| ; RUN: opt < %s -indvars -instcombine -S | FileCheck %s |
| ; |
| ; Test that -indvars can reduce variable stride IVs. If it can reduce variable |
| ; stride iv's, it will make %iv. and %m.0.0 isomorphic to each other without |
| ; cycles, allowing the tmp.21 subtraction to be eliminated. |
| |
| define void @vnum_test8(i32* %data) { |
| entry: |
| %tmp.1 = getelementptr i32, i32* %data, i32 3 ; <i32*> [#uses=1] |
| %tmp.2 = load i32, i32* %tmp.1 ; <i32> [#uses=2] |
| %tmp.4 = getelementptr i32, i32* %data, i32 4 ; <i32*> [#uses=1] |
| %tmp.5 = load i32, i32* %tmp.4 ; <i32> [#uses=2] |
| %tmp.8 = getelementptr i32, i32* %data, i32 2 ; <i32*> [#uses=1] |
| %tmp.9 = load i32, i32* %tmp.8 ; <i32> [#uses=3] |
| %tmp.125 = icmp sgt i32 %tmp.2, 0 ; <i1> [#uses=1] |
| br i1 %tmp.125, label %no_exit.preheader, label %return |
| |
| no_exit.preheader: ; preds = %entry |
| %tmp.16 = getelementptr i32, i32* %data, i32 %tmp.9 ; <i32*> [#uses=1] |
| br label %no_exit |
| |
| ; CHECK: store i32 0 |
| no_exit: ; preds = %no_exit, %no_exit.preheader |
| %iv.ui = phi i32 [ 0, %no_exit.preheader ], [ %iv..inc.ui, %no_exit ] ; <i32> [#uses=1] |
| %iv. = phi i32 [ %tmp.5, %no_exit.preheader ], [ %iv..inc, %no_exit ] ; <i32> [#uses=2] |
| %m.0.0 = phi i32 [ %tmp.5, %no_exit.preheader ], [ %tmp.24, %no_exit ] ; <i32> [#uses=2] |
| store i32 2, i32* %tmp.16 |
| %tmp.21 = sub i32 %m.0.0, %iv. ; <i32> [#uses=1] |
| store i32 %tmp.21, i32* %data |
| %tmp.24 = add i32 %m.0.0, %tmp.9 ; <i32> [#uses=1] |
| %iv..inc = add i32 %tmp.9, %iv. ; <i32> [#uses=1] |
| %iv..inc.ui = add i32 %iv.ui, 1 ; <i32> [#uses=2] |
| %iv..inc1 = bitcast i32 %iv..inc.ui to i32 ; <i32> [#uses=1] |
| %tmp.12 = icmp slt i32 %iv..inc1, %tmp.2 ; <i1> [#uses=1] |
| br i1 %tmp.12, label %no_exit, label %return.loopexit |
| |
| return.loopexit: ; preds = %no_exit |
| br label %return |
| |
| return: ; preds = %return.loopexit, %entry |
| ret void |
| } |
| |
