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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
define void @f(i1 %c) {
; CHECK-LABEL: 'f'
; CHECK-NEXT: Classifying expressions for: @f
; CHECK-NEXT: %start = select i1 %c, i32 100, i32 0
; CHECK-NEXT: --> %start U: [0,101) S: [0,101)
; CHECK-NEXT: %step = select i1 %c, i32 -1, i32 1
; CHECK-NEXT: --> %step U: [1,0) S: [-2,2)
; CHECK-NEXT: %iv = phi i32 [ %start, %entry ], [ %iv.dec, %loop ]
; CHECK-NEXT: --> {%start,+,%step}<nsw><%loop> U: [0,101) S: [0,101) Exits: ((99 * %step)<nsw> + %start) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv.tc = phi i32 [ 0, %entry ], [ %iv.tc.inc, %loop ]
; CHECK-NEXT: --> {0,+,1}<nuw><nsw><%loop> U: [0,100) S: [0,100) Exits: 99 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv.tc.inc = add i32 %iv.tc, 1
; CHECK-NEXT: --> {1,+,1}<nuw><nsw><%loop> U: [1,101) S: [1,101) Exits: 100 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv.dec = add nsw i32 %iv, %step
; CHECK-NEXT: --> {(%step + %start),+,%step}<nw><%loop> U: [-200,201) S: [-200,201) Exits: ((100 * %step)<nsw> + %start) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv.sext = sext i32 %iv to i64
; CHECK-NEXT: --> {(zext i32 %start to i64),+,(sext i32 %step to i64)}<nsw><%loop> U: [0,101) S: [0,101) Exits: ((zext i32 %start to i64) + (99 * (sext i32 %step to i64))<nsw>) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: Determining loop execution counts for: @f
; CHECK-NEXT: Loop %loop: backedge-taken count is i32 99
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is i32 99
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is i32 99
; CHECK-NEXT: Loop %loop: Trip multiple is 100
;
entry:
%start = select i1 %c, i32 100, i32 0
%step = select i1 %c, i32 -1, i32 1
br label %loop
loop:
%iv = phi i32 [ %start, %entry ], [ %iv.dec, %loop ]
%iv.tc = phi i32 [ 0, %entry ], [ %iv.tc.inc, %loop ]
%iv.tc.inc = add i32 %iv.tc, 1
%iv.dec = add nsw i32 %iv, %step
%iv.sext = sext i32 %iv to i64
%be = icmp ne i32 %iv.tc.inc, 100
br i1 %be, label %loop, label %leave
leave:
ret void
}
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