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[DA] Add a test where the Weak Crossing SIV test misses dependency (NFC) (#188183)

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The root cause is that the Weak Crossing SIV test assumes the
coefficients are non‑zero without verifying it.
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Ryotaro Kasuga 2026-03-24 16:08:15 +09:00 committed by GitHub
parent 31aa52086f
commit f7fb46701a
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llvm/test/Analysis/DependenceAnalysis/weak-crossing-siv-coeff-may-zero.ll Normal file
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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>" 2>&1 \
; RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-ALL
; RUN: opt < %s -disable-output "-passes=print<da>" -da-enable-dependence-test=weak-crossing-siv 2>&1 \
; RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-WEAK-CROSSING-SIV
; for (i = 0; i < 10; i++) {
; A[a*i] = 0;
; A[-a*i] = 1;
; }
;
; FIXME: When a == 0, there is a dependency with all directions between the two
; stores.
;
define void @weak_crossing_siv_coeff_may_zero(ptr %A, i64 %a) {
; CHECK-ALL-LABEL: 'weak_crossing_siv_coeff_may_zero'
; CHECK-ALL-NEXT: Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 0, ptr %gep.0, align 1
; CHECK-ALL-NEXT: da analyze - output [0]!
; CHECK-ALL-NEXT: Runtime Assumptions:
; CHECK-ALL-NEXT: Compare predicate: %a ne) 0
; CHECK-ALL-NEXT: Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
; CHECK-ALL-NEXT: da analyze - output [0|<]!
; CHECK-ALL-NEXT: Src: store i8 1, ptr %gep.1, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
; CHECK-ALL-NEXT: da analyze - output [0]!
; CHECK-ALL-NEXT: Runtime Assumptions:
; CHECK-ALL-NEXT: Compare predicate: (-1 * %a) ne) 0
;
; CHECK-WEAK-CROSSING-SIV-LABEL: 'weak_crossing_siv_coeff_may_zero'
; CHECK-WEAK-CROSSING-SIV-NEXT: Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 0, ptr %gep.0, align 1
; CHECK-WEAK-CROSSING-SIV-NEXT: da analyze - output [*]!
; CHECK-WEAK-CROSSING-SIV-NEXT: Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
; CHECK-WEAK-CROSSING-SIV-NEXT: da analyze - output [0|<]!
; CHECK-WEAK-CROSSING-SIV-NEXT: Src: store i8 1, ptr %gep.1, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
; CHECK-WEAK-CROSSING-SIV-NEXT: da analyze - output [*]!
;
entry:
%a.neg = sub nsw i64 0, %a
br label %loop
loop:
%i = phi i64 [ 0, %entry ], [ %i.inc, %loop ]
%offset.0 = phi i64 [ 0, %entry ], [ %offset.0.next, %loop ]
%offset.1 = phi i64 [ 0, %entry ], [ %offset.1.next, %loop ]
%gep.0 = getelementptr i8, ptr %A, i64 %offset.0
%gep.1 = getelementptr i8, ptr %A, i64 %offset.1
store i8 0, ptr %gep.0
store i8 1, ptr %gep.1
%i.inc = add i64 %i, 1
%offset.0.next = add nsw i64 %offset.0, %a
%offset.1.next = add nsw i64 %offset.1, %a.neg
%ec = icmp eq i64 %i.inc, 10
br i1 %ec, label %exit, label %loop
exit:
ret void
}
;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
; CHECK: {{.*}}