derek.holloway
7502bf64a4
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44 lines
2.2 KiB
LLVM
44 lines
2.2 KiB
LLVM
; RUN: opt < %s -passes='loop(indvars),instcombine' -S | FileCheck %s
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;
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; Test that -passes=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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define void @vnum_test8(ptr %data) {
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entry:
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%tmp.1 = getelementptr i32, ptr %data, i32 3 ; <ptr> [#uses=1]
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%tmp.2 = load i32, ptr %tmp.1 ; <i32> [#uses=2]
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%tmp.4 = getelementptr i32, ptr %data, i32 4 ; <ptr> [#uses=1]
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%tmp.5 = load i32, ptr %tmp.4 ; <i32> [#uses=2]
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%tmp.8 = getelementptr i32, ptr %data, i32 2 ; <ptr> [#uses=1]
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%tmp.9 = load i32, ptr %tmp.8 ; <i32> [#uses=3]
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%tmp.125 = icmp sgt i32 %tmp.2, 0 ; <i1> [#uses=1]
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br i1 %tmp.125, label %no_exit.preheader, label %return
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no_exit.preheader: ; preds = %entry
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%tmp.16 = getelementptr i32, ptr %data, i32 %tmp.9 ; <ptr> [#uses=1]
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br label %no_exit
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; CHECK: store i32 0
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no_exit: ; preds = %no_exit, %no_exit.preheader
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%iv.ui = phi i32 [ 0, %no_exit.preheader ], [ %iv..inc.ui, %no_exit ] ; <i32> [#uses=1]
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%iv. = phi i32 [ %tmp.5, %no_exit.preheader ], [ %iv..inc, %no_exit ] ; <i32> [#uses=2]
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%m.0.0 = phi i32 [ %tmp.5, %no_exit.preheader ], [ %tmp.24, %no_exit ] ; <i32> [#uses=2]
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store i32 2, ptr %tmp.16
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%tmp.21 = sub i32 %m.0.0, %iv. ; <i32> [#uses=1]
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store i32 %tmp.21, ptr %data
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%tmp.24 = add i32 %m.0.0, %tmp.9 ; <i32> [#uses=1]
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%iv..inc = add i32 %tmp.9, %iv. ; <i32> [#uses=1]
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%iv..inc.ui = add i32 %iv.ui, 1 ; <i32> [#uses=2]
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%iv..inc1 = bitcast i32 %iv..inc.ui to i32 ; <i32> [#uses=1]
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%tmp.12 = icmp slt i32 %iv..inc1, %tmp.2 ; <i1> [#uses=1]
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br i1 %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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