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comparison llvm/test/Transforms/IndVarSimplify/variable-stride-ivs-0.ll @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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children 1f2b6ac9f198
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147:c2174574ed3a 150:1d019706d866
1 ; RUN: opt < %s -indvars -instcombine -S | FileCheck %s
2 ;
3 ; Test that -indvars can reduce variable stride IVs. If it can reduce variable
4 ; stride iv's, it will make %iv. and %m.0.0 isomorphic to each other without
5 ; cycles, allowing the tmp.21 subtraction to be eliminated.
6
7 define void @vnum_test8(i32* %data) {
8 entry:
9 %tmp.1 = getelementptr i32, i32* %data, i32 3 ; <i32*> [#uses=1]
10 %tmp.2 = load i32, i32* %tmp.1 ; <i32> [#uses=2]
11 %tmp.4 = getelementptr i32, i32* %data, i32 4 ; <i32*> [#uses=1]
12 %tmp.5 = load i32, i32* %tmp.4 ; <i32> [#uses=2]
13 %tmp.8 = getelementptr i32, i32* %data, i32 2 ; <i32*> [#uses=1]
14 %tmp.9 = load i32, i32* %tmp.8 ; <i32> [#uses=3]
15 %tmp.125 = icmp sgt i32 %tmp.2, 0 ; <i1> [#uses=1]
16 br i1 %tmp.125, label %no_exit.preheader, label %return
17
18 no_exit.preheader: ; preds = %entry
19 %tmp.16 = getelementptr i32, i32* %data, i32 %tmp.9 ; <i32*> [#uses=1]
20 br label %no_exit
21
22 ; CHECK: store i32 0
23 no_exit: ; preds = %no_exit, %no_exit.preheader
24 %iv.ui = phi i32 [ 0, %no_exit.preheader ], [ %iv..inc.ui, %no_exit ] ; <i32> [#uses=1]
25 %iv. = phi i32 [ %tmp.5, %no_exit.preheader ], [ %iv..inc, %no_exit ] ; <i32> [#uses=2]
26 %m.0.0 = phi i32 [ %tmp.5, %no_exit.preheader ], [ %tmp.24, %no_exit ] ; <i32> [#uses=2]
27 store i32 2, i32* %tmp.16
28 %tmp.21 = sub i32 %m.0.0, %iv. ; <i32> [#uses=1]
29 store i32 %tmp.21, i32* %data
30 %tmp.24 = add i32 %m.0.0, %tmp.9 ; <i32> [#uses=1]
31 %iv..inc = add i32 %tmp.9, %iv. ; <i32> [#uses=1]
32 %iv..inc.ui = add i32 %iv.ui, 1 ; <i32> [#uses=2]
33 %iv..inc1 = bitcast i32 %iv..inc.ui to i32 ; <i32> [#uses=1]
34 %tmp.12 = icmp slt i32 %iv..inc1, %tmp.2 ; <i1> [#uses=1]
35 br i1 %tmp.12, label %no_exit, label %return.loopexit
36
37 return.loopexit: ; preds = %no_exit
38 br label %return
39
40 return: ; preds = %return.loopexit, %entry
41 ret void
42 }
43