1*f4a2713aSLionel Sambuc; RUN: llc < %s 2*f4a2713aSLionel Sambuc 3*f4a2713aSLionel Sambuc; Examples that exhibits a bug in DAGCombine. The case is triggered by the 4*f4a2713aSLionel Sambuc; following program. The bug is DAGCombine assumes that the bit convert 5*f4a2713aSLionel Sambuc; preserves the number of elements so the optimization code tries to read 6*f4a2713aSLionel Sambuc; through the 3rd mask element, which doesn't exist. 7*f4a2713aSLionel Sambucdefine i32 @update(<2 x i64> %val1, <2 x i64> %val2) nounwind readnone { 8*f4a2713aSLionel Sambucentry: 9*f4a2713aSLionel Sambuc %shuf = shufflevector <2 x i64> %val1, <2 x i64> %val2, <2 x i32> <i32 0, i32 3> 10*f4a2713aSLionel Sambuc %bit = bitcast <2 x i64> %shuf to <4 x i32> 11*f4a2713aSLionel Sambuc %res = extractelement <4 x i32> %bit, i32 3 12*f4a2713aSLionel Sambuc ret i32 %res 13*f4a2713aSLionel Sambuc} 14