64> %val2, <2 x i32> <i32 0, i32 3>
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%bit = bitcast <2 x i64> %shuf to <4 x i32>
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%res = extractelement <4 x i32> %bit, i32 3
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ret i32 %res
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}
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