llvm/test/Analysis/ScalarEvolution/ne-overflow.ll

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt %s -passes='print<scalar-evolution>' -scalar-evolution-classify-expressions=0 -disable-output 2>&1 | FileCheck %s

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; A collection of tests focused on exercising logic to prove no-unsigned wrap
; from mustprogress semantics of loops.

define void @test(i32 %N) mustprogress {
; CHECK-LABEL: 'test'
; CHECK-NEXT:  Determining loop execution counts for: @test
; CHECK-NEXT:  Loop %for.body: backedge-taken count is ((-2 + %N) /u 2)
; CHECK-NEXT:  Loop %for.body: max backedge-taken count is 2147483647
; CHECK-NEXT:  Loop %for.body: Predicated backedge-taken count is ((-2 + %N) /u 2)
; CHECK-NEXT:   Predicates:
; CHECK:       Loop %for.body: Trip multiple is 1
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %cmp = icmp ne i32 %iv.next, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_preinc(i32 %N) mustprogress {
; CHECK-LABEL: 'test_preinc'
; CHECK-NEXT:  Determining loop execution counts for: @test_preinc
; CHECK-NEXT:  Loop %for.body: backedge-taken count is (%N /u 2)
; CHECK-NEXT:  Loop %for.body: max backedge-taken count is 2147483647
; CHECK-NEXT:  Loop %for.body: Predicated backedge-taken count is (%N /u 2)
; CHECK-NEXT:   Predicates:
; CHECK:       Loop %for.body: Trip multiple is 1
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %cmp = icmp ne i32 %iv, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void

}

@G = external global i32

define void @test_well_defined_infinite_st(i32 %N) mustprogress {
; CHECK-LABEL: 'test_well_defined_infinite_st'
; CHECK-NEXT:  Determining loop execution counts for: @test_well_defined_infinite_st
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  store volatile i32 0, i32* @G
  %cmp = icmp ne i32 %iv.next, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_well_defined_infinite_ld(i32 %N) mustprogress {
; CHECK-LABEL: 'test_well_defined_infinite_ld'
; CHECK-NEXT:  Determining loop execution counts for: @test_well_defined_infinite_ld
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %val = load volatile i32, i32* @G
  %cmp = icmp ne i32 %iv.next, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_no_mustprogress(i32 %N) {
; CHECK-LABEL: 'test_no_mustprogress'
; CHECK-NEXT:  Determining loop execution counts for: @test_no_mustprogress
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %cmp = icmp ne i32 %iv.next, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void

}


define void @test_1024(i32 %N) mustprogress {
; CHECK-LABEL: 'test_1024'
; CHECK-NEXT:  Determining loop execution counts for: @test_1024
; CHECK-NEXT:  Loop %for.body: backedge-taken count is ((-1024 + %N) /u 1024)
; CHECK-NEXT:  Loop %for.body: max backedge-taken count is 4194303
; CHECK-NEXT:  Loop %for.body: Predicated backedge-taken count is ((-1024 + %N) /u 1024)
; CHECK-NEXT:   Predicates:
; CHECK:       Loop %for.body: Trip multiple is 1
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 1024
  %cmp = icmp ne i32 %iv.next, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_uneven_divide(i32 %N) mustprogress {
; CHECK-LABEL: 'test_uneven_divide'
; CHECK-NEXT:  Determining loop execution counts for: @test_uneven_divide
; CHECK-NEXT:  Loop %for.body: backedge-taken count is (-1 + (-1431655765 * %N))
; CHECK-NEXT:  Loop %for.body: max backedge-taken count is -1
; CHECK-NEXT:  Loop %for.body: Predicated backedge-taken count is (-1 + (-1431655765 * %N))
; CHECK-NEXT:   Predicates:
; CHECK:       Loop %for.body: Trip multiple is 1
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 3
  %cmp = icmp ne i32 %iv.next, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_non_invariant_rhs() mustprogress {
; CHECK-LABEL: 'test_non_invariant_rhs'
; CHECK-NEXT:  Determining loop execution counts for: @test_non_invariant_rhs
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %N = load i32, i32* @G
  %cmp = icmp ne i32 %iv.next, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

declare void @mayexit()

define void @test_abnormal_exit(i32 %N) mustprogress {
; CHECK-LABEL: 'test_abnormal_exit'
; CHECK-NEXT:  Determining loop execution counts for: @test_abnormal_exit
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  call void @mayexit()
  %cmp = icmp ne i32 %iv.next, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}


define void @test_other_exit(i32 %N) mustprogress {
; CHECK-LABEL: 'test_other_exit'
; CHECK-NEXT:  Determining loop execution counts for: @test_other_exit
; CHECK-NEXT:  Loop %for.body: <multiple exits> Unpredictable backedge-taken count.
; CHECK-NEXT:    exit count for for.body: 9
; CHECK-NEXT:    exit count for for.latch: ***COULDNOTCOMPUTE***
; CHECK-NEXT:  Loop %for.body: max backedge-taken count is 9
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.latch ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %cmp1 = icmp ne i32 %iv.next, 20
  br i1 %cmp1, label %for.latch, label %for.cond.cleanup

for.latch:
  %cmp2 = icmp ne i32 %iv.next, %N
  br i1 %cmp2, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_zext(i64 %N) mustprogress {
; CHECK-LABEL: 'test_zext'
; CHECK-NEXT:  Determining loop execution counts for: @test_zext
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Predicated backedge-taken count is (%N /u 2)
; CHECK-NEXT:   Predicates:
; CHECK-NEXT:    {0,+,2}<nuw><%for.body> Added Flags: <nusw>
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %zext = zext i32 %iv to i64
  %cmp = icmp ne i64 %zext, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_sext(i64 %N) mustprogress {
; CHECK-LABEL: 'test_sext'
; CHECK-NEXT:  Determining loop execution counts for: @test_sext
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %sext = sext i32 %iv to i64
  %cmp = icmp ne i64 %sext, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_zext_of_sext(i64 %N) mustprogress {
; CHECK-LABEL: 'test_zext_of_sext'
; CHECK-NEXT:  Determining loop execution counts for: @test_zext_of_sext
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %sext = sext i32 %iv to i48
  %zext = zext i48 %sext to i64
  %cmp = icmp ne i64 %zext, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_zext_offset(i64 %N) mustprogress {
; CHECK-LABEL: 'test_zext_offset'
; CHECK-NEXT:  Determining loop execution counts for: @test_zext_offset
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %zext = zext i32 %iv to i64
  %offset = add i64 %zext, 21
  %cmp = icmp ne i64 %offset, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}

define void @test_sext_offset(i64 %N) mustprogress {
; CHECK-LABEL: 'test_sext_offset'
; CHECK-NEXT:  Determining loop execution counts for: @test_sext_offset
; CHECK-NEXT:  Loop %for.body: Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable max backedge-taken count.
; CHECK-NEXT:  Loop %for.body: Unpredictable predicated backedge-taken count.
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %iv.next = add i32 %iv, 2
  %sext = sext i32 %iv to i64
  %offset = add i64 %sext, 21
  %cmp = icmp ne i64 %offset, %N
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:
  ret void
}