1; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py 2; RUN: opt -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s 3 4target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 5target triple = "x86_64-apple-macosx10.9.0" 6 7; Test that SCEV is capable of figuring out value of 'IV' that actually does not change. 8define void @foo() { 9; CHECK-LABEL: 'foo' 10; CHECK-NEXT: Classifying expressions for: @foo 11; CHECK-NEXT: %iv.i = phi i64 [ -5, %entry ], [ %iv.next.i, %loop ] 12; CHECK-NEXT: --> -5 U: [-5,-4) S: [-5,-4) Exits: -5 LoopDispositions: { %loop: Invariant } 13; CHECK-NEXT: %iv.next.i = add nsw i64 %iv.i, 0 14; CHECK-NEXT: --> -5 U: [-5,-4) S: [-5,-4) Exits: -5 LoopDispositions: { %loop: Invariant } 15; CHECK-NEXT: Determining loop execution counts for: @foo 16; CHECK-NEXT: Loop %loop: <multiple exits> Unpredictable backedge-taken count. 17; CHECK-NEXT: Loop %loop: Unpredictable constant max backedge-taken count. 18; CHECK-NEXT: Loop %loop: Unpredictable symbolic max backedge-taken count. 19; 20entry: 21 br label %loop 22 23loop: 24 %iv.i = phi i64 [ -5, %entry ], [ %iv.next.i, %loop ] 25 %iv.next.i = add nsw i64 %iv.i, 0 26 br label %loop 27} 28