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