llvm/test/Analysis/LoopAccessAnalysis/wide-pointer-index-distance.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 = "e-p:128:128:128-i64:64-i128:128-n8:16:32:64-S128"

; Constant distance whose byte value needs more than 64 bits.
define void @i128_const_dist(ptr %A, i128 %n) {
; CHECK-LABEL: 'i128_const_dist'
; CHECK-NEXT:    loop:
; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
; CHECK-NEXT:  Unknown data dependence.
; CHECK-NEXT:      Dependences:
; CHECK-NEXT:        Unknown:
; CHECK-NEXT:            %v = load i32, ptr %gep.load, align 4 ->
; CHECK-NEXT:            store i32 %v, ptr %gep.store, align 4
; CHECK-EMPTY:
; CHECK-NEXT:      Run-time memory checks:
; CHECK-NEXT:      Grouped accesses:
; 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 i128 [ 0, %entry ], [ %iv.next, %loop ]
  %gep.load = getelementptr inbounds i32, ptr %A, i128 %iv
  %v = load i32, ptr %gep.load, align 4
  ; Offset whose byte distance needs > 64 bits (~2^66 elements).
  %idx.store = add i128 %iv, 73786976294838206464
  %gep.store = getelementptr inbounds i32, ptr %A, i128 %idx.store
  store i32 %v, ptr %gep.store, align 4
  %iv.next = add i128 %iv, 1
  %ec = icmp eq i128 %iv.next, %n
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

; Non-constant distance with a 128-bit type.
define void @i128_nonconst_dist(ptr %A, i128 %n, i128 %offset) {
; CHECK-LABEL: 'i128_nonconst_dist'
; 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:          %gep.store = getelementptr inbounds i32, ptr %A, i128 %idx.store
; CHECK-NEXT:        Against group GRP1:
; CHECK-NEXT:          %gep.load = getelementptr inbounds i32, ptr %A, i128 %iv
; CHECK-NEXT:      Grouped accesses:
; CHECK-NEXT:        Group GRP0:
; CHECK-NEXT:          (Low: ((4 * %offset) + %A) High: ((4 * %n) + (4 * %offset) + %A))
; CHECK-NEXT:            Member: {((4 * %offset) + %A),+,4}<%loop>
; CHECK-NEXT:        Group GRP1:
; CHECK-NEXT:          (Low: %A High: ((4 * %n) + %A))
; CHECK-NEXT:            Member: {%A,+,4}<%loop>
; 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 i128 [ 0, %entry ], [ %iv.next, %loop ]
  %idx.store = add i128 %iv, %offset
  %gep.load = getelementptr inbounds i32, ptr %A, i128 %iv
  %v = load i32, ptr %gep.load, align 4
  %gep.store = getelementptr inbounds i32, ptr %A, i128 %idx.store
  store i32 %v, ptr %gep.store, align 4
  %iv.next = add i128 %iv, 1
  %ec = icmp eq i128 %iv.next, %n
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}