test/Analysis/ScalarEvolution/sext-to-zext.ll

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt -analyze -enable-new-pm=0 -scalar-evolution < %s | FileCheck %s
; 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: [-128,128)
; 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}<%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}<%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: [-328,228) S: [-328,228) Exits: ((100 * %step)<nsw> + %start) LoopDispositions: { %loop: Computable }
; CHECK-NEXT:    %iv.sext = sext i32 %iv to i64
; CHECK-NEXT:    --> {(sext i32 %start to i64),+,(sext i32 %step to i64)}<nsw><%loop> U: [0,101) S: [0,101) Exits: ((sext 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 99
; CHECK-NEXT:  Loop %loop: max backedge-taken count is 99
; CHECK-NEXT:  Loop %loop: Predicated backedge-taken count is 99
; CHECK-NEXT:   Predicates:
; CHECK:       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
}