llvm/test/Analysis/DependenceAnalysis/strong-siv-addrec-wrap.ll

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 6
; RUN: opt < %s -disable-output "-passes=print<da>" 2>&1 \
; RUN:     | FileCheck %s --check-prefixes=CHECK,CHECK-ALL
; RUN: opt < %s -disable-output "-passes=print<da>" -da-enable-dependence-test=strong-siv 2>&1 \
; RUN:     | FileCheck %s --check-prefixes=CHECK,CHECK-STRONG-SIV

; a = (1 << 62) + 1;
; for (i = 0; i < 10; i++) {
;   if (0 <=s a*i)
;     A[a*i] = 0;
;
;   if (0 <=s a*i + 4)
;     A[a*i + 4] = 1;
; }
;
; The dependency exists between the two stores, for example,
;
;  memory access     | i == 0 | i == 4
; -------------------|--------|--------
;  A[(2^62+1)*i]     |        | A[4]
;  A[(2^62+1)*i + 4] | A[4]   |
;
define void @strong_siv_no_nsw(ptr %A) {
; CHECK-LABEL: 'strong_siv_no_nsw'
; CHECK-NEXT:  Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 0, ptr %gep.0, align 1
; CHECK-NEXT:    da analyze - output [*]!
; CHECK-NEXT:  Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
; CHECK-NEXT:    da analyze - output [*|<]!
; CHECK-NEXT:  Src: store i8 1, ptr %gep.1, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
; CHECK-NEXT:    da analyze - output [*]!
;
entry:
  br label %loop.header

loop.header:
  %i = phi i64 [ 0, %entry ], [ %i.inc, %loop.latch ]
  %offset.0 = phi i64 [ 0, %entry ], [ %offset.0.next, %loop.latch ]
  %offset.1 = phi i64 [ 4, %entry ], [ %offset.1.next, %loop.latch ]
  %cond.0 = icmp sge i64 %offset.0, 0
  br i1 %cond.0, label %if.then.0, label %loop.middle

if.then.0:
  %gep.0 = getelementptr i8, ptr %A, i64 %offset.0
  store i8 0, ptr %gep.0
  br label %loop.middle

loop.middle:
  %cond.1 = icmp sge i64 %offset.1, 0
  br i1 %cond.1, label %if.then.1, label %loop.latch

if.then.1:
  %gep.1 = getelementptr i8, ptr %A, i64 %offset.1
  store i8 1, ptr %gep.1
  br label %loop.latch

loop.latch:
  %i.inc = add i64 %i, 1
  %offset.0.next = add i64 %offset.0, 4611686018427387905 ; (1LL << 62) + 1
  %offset.1.next = add i64 %offset.1, 4611686018427387905
  %ec = icmp eq i64 %i.inc, 10
  br i1 %ec, label %exit, label %loop.header

exit:
  ret void
}
;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
; CHECK-ALL: {{.*}}
; CHECK-STRONG-SIV: {{.*}}