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