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; 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
}
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