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