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42 lines
2.1 KiB
LLVM
42 lines
2.1 KiB
LLVM
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; RUN: llvm-as < %s | opt -indvars -instcombine | llvm-dis | grep 'store int 0'
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; Test that -indvars can reduce variable stride IVs. If it can reduce variable
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; stride iv's, it will make %iv. and %m.0.0 isomorphic to each other without
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; cycles, allowing the tmp.21 subtraction to be eliminated.
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void %vnum_test8(int* %data) {
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entry:
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%tmp.1 = getelementptr int* %data, int 3 ; <int*> [#uses=1]
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%tmp.2 = load int* %tmp.1 ; <int> [#uses=2]
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%tmp.4 = getelementptr int* %data, int 4 ; <int*> [#uses=1]
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%tmp.5 = load int* %tmp.4 ; <int> [#uses=2]
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%tmp.8 = getelementptr int* %data, int 2 ; <int*> [#uses=1]
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%tmp.9 = load int* %tmp.8 ; <int> [#uses=3]
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%tmp.125 = setgt int %tmp.2, 0 ; <bool> [#uses=1]
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br bool %tmp.125, label %no_exit.preheader, label %return
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no_exit.preheader: ; preds = %entry
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%tmp.16 = getelementptr int* %data, int %tmp.9 ; <int*> [#uses=1]
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br label %no_exit
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no_exit: ; preds = %no_exit, %no_exit.preheader
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%iv. = phi uint [ 0, %no_exit.preheader ], [ %iv..inc, %no_exit ] ; <uint> [#uses=1]
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%iv. = phi int [ %tmp.5, %no_exit.preheader ], [ %iv..inc, %no_exit ] ; <int> [#uses=2]
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%m.0.0 = phi int [ %tmp.5, %no_exit.preheader ], [ %tmp.24, %no_exit ] ; <int> [#uses=2]
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store int 2, int* %tmp.16
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%tmp.21 = sub int %m.0.0, %iv. ; <int> [#uses=1]
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store int %tmp.21, int* %data
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%tmp.24 = add int %m.0.0, %tmp.9 ; <int> [#uses=1]
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%iv..inc = add int %tmp.9, %iv. ; <int> [#uses=1]
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%iv..inc = add uint %iv., 1 ; <uint> [#uses=2]
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%iv..inc1 = cast uint %iv..inc to int ; <int> [#uses=1]
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%tmp.12 = setlt int %iv..inc1, %tmp.2 ; <bool> [#uses=1]
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br bool %tmp.12, label %no_exit, label %return.loopexit
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return.loopexit: ; preds = %no_exit
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br label %return
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return: ; preds = %return.loopexit, %entry
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ret void
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}
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