29 lines
1.2 KiB
LLVM
29 lines
1.2 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.9.0"
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; Test that SCEV is capable of figuring out value of 'IV' that actually does not change.
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define void @foo() {
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; CHECK-LABEL: 'foo'
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; CHECK-NEXT: Classifying expressions for: @foo
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; CHECK-NEXT: %iv.i = phi i64 [ -5, %entry ], [ %iv.next.i, %loop ]
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; CHECK-NEXT: --> -5 U: [-5,-4) S: [-5,-4) Exits: -5 LoopDispositions: { %loop: Invariant }
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; CHECK-NEXT: %iv.next.i = add nsw i64 %iv.i, 0
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; CHECK-NEXT: --> -5 U: [-5,-4) S: [-5,-4) Exits: -5 LoopDispositions: { %loop: Invariant }
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; CHECK-NEXT: Determining loop execution counts for: @foo
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; CHECK-NEXT: Loop %loop: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: Loop %loop: Unpredictable constant max backedge-taken count.
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; CHECK-NEXT: Loop %loop: Unpredictable symbolic max backedge-taken count.
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; CHECK-NEXT: Loop %loop: Unpredictable predicated backedge-taken count.
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;
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entry:
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br label %loop
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loop:
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%iv.i = phi i64 [ -5, %entry ], [ %iv.next.i, %loop ]
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%iv.next.i = add nsw i64 %iv.i, 0
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br label %loop
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}
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