| ; This testcase is distilled from the GNU rx package. The loop should be |
| ; removed but causes a problem when ADCE does. The source function is: |
| ; int rx_bitset_empty (int size, rx_Bitset set) { |
| ; int x; |
| ; RX_subset s; |
| ; s = set[0]; |
| ; set[0] = 1; |
| ; for (x = rx_bitset_numb_subsets(size) - 1; !set[x]; --x) |
| ; ; |
| ; set[0] = s; |
| ; return !s; |
| ;} |
| ; |
| ; RUN: llvm-as < %s | opt -adce |
| |
| implementation ; Functions: |
| |
| int %rx_bitset_empty(int %size, uint* %set) { |
| bb1: ;[#uses=2] |
| %reg110 = load uint* %set ; <uint> [#uses=2] |
| store uint 1, uint* %set |
| %cast112 = cast int %size to ulong ; <ulong> [#uses=1] |
| %reg113 = add ulong %cast112, 31 ; <ulong> [#uses=1] |
| %reg114 = shr ulong %reg113, ubyte 5 ; <ulong> [#uses=2] |
| %cast109 = cast ulong %reg114 to int ; <int> [#uses=1] |
| %reg129 = add int %cast109, -1 ; <int> [#uses=1] |
| %reg114-idxcast = cast ulong %reg114 to uint ; <uint> [#uses=1] |
| %reg114-idxcast-offset = add uint %reg114-idxcast, 1073741823 ; <uint> [#uses=1] |
| %reg114-idxcast-offset = cast uint %reg114-idxcast-offset to long |
| %reg124 = getelementptr uint* %set, long %reg114-idxcast-offset ; <uint*> [#uses=1] |
| %reg125 = load uint* %reg124 ; <uint> [#uses=1] |
| %cond232 = setne uint %reg125, 0 ; <bool> [#uses=1] |
| br bool %cond232, label %bb3, label %bb2 |
| |
| bb2: ;[#uses=3] |
| %cann-indvar = phi int [ 0, %bb1 ], [ %add1-indvar, %bb2 ] ; <int> [#uses=2] |
| %reg130-scale = mul int %cann-indvar, -1 ; <int> [#uses=1] |
| %reg130 = add int %reg130-scale, %reg129 ; <int> [#uses=1] |
| %add1-indvar = add int %cann-indvar, 1 ; <int> [#uses=1] |
| %reg130-idxcast = cast int %reg130 to uint ; <uint> [#uses=1] |
| %reg130-idxcast-offset = add uint %reg130-idxcast, 1073741823 ; <uint> [#uses=1] |
| %reg130-idxcast-offset = cast uint %reg130-idxcast-offset to long |
| %reg118 = getelementptr uint* %set, long %reg130-idxcast-offset ; <uint*> [#uses=1] |
| %reg119 = load uint* %reg118 ; <uint> [#uses=1] |
| %cond233 = seteq uint %reg119, 0 ; <bool> [#uses=1] |
| br bool %cond233, label %bb2, label %bb3 |
| |
| bb3: ;[#uses=2] |
| store uint %reg110, uint* %set |
| %cast126 = cast uint %reg110 to ulong ; <ulong> [#uses=1] |
| %reg127 = add ulong %cast126, 18446744073709551615 ; <ulong> [#uses=1] |
| %reg128 = shr ulong %reg127, ubyte 63 ; <ulong> [#uses=1] |
| %cast120 = cast ulong %reg128 to int ; <int> [#uses=1] |
| ret int %cast120 |
| |
| } |