llvm/test/Analysis/DependenceAnalysis/gcd-miv-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>" -da-enable-dependence-test=default 2>&1 \
; RUN:     | FileCheck %s --check-prefixes=CHECK,CHECK-DEFAULT
; RUN: opt < %s -disable-output "-passes=print<da>" -da-enable-dependence-test=gcd-miv 2>&1 \
; RUN:     | FileCheck %s --check-prefixes=CHECK,CHECK-GCD-MIV

; a = 6148914691236517210; // 6148914691236517210 = ((2^64) - 1) / 3 + 5
; for (i = 0; i < 10; i++)
;   for (j = 0; j < 10; j++) {
;     if (0 <=s a*i)
;       A[a*i + 5*j] = 0;
;     A[5*i - 15*j + 14] = 1;
;   }
;
; The dependency exists between the two stores, for example,
;
;  memory access        | (i,j) == (0,0) | (i,j) == (3,0) | (i,j) == (3,1) | (i,j) == (7,2)
; ----------------------|----------------|----------------|----------------|----------------
;  A[a*i + 5*j]         |                | A[14]          | A[19]          |
;  A[5*i - 15*j + 14]   | A[14]          |                | A[14]          | A[19]
;
define void @gcd_miv_no_nsw(ptr %A) {
; CHECK-LABEL: 'gcd_miv_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 %for.i.header

for.i.header:
  %i = phi i64 [ 0, %entry ], [ %i.inc, %for.i.latch ]
  %offset.i.0 = phi i64 [ 0, %entry ], [ %offset.i.0.next, %for.i.latch ]
  %offset.i.1 = phi i64 [ 14, %entry ], [ %offset.i.1.next, %for.i.latch ]
  br label %for.j.header

for.j.header:
  %j = phi i64 [ 0, %for.i.header ], [ %j.inc, %for.j.latch ]
  %j.5 = mul i64 %j, 5
  %j.m15 = mul i64 %j, -15
  %offset.0 = add i64 %offset.i.0, %j.5
  %offset.1 = add i64 %offset.i.1, %j.m15
  %cond = icmp sge i64 %offset.i.0, 0
  br i1 %cond, label %if.then, label %for.j.latch

if.then:
  %gep.0 = getelementptr i8, ptr %A, i64 %offset.0
  store i8 0, ptr %gep.0
  br label %for.j.latch

for.j.latch:
  %gep.1 = getelementptr i8, ptr %A, i64 %offset.1
  store i8 1, ptr %gep.1
  %j.inc = add i64 %j, 1
  %ec.j = icmp eq i64 %j.inc, 10
  br i1 %ec.j, label %for.i.latch, label %for.j.header

for.i.latch:
  %i.inc = add i64 %i, 1
  %offset.i.0.next = add i64 %offset.i.0, 6148914691236517210
  %offset.i.1.next = add i64 %offset.i.1, 5
  %ec.i = icmp eq i64 %i.inc, 10
  br i1 %ec.i, label %exit, label %for.i.header

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