[llvm-branch-commits] [llvm] [DA] Add tests for the Weak Zero SIV tests miss dependency (NFC) (PR #184998)

[Ryotaro Kasuga via llvm-branch-commits]

https://github.com/kasuga-fj created https://github.com/llvm/llvm-project/pull/184998

None

>From a4f79648851feef569775fc6259c14758f75fd41 Mon Sep 17 00:00:00 2001
From: Ryotaro Kasuga <kasuga.ryotaro at fujitsu.com>
Date: Fri, 6 Mar 2026 11:56:50 +0000
Subject: [PATCH] [DA] Add tests for the Weak Zero SIV tests miss dependency
 (NFC)

---
 .../weak-zero-siv-delta-signed-min.ll         | 111 ++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 llvm/test/Analysis/DependenceAnalysis/weak-zero-siv-delta-signed-min.ll

diff --git a/llvm/test/Analysis/DependenceAnalysis/weak-zero-siv-delta-signed-min.ll b/llvm/test/Analysis/DependenceAnalysis/weak-zero-siv-delta-signed-min.ll
new file mode 100644
index 0000000000000..b005b9bdf46a7
--- /dev/null
+++ b/llvm/test/Analysis/DependenceAnalysis/weak-zero-siv-delta-signed-min.ll
@@ -0,0 +1,111 @@
+; 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-zero-siv 2>&1 \
+; RUN:     | FileCheck %s --check-prefixes=CHECK,CHECK-WEAK-ZERO-SRC-SIV
+
+;
+; for (i = 0; i < (1 << 63) + 10; i++) {
+;   A[-(1 << 62)] = 0;
+;   if ((1 << 63) <= i)
+;     A[-i + (1 << 62)] = 1;
+; }
+;
+; FIXME: There is a dependency between the two stores in all directions.
+;
+define void @weak_zero_src_siv_large_btc(ptr %A) {
+; CHECK-ALL-LABEL: 'weak_zero_src_siv_large_btc'
+; 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 [S]!
+; 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 - none!
+; 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 - none!
+;
+; CHECK-WEAK-ZERO-SRC-SIV-LABEL: 'weak_zero_src_siv_large_btc'
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:  Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 0, ptr %gep.0, align 1
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:    da analyze - output [S]!
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:  Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:    da analyze - none!
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:  Src: store i8 1, ptr %gep.1, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:    da analyze - output [*]!
+;
+entry:
+  br label %loop.header
+
+loop.header:
+  %i = phi i64 [ 0, %entry ], [ %i.inc, %loop.latch ]
+  %offset = phi i64 [ 4611686018427387904, %entry ], [ %offset.next, %loop.latch ]
+  %gep.0 = getelementptr i8, ptr %A, i64 -4611686018427387904
+  store i8 0, ptr %gep.0
+  %cond = icmp uge i64 %i, 9223372036854775808
+  br i1 %cond, label %if.then, label %loop.latch
+
+if.then:
+  %gep.1 = getelementptr i8, ptr %A, i64 %offset
+  store i8 1, ptr %gep.1
+  br label %loop.latch
+
+loop.latch:
+  %i.inc = add i64 %i, 1
+  %offset.next = add i64 %offset, -1
+  %ec = icmp eq i64 %i.inc, 9223372036854775818
+  br i1 %ec, label %exit, label %loop.header
+
+exit:
+  ret void
+}
+
+;
+; for (i = 0; i < (1 << 63) + 10; i++) {
+;   if ((1 << 63) <= i)
+;     A[i - (1 << 62)] = 0;
+;   A[1 << 62] = 1;
+; }
+;
+; FIXME: There is a dependency between the two stores in all directions.
+;
+define void @weak_zero_dst_siv_large_btc(ptr %A) {
+; CHECK-ALL-LABEL: 'weak_zero_dst_siv_large_btc'
+; 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 - none!
+; 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 - none!
+; 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 [S]!
+;
+; CHECK-WEAK-ZERO-SRC-SIV-LABEL: 'weak_zero_dst_siv_large_btc'
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:  Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 0, ptr %gep.0, align 1
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:    da analyze - output [*]!
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:  Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:    da analyze - none!
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:  Src: store i8 1, ptr %gep.1, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
+; CHECK-WEAK-ZERO-SRC-SIV-NEXT:    da analyze - output [S]!
+;
+entry:
+  br label %loop.header
+
+loop.header:
+  %i = phi i64 [ 0, %entry ], [ %i.inc, %loop.latch ]
+  %offset = phi i64 [ -4611686018427387904, %entry ], [ %offset.next, %loop.latch ]
+  %cond = icmp uge i64 %i, 9223372036854775808
+  br i1 %cond, label %if.then, label %loop.latch
+
+if.then:
+  %gep.0 = getelementptr i8, ptr %A, i64 %offset
+  store i8 0, ptr %gep.0
+  br label %loop.latch
+
+loop.latch:
+  %gep.1 = getelementptr i8, ptr %A, i64 4611686018427387904
+  store i8 1, ptr %gep.1
+  %i.inc = add i64 %i, 1
+  %offset.next = add i64 %offset, 1
+  %ec = icmp eq i64 %i.inc, 9223372036854775818
+  br i1 %ec, label %exit, label %loop.header
+
+exit:
+  ret void
+}
+;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
+; CHECK: {{.*}}