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1; RUN: llc < %s2 3; Examples that exhibits a bug in DAGCombine. The case is triggered by the4; following program. The bug is DAGCombine assumes that the bit convert5; preserves the number of elements so the optimization code tries to read6; through the 3rd mask element, which doesn't exist.7define i32 @update(<2 x i64> %val1, <2 x i64> %val2) nounwind readnone {8entry:9 %shuf = shufflevector <2 x i64> %val1, <2 x i64> %val2, <2 x i32> <i32 0, i32 3>10 %bit = bitcast <2 x i64> %shuf to <4 x i32>11 %res = extractelement <4 x i32> %bit, i32 312 ret i32 %res13}14