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[DA] Add tests for nsw doesn't hold on entier iteration #162281

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[DA] Add tests for nsw doesn't hold on entier iteration #162281

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142 changes: 142 additions & 0 deletions llvm/test/Analysis/DependenceAnalysis/monotonicity-loop-guard.ll
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Original file line number Diff line number Diff line change
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; 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-dump-monotonicity-report \
; RUN: -da-enable-monotonicity-check 2>&1 | FileCheck %s

; for (i = 0; i < 9223372036854775806; i++)
; if (i < 2147483640)
; for (j = 0; j < 2147483640; j++)
; a[i + j * 4294967296] = 0;
;
; FIXME: This is not monotonic. The nsw flag is valid under
; the condition i < 2147483640, not for all i.
define void @nsw_under_loop_guard0(ptr %a) {
; CHECK-LABEL: 'nsw_under_loop_guard0'
; CHECK-NEXT: Monotonicity check:
; CHECK-NEXT: Inst: store i8 0, ptr %idx, align 1
; CHECK-NEXT: Expr: {{\{\{}}0,+,1}<nuw><nsw><%loop.i.header>,+,4294967296}<nuw><nsw><%loop.j>
; CHECK-NEXT: Monotonicity: MultiSignedMonotonic
; CHECK-EMPTY:
; CHECK-NEXT: Src: store i8 0, ptr %idx, align 1 --> Dst: store i8 0, ptr %idx, align 1
; CHECK-NEXT: da analyze - none!
;
entry:
br label %loop.i.header

loop.i.header:
%i = phi i64 [ 0 , %entry ], [ %i.next, %loop.i.latch ]
br label %loop.j.pr

loop.j.pr:
%guard.j = icmp slt i64 %i, 2147483640
br i1 %guard.j, label %loop.j, label %exit

loop.j:
%j = phi i64 [ 0, %loop.j.pr ], [ %j.next, %loop.j ]
%val = phi i64 [ %i, %loop.j.pr ], [ %val.next, %loop.j ]
%j.next = add nsw i64 %j, 1
%idx = getelementptr inbounds i8, ptr %a, i64 %val
store i8 0, ptr %idx
%val.next = add nsw i64 %val, 4294967296
%exitcond.j = icmp eq i64 %j.next, 2147483640
br i1 %exitcond.j, label %loop.i.latch, label %loop.j

loop.i.latch:
%i.next = add nsw i64 %i, 1
%exitcond.i = icmp eq i64 %i.next, 9223372036854775806
br i1 %exitcond.i, label %exit, label %loop.i.header

exit:
ret void
}

; for (i = 0; i < 100; i++)
; if (i < 1000)
; for (j = 0; j < 100; j++)
; a[i + j] = 0;
;
; The loop guard is always true, so the nsw flag is valid for all i.
define void @nsw_under_loop_guard1(ptr %a) {
; CHECK-LABEL: 'nsw_under_loop_guard1'
; CHECK-NEXT: Monotonicity check:
; CHECK-NEXT: Inst: store i8 0, ptr %idx, align 1
; CHECK-NEXT: Expr: {{\{\{}}0,+,1}<nuw><nsw><%loop.i.header>,+,1}<nuw><nsw><%loop.j>
; CHECK-NEXT: Monotonicity: MultiSignedMonotonic
; CHECK-EMPTY:
; CHECK-NEXT: Src: store i8 0, ptr %idx, align 1 --> Dst: store i8 0, ptr %idx, align 1
; CHECK-NEXT: da analyze - output [* *]!
;
entry:
br label %loop.i.header

loop.i.header:
%i = phi i64 [ 0 , %entry ], [ %i.next, %loop.i.latch ]
br label %loop.j.pr

loop.j.pr:
%guard.j = icmp slt i64 %i, 1000
br i1 %guard.j, label %loop.j, label %exit

loop.j:
%j = phi i64 [ 0, %loop.j.pr ], [ %j.next, %loop.j ]
%val = phi i64 [ %i, %loop.j.pr ], [ %val.next, %loop.j ]
%j.next = add nsw i64 %j, 1
%idx = getelementptr inbounds i8, ptr %a, i64 %val
store i8 0, ptr %idx
%val.next = add nsw i64 %val, 1
%exitcond.j = icmp eq i64 %j.next, 100
br i1 %exitcond.j, label %loop.i.latch, label %loop.j

loop.i.latch:
%i.next = add nsw i64 %i, 1
%exitcond.i = icmp eq i64 %i.next, 100
br i1 %exitcond.i, label %exit, label %loop.i.header

exit:
ret void
}

; for (i = 0; i < n; i++)
; if (i < m)
; for (j = 0; j < k; j++)
; a[i + j] = 0;
;
; The nsw flag may valid under the condition i < k.
define void @nsw_under_loop_guard2(ptr %a, i64 %n, i64 %m, i64 %k) {
; CHECK-LABEL: 'nsw_under_loop_guard2'
; CHECK-NEXT: Monotonicity check:
; CHECK-NEXT: Inst: store i8 0, ptr %idx, align 1
; CHECK-NEXT: Expr: {{\{\{}}0,+,1}<nuw><nsw><%loop.i.header>,+,1}<nuw><nsw><%loop.j>
; CHECK-NEXT: Monotonicity: MultiSignedMonotonic
; CHECK-EMPTY:
; CHECK-NEXT: Src: store i8 0, ptr %idx, align 1 --> Dst: store i8 0, ptr %idx, align 1
; CHECK-NEXT: da analyze - output [* *]!
;
entry:
br label %loop.i.header

loop.i.header:
%i = phi i64 [ 0 , %entry ], [ %i.next, %loop.i.latch ]
br label %loop.j.pr

loop.j.pr:
%guard.j = icmp slt i64 %i, %m
br i1 %guard.j, label %loop.j, label %exit

loop.j:
%j = phi i64 [ 0, %loop.j.pr ], [ %j.next, %loop.j ]
%val = phi i64 [ %i, %loop.j.pr ], [ %val.next, %loop.j ]
%j.next = add nsw i64 %j, 1
%idx = getelementptr inbounds i8, ptr %a, i64 %val
store i8 0, ptr %idx
%val.next = add nsw i64 %val, 1
%exitcond.j = icmp eq i64 %j.next, %k
br i1 %exitcond.j, label %loop.i.latch, label %loop.j

loop.i.latch:
%i.next = add nsw i64 %i, 1
%exitcond.i = icmp eq i64 %i.next, %n
br i1 %exitcond.i, label %exit, label %loop.i.header

exit:
ret void
}
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