llvm/test/Analysis/LoopAccessAnalysis/loop-invariant-dep-with-backedge-taken-count.ll

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 3
; RUN: opt -passes='print<access-info>' -disable-output %s 2>&1 | FileCheck %s

; Test cases for using the backedge-taken-count to rule out dependencies between
; an invariant and strided accesses.

define void @test_distance_greater_than_BTC_100(ptr %a) {
; CHECK-LABEL: 'test_distance_greater_than_BTC_100'
; 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:
  %gep.x = getelementptr i32, ptr %a, i32 100
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %gep = getelementptr i32, ptr %a, i32 %iv
  %l = load i32, ptr %gep.x
  store i32 %l, ptr %gep
  %iv.next = add i32 %iv, 1
  %ec = icmp eq i32 %iv.next, 100
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

define void @test_distance_much_greater_than_BTC_100(ptr %a) {
; CHECK-LABEL: 'test_distance_much_greater_than_BTC_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.x, align 4 ->
; CHECK-NEXT:            store i32 %l, 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:
;
entry:
  %gep.x = getelementptr i32, ptr %a, i32 200
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %gep = getelementptr i32, ptr %a, i32 %iv
  %l = load i32, ptr %gep.x
  store i32 %l, ptr %gep
  %iv.next = add i32 %iv, 1
  %ec = icmp eq i32 %iv.next, 100
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

define void @test_distance_equal_BTC_100(ptr %a) {
; CHECK-LABEL: 'test_distance_equal_BTC_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.x, align 4 ->
; CHECK-NEXT:            store i32 %l, 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:
;
entry:
  %gep.x = getelementptr i32, ptr %a, i32 99
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %gep = getelementptr i32, ptr %a, i32 %iv
  %l = load i32, ptr %gep.x
  store i32 %l, ptr %gep
  %iv.next = add i32 %iv, 1
  %ec = icmp eq i32 %iv.next, 100
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

define void @test_distance_greater_than_BTC_10000(ptr %a) {
; CHECK-LABEL: 'test_distance_greater_than_BTC_10000'
; 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:
  %gep.x = getelementptr i32, ptr %a, i32 10000
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %gep = getelementptr i32, ptr %a, i32 %iv
  %l = load i32, ptr %gep.x
  store i32 %l, ptr %gep
  %iv.next = add i32 %iv, 1
  %ec = icmp eq i32 %iv.next, 10000
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

define void @test_distance_equal_to_BTC_10000(ptr %a) {
; CHECK-LABEL: 'test_distance_equal_to_BTC_10000'
; 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.x, align 4 ->
; CHECK-NEXT:            store i32 %l, 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:
;
entry:
  %gep.x = getelementptr i32, ptr %a, i32 9999
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %gep = getelementptr i32, ptr %a, i32 %iv
  %l = load i32, ptr %gep.x
  store i32 %l, ptr %gep
  %iv.next = add i32 %iv, 1
  %ec = icmp eq i32 %iv.next, 100000
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

define void @test_btc_is_unknown_value(ptr %a, i32 %N) {
; CHECK-LABEL: 'test_btc_is_unknown_value'
; 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.x, align 4 ->
; CHECK-NEXT:            store i32 %l, ptr %gep, align 4
; CHECK-EMPTY:
; CHECK-NEXT:      Run-time memory checks:
; CHECK-NEXT:      Grouped accesses:
; CHECK-NEXT:        Group GRP0:
; CHECK-NEXT:          (Low: (400 + %a) High: (404 + %a))
; CHECK-NEXT:            Member: (400 + %a)
; CHECK-NEXT:        Group GRP1:
; CHECK-NEXT:          (Low: %a High: (4 + (4 * (zext i32 (-1 + %N) to i64))<nuw><nsw> + %a))
; CHECK-NEXT:            Member: {%a,+,4}<nw><%loop>
; CHECK-EMPTY:
; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
; CHECK-NEXT:      SCEV assumptions:
; CHECK-NEXT:      {0,+,1}<nuw><%loop> Added Flags: <nssw>
; CHECK-EMPTY:
; CHECK-NEXT:      Expressions re-written:
; CHECK-NEXT:      [PSE] %gep = getelementptr i32, ptr %a, i32 %iv:
; CHECK-NEXT:        ((4 * (sext i32 {0,+,1}<nuw><%loop> to i64))<nsw> + %a)
; CHECK-NEXT:        --> {%a,+,4}<nw><%loop>
;
entry:
  %gep.x = getelementptr i32, ptr %a, i32 100
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %gep = getelementptr i32, ptr %a, i32 %iv
  %l = load i32, ptr %gep.x
  store i32 %l, ptr %gep
  %iv.next = add i32 %iv, 1
  %ec = icmp eq i32 %iv.next, %N
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}