llvm/test/Analysis/LoopAccessAnalysis/all-ones-null-pointer.ll

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 6
; RUN: opt -passes='print<access-info>' -disable-output %s 2>&1 | FileCheck %s

target datalayout = "po1:64:64"

; Tests with an address space that has an all-ones nullptr.

; The step is negative and evaluating at the symbolic max BTC may wrap, so we
; need a zero pointer as lower bound.
define void @negative_step_all_ones_null(ptr addrspace(1) %P, ptr addrspace(1) %S) {
; CHECK-LABEL: 'negative_step_all_ones_null'
; CHECK-NEXT:    loop:
; CHECK-NEXT:      Memory dependences are safe with run-time checks
; CHECK-NEXT:      Dependences:
; CHECK-NEXT:      Run-time memory checks:
; CHECK-NEXT:      Check 0:
; CHECK-NEXT:        Comparing group GRP0:
; CHECK-NEXT:          %ptr.iv = phi ptr addrspace(1) [ %P, %entry ], [ %ptr.iv.next, %loop ]
; CHECK-NEXT:        Against group GRP1:
; CHECK-NEXT:        ptr addrspace(1) %S
; CHECK-NEXT:      Grouped accesses:
; CHECK-NEXT:        Group GRP0:
; CHECK-NEXT:          (Low: null High: (4 + %P))
; CHECK-NEXT:            Member: {%P,+,-4}<nw><%loop>
; CHECK-NEXT:        Group GRP1:
; CHECK-NEXT:          (Low: %S High: (4 + %S))
; CHECK-NEXT:            Member: %S
; CHECK-EMPTY:
; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
; CHECK-NEXT:      SCEV assumptions:
; CHECK-EMPTY:
; CHECK-NEXT:      Expressions re-written:
;
entry:
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %ptr.iv = phi ptr addrspace(1) [ %P, %entry ], [ %ptr.iv.next, %loop ]
  %l = load i32, ptr addrspace(1) %S
  store i32 %l, ptr addrspace(1) %ptr.iv, align 4
  %ptr.iv.next = getelementptr inbounds i8, ptr addrspace(1) %ptr.iv, i32 -4
  %iv.next = add nsw i32 %iv, 1
  %c.2 = icmp slt i32 %iv.next, %l
  br i1 %c.2, label %loop, label %exit

exit:
  ret void
}