llvm/test/Analysis/LoopAccessAnalysis/no-dep-via-loop-guards.ll

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 5
; RUN: opt -passes='print<access-info>' -disable-output < %s  2>&1 | FileCheck %s

; Loop guard for %off guarantees the accesses in the loop do not overlap.
define void @access_after_via_loop_guard(ptr %a, i64 %off) {
; CHECK-LABEL: 'access_after_via_loop_guard'
; CHECK-NEXT:    loop:
; CHECK-NEXT:      Memory dependences are safe
; CHECK-NEXT:      Dependences:
; 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:
;
  %c = icmp eq i64 %off, 100
  br i1 %c, label %ph, label %exit

ph:
  %gep.after = getelementptr inbounds nuw i32, ptr %a, i64 %off
  br label %loop

loop:
  %iv = phi i64 [ 0, %ph ], [ %iv.next, %loop ]
  %l = load i32 , ptr %gep.after, align 4
  %add = add i32 %l, %l
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  store i32 %add, ptr %gep, align 4
  %iv.next = add nsw nuw i64 %iv, 1
  %ec = icmp eq i64 %iv.next, 100
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

; Loop guard for %off guarantees the accesses in the loop do not overlap.
; TODO: currently missed by LAA
define void @access_after_via_loop_guard_sge(ptr %a, i64 %off) {
; CHECK-LABEL: 'access_after_via_loop_guard_sge'
; 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:            %l = load i32, ptr %gep.after, align 4 ->
; CHECK-NEXT:            store i32 %add, ptr %gep, 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:
;
  %c = icmp sge i64 %off, 100
  br i1 %c, label %ph, label %exit

ph:
  %gep.after = getelementptr inbounds nuw i32, ptr %a, i64 %off
  br label %loop

loop:
  %iv = phi i64 [ 0, %ph ], [ %iv.next, %loop ]
  %l = load i32 , ptr %gep.after, align 4
  %add = add i32 %l, %l
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  store i32 %add, ptr %gep, align 4
  %iv.next = add nsw nuw i64 %iv, 1
  %ec = icmp eq i64 %iv.next, 100
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

define void @access_after_via_loop_guard_99(ptr %a, i64 %off) {
; CHECK-LABEL: 'access_after_via_loop_guard_99'
; 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:            %l = load i32, ptr %gep.after, align 4 ->
; CHECK-NEXT:            store i32 %add, ptr %gep, 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:
;
  %c = icmp eq i64 %off, 99
  br i1 %c, label %ph, label %exit

ph:
  %gep.after = getelementptr inbounds nuw i32, ptr %a, i64 %off
  br label %loop

loop:
  %iv = phi i64 [ 0, %ph ], [ %iv.next, %loop ]
  %l = load i32 , ptr %gep.after, align 4
  %add = add i32 %l, %l
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  store i32 %add, ptr %gep, align 4
  %iv.next = add nsw nuw i64 %iv, 1
  %ec = icmp eq i64 %iv.next, 100
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

; Loop guard for %off guarantees the accesses in the loop do not overlap.
; TODO: currently missed by LAA
define void @access_after_via_loop_guard_sge_99(ptr %a, i64 %off) {
; CHECK-LABEL: 'access_after_via_loop_guard_sge_99'
; 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:            %l = load i32, ptr %gep.after, align 4 ->
; CHECK-NEXT:            store i32 %add, ptr %gep, 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:
;
  %c = icmp sge i64 %off, 99
  br i1 %c, label %ph, label %exit

ph:
  %gep.after = getelementptr inbounds nuw i32, ptr %a, i64 %off
  br label %loop

loop:
  %iv = phi i64 [ 0, %ph ], [ %iv.next, %loop ]
  %l = load i32 , ptr %gep.after, align 4
  %add = add i32 %l, %l
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  store i32 %add, ptr %gep, align 4
  %iv.next = add nsw nuw i64 %iv, 1
  %ec = icmp eq i64 %iv.next, 100
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

define void @access_after_via_loop_guard_uge(ptr %a, i64 %off) {
; CHECK-LABEL: 'access_after_via_loop_guard_uge'
; 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:            %l = load i32, ptr %gep.after, align 4 ->
; CHECK-NEXT:            store i32 %add, ptr %gep, 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:
;
  %c = icmp uge i64 %off, 100
  br i1 %c, label %ph, label %exit

ph:
  %gep.after = getelementptr inbounds nuw i32, ptr %a, i64 %off
  br label %loop

loop:
  %iv = phi i64 [ 0, %ph ], [ %iv.next, %loop ]
  %l = load i32 , ptr %gep.after, align 4
  %add = add i32 %l, %l
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  store i32 %add, ptr %gep, align 4
  %iv.next = add nsw nuw i64 %iv, 1
  %ec = icmp eq i64 %iv.next, 100
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

; Loop guard for %off guarantees the accesses in the loop do not overlap.
define void @access_after_via_loop_guard_eq_loop_cond(ptr %a, i64 %off) {
; CHECK-LABEL: 'access_after_via_loop_guard_eq_loop_cond'
; CHECK-NEXT:    loop:
; CHECK-NEXT:      Memory dependences are safe
; CHECK-NEXT:      Dependences:
; 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:
;
  %c = icmp eq i64 %off, 100
  br i1 %c, label %ph, label %exit

ph:
  %gep.after = getelementptr inbounds nuw i32, ptr %a, i64 100
  br label %loop

loop:
  %iv = phi i64 [ 0, %ph ], [ %iv.next, %loop ]
  %l = load i32 , ptr %gep.after, align 4
  %add = add i32 %l, %l
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  store i32 %add, ptr %gep, align 4
  %iv.next = add nsw nuw i64 %iv, 1
  %ec = icmp eq i64 %iv.next, %off
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

define void @access_after_via_loop_guard_eq_loop_cond_100(ptr %a, i64 %off) {
; CHECK-LABEL: 'access_after_via_loop_guard_eq_loop_cond_100'
; 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:            %l = load i32, ptr %gep.after, align 4 ->
; CHECK-NEXT:            store i32 %add, ptr %gep, 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:
;
  %c = icmp eq i64 %off, 101
  br i1 %c, label %ph, label %exit

ph:
  %gep.after = getelementptr inbounds nuw i32, ptr %a, i64 100
  br label %loop

loop:
  %iv = phi i64 [ 0, %ph ], [ %iv.next, %loop ]
  %l = load i32 , ptr %gep.after, align 4
  %add = add i32 %l, %l
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  store i32 %add, ptr %gep, align 4
  %iv.next = add nsw nuw i64 %iv, 1
  %ec = icmp eq i64 %iv.next, %off
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

; Loop guard for %off guarantees the accesses in the loop do not overlap.
; TODO: currently missed by LAA
define void @access_after_via_loop_guard_sge_loop_cond(ptr %a, i64 %off) {
; CHECK-LABEL: 'access_after_via_loop_guard_sge_loop_cond'
; 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:            %l = load i32, ptr %gep.after, align 4 ->
; CHECK-NEXT:            store i32 %add, ptr %gep, 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:
;
  %c = icmp sge i64 %off, 100
  br i1 %c, label %ph, label %exit

ph:
  %gep.after = getelementptr inbounds nuw i32, ptr %a, i64 100
  br label %loop

loop:
  %iv = phi i64 [ 0, %ph ], [ %iv.next, %loop ]
  %l = load i32 , ptr %gep.after, align 4
  %add = add i32 %l, %l
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  store i32 %add, ptr %gep, align 4
  %iv.next = add nsw nuw i64 %iv, 1
  %ec = icmp eq i64 %iv.next, %off
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

define void @access_after_via_loop_guard_sge_loop_cond_101(ptr %a, i64 %off) {
; CHECK-LABEL: 'access_after_via_loop_guard_sge_loop_cond_101'
; 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:            %l = load i32, ptr %gep.after, align 4 ->
; CHECK-NEXT:            store i32 %add, ptr %gep, 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:
;
  %c = icmp sge i64 %off, 101
  br i1 %c, label %ph, label %exit

ph:
  %gep.after = getelementptr inbounds nuw i32, ptr %a, i64 100
  br label %loop

loop:
  %iv = phi i64 [ 0, %ph ], [ %iv.next, %loop ]
  %l = load i32 , ptr %gep.after, align 4
  %add = add i32 %l, %l
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  store i32 %add, ptr %gep, align 4
  %iv.next = add nsw nuw i64 %iv, 1
  %ec = icmp eq i64 %iv.next, %off
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

; TODO Should be able to determine no-dep, same as @nodep_via_logical_and_2.
define void @nodep_via_logical_and_1(ptr %A, i32 %index, i32 %n) {
; CHECK-LABEL: 'nodep_via_logical_and_1'
; 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:            %0 = load double, ptr %gep.load, align 8 ->
; CHECK-NEXT:            store double %0, ptr %gep.store, align 8
; 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:
  %pre.0 = icmp sgt i32 %index, 0
  %pre.1 = icmp slt i32 %index, %n
  %and.pre = select i1 %pre.1, i1 %pre.0, i1 false
  br i1 %and.pre, label %ph, label %exit

ph:
  %idx.1 = add i32 %index, 1
  %start = zext i32 %idx.1 to i64
  br label %loop

loop:
  %iv = phi i64 [ %start, %ph ], [ %iv.next, %loop ]
  %gep.load = getelementptr double, ptr %A, i64 %iv
  %1 = load double, ptr %gep.load, align 8
  %index.ext = zext i32 %index to i64
  %gep.store = getelementptr double, ptr %A, i64 %index.ext
  store double %1, ptr %gep.store, align 8
  %iv.next = add i64 %iv, 1
  %t = trunc i64 %iv to i32
  %ec = icmp slt i32 %t, 1
  br i1 %ec, label %loop, label %exit

exit:
  ret void
}

; Same as nodep_via_logical_and_1 but with different operand order of the logical and.
define void @nodep_via_logical_and_2(ptr %A, i32 %index, i32 %n) {
; CHECK-LABEL: 'nodep_via_logical_and_2'
; CHECK-NEXT:    loop:
; CHECK-NEXT:      Memory dependences are safe
; CHECK-NEXT:      Dependences:
; 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:
  %pre.0 = icmp sgt i32 %index, 0
  %pre.1 = icmp slt i32 %index, %n
  %and.pre = select i1 %pre.0, i1 %pre.1, i1 false
  br i1 %and.pre, label %ph, label %exit

ph:
  %idx.1 = add i32 %index, 1
  %start = zext i32 %idx.1 to i64
  br label %loop

loop:
  %iv = phi i64 [ %start, %ph ], [ %iv.next, %loop ]
  %gep.load = getelementptr double, ptr %A, i64 %iv
  %1 = load double, ptr %gep.load, align 8
  %index.ext = zext i32 %index to i64
  %gep.store = getelementptr double, ptr %A, i64 %index.ext
  store double %1, ptr %gep.store, align 8
  %iv.next = add i64 %iv, 1
  %t = trunc i64 %iv to i32
  %ec = icmp slt i32 %t, 1
  br i1 %ec, label %loop, label %exit

exit:
  ret void
}