1 ; This testcase is distilled from the GNU rx package. The loop should be
2 ; removed but causes a problem when ADCE does. The source function is:
3 ; int rx_bitset_empty (int size, rx_Bitset set) {
8 ; for (x = rx_bitset_numb_subsets(size) - 1; !set[x]; --x)
14 ; RUN: llvm-upgrade < %s | llvm-as | opt -adce
16 implementation ; Functions:
18 int %rx_bitset_empty(int %size, uint* %set) {
20 %reg110 = load uint* %set ; <uint> [#uses=2]
21 store uint 1, uint* %set
22 %cast112 = cast int %size to ulong ; <ulong> [#uses=1]
23 %reg113 = add ulong %cast112, 31 ; <ulong> [#uses=1]
24 %reg114 = shr ulong %reg113, ubyte 5 ; <ulong> [#uses=2]
25 %cast109 = cast ulong %reg114 to int ; <int> [#uses=1]
26 %reg129 = add int %cast109, -1 ; <int> [#uses=1]
27 %reg114-idxcast = cast ulong %reg114 to uint ; <uint> [#uses=1]
28 %reg114-idxcast-offset = add uint %reg114-idxcast, 1073741823 ; <uint> [#uses=1]
29 %reg114-idxcast-offset = cast uint %reg114-idxcast-offset to long
30 %reg124 = getelementptr uint* %set, long %reg114-idxcast-offset ; <uint*> [#uses=1]
31 %reg125 = load uint* %reg124 ; <uint> [#uses=1]
32 %cond232 = setne uint %reg125, 0 ; <bool> [#uses=1]
33 br bool %cond232, label %bb3, label %bb2
36 %cann-indvar = phi int [ 0, %bb1 ], [ %add1-indvar, %bb2 ] ; <int> [#uses=2]
37 %reg130-scale = mul int %cann-indvar, -1 ; <int> [#uses=1]
38 %reg130 = add int %reg130-scale, %reg129 ; <int> [#uses=1]
39 %add1-indvar = add int %cann-indvar, 1 ; <int> [#uses=1]
40 %reg130-idxcast = cast int %reg130 to uint ; <uint> [#uses=1]
41 %reg130-idxcast-offset = add uint %reg130-idxcast, 1073741823 ; <uint> [#uses=1]
42 %reg130-idxcast-offset = cast uint %reg130-idxcast-offset to long
43 %reg118 = getelementptr uint* %set, long %reg130-idxcast-offset ; <uint*> [#uses=1]
44 %reg119 = load uint* %reg118 ; <uint> [#uses=1]
45 %cond233 = seteq uint %reg119, 0 ; <bool> [#uses=1]
46 br bool %cond233, label %bb2, label %bb3
49 store uint %reg110, uint* %set
50 %cast126 = cast uint %reg110 to ulong ; <ulong> [#uses=1]
51 %reg127 = add ulong %cast126, 18446744073709551615 ; <ulong> [#uses=1]
52 %reg128 = shr ulong %reg127, ubyte 63 ; <ulong> [#uses=1]
53 %cast120 = cast ulong %reg128 to int ; <int> [#uses=1]