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llvm-project/llvm/test/Analysis/LoopAccessAnalysis/no-dep-via-loop-guards.ll
Florian Hahn dec4cfdb09
[LAA] Use loop guards when checking invariant accesses. 
Apply loop guards to start and end pointers like done in other places to
improve results.
2024-10-04 12:23:13 +01:00

352 lines
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LLVM
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; 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
}
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