diff options
Diffstat (limited to 'llvm/test/Analysis/DependenceAnalysis/weak-zero-siv-overflow.ll')
| -rw-r--r-- | llvm/test/Analysis/DependenceAnalysis/weak-zero-siv-overflow.ll | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/llvm/test/Analysis/DependenceAnalysis/weak-zero-siv-overflow.ll b/llvm/test/Analysis/DependenceAnalysis/weak-zero-siv-overflow.ll new file mode 100644 index 0000000..6317c38 --- /dev/null +++ b/llvm/test/Analysis/DependenceAnalysis/weak-zero-siv-overflow.ll @@ -0,0 +1,122 @@ +; 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-SIV + +; for (i = 0; i < (1LL << 62); i++) { +; if (0 <= 2*i - 2) +; A[2*i - 2] = 1; +; A[2] = 2; +; } +; +; FIXME: DependenceAnalysis currently detects no dependency between the two +; stores, but it does exist. The root cause is that the product of the BTC and +; the coefficient ((1LL << 62) - 1 and 2) overflows in a signed sense. +; +define void @weakzero_dst_siv_prod_ovfl(ptr %A) { +; CHECK-ALL-LABEL: 'weakzero_dst_siv_prod_ovfl' +; CHECK-ALL-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.0, align 1 +; CHECK-ALL-NEXT: da analyze - none! +; CHECK-ALL-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 2, ptr %gep.1, align 1 +; CHECK-ALL-NEXT: da analyze - none! +; CHECK-ALL-NEXT: Src: store i8 2, ptr %gep.1, align 1 --> Dst: store i8 2, ptr %gep.1, align 1 +; CHECK-ALL-NEXT: da analyze - consistent output [S]! +; +; CHECK-WEAK-ZERO-SIV-LABEL: 'weakzero_dst_siv_prod_ovfl' +; CHECK-WEAK-ZERO-SIV-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.0, align 1 +; CHECK-WEAK-ZERO-SIV-NEXT: da analyze - consistent output [*]! +; CHECK-WEAK-ZERO-SIV-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 2, ptr %gep.1, align 1 +; CHECK-WEAK-ZERO-SIV-NEXT: da analyze - none! +; CHECK-WEAK-ZERO-SIV-NEXT: Src: store i8 2, ptr %gep.1, align 1 --> Dst: store i8 2, ptr %gep.1, align 1 +; CHECK-WEAK-ZERO-SIV-NEXT: da analyze - consistent output [S]! +; +entry: + br label %loop.header + +loop.header: + %i = phi i64 [ 0, %entry ], [ %i.inc, %loop.latch ] + %offset = phi i64 [ -2, %entry ], [ %offset.next, %loop.latch ] + %ec = icmp eq i64 %i, 4611686018427387904 + br i1 %ec, label %exit, label %loop.body + +loop.body: + %cond = icmp sge i64 %offset, 0 + br i1 %cond, label %if.then, label %loop.latch + +if.then: + %gep.0 = getelementptr inbounds i8, ptr %A, i64 %offset + store i8 1, ptr %gep.0 + br label %loop.latch + +loop.latch: + %gep.1 = getelementptr inbounds i8, ptr %A, i64 2 + store i8 2, ptr %gep.1 + %i.inc = add nuw nsw i64 %i, 1 + %offset.next = add nsw i64 %offset, 2 + br label %loop.header + +exit: + ret void +} + +; for (i = 0; i < n; i++) { +; if (0 <= 2*i - 1) +; A[2*i - 1] = 1; +; A[INT64_MAX] = 2; +; } +; +; FIXME: DependenceAnalysis currently detects no dependency between the two +; stores, but it does exist. When `%n` is 2^62, the value of `%offset` will be +; the same as INT64_MAX at the last iteration. +; The root cause is that the calculation of the difference between the two +; constants (INT64_MAX and -1) overflows in a signed sense. +; +define void @weakzero_dst_siv_delta_ovfl(ptr %A, i64 %n) { +; CHECK-ALL-LABEL: 'weakzero_dst_siv_delta_ovfl' +; CHECK-ALL-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.0, align 1 +; CHECK-ALL-NEXT: da analyze - none! +; CHECK-ALL-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 2, ptr %gep.1, align 1 +; CHECK-ALL-NEXT: da analyze - none! +; CHECK-ALL-NEXT: Src: store i8 2, ptr %gep.1, align 1 --> Dst: store i8 2, ptr %gep.1, align 1 +; CHECK-ALL-NEXT: da analyze - consistent output [S]! +; +; CHECK-WEAK-ZERO-SIV-LABEL: 'weakzero_dst_siv_delta_ovfl' +; CHECK-WEAK-ZERO-SIV-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.0, align 1 +; CHECK-WEAK-ZERO-SIV-NEXT: da analyze - consistent output [*]! +; CHECK-WEAK-ZERO-SIV-NEXT: Src: store i8 1, ptr %gep.0, align 1 --> Dst: store i8 2, ptr %gep.1, align 1 +; CHECK-WEAK-ZERO-SIV-NEXT: da analyze - none! +; CHECK-WEAK-ZERO-SIV-NEXT: Src: store i8 2, ptr %gep.1, align 1 --> Dst: store i8 2, ptr %gep.1, align 1 +; CHECK-WEAK-ZERO-SIV-NEXT: da analyze - consistent output [S]! +; +entry: + %guard = icmp sgt i64 %n, 0 + br i1 %guard, label %loop.header, label %exit + +loop.header: + %i = phi i64 [ 0, %entry ], [ %i.inc, %loop.latch ] + %offset = phi i64 [ -2, %entry ], [ %offset.next, %loop.latch ] + %ec = icmp eq i64 %i, %n + br i1 %ec, label %exit, label %loop.body + +loop.body: + %cond = icmp sge i64 %offset, 0 + br i1 %cond, label %if.then, label %loop.latch + +if.then: + %gep.0 = getelementptr inbounds i8, ptr %A, i64 %offset + store i8 1, ptr %gep.0 + br label %loop.latch + +loop.latch: + %gep.1 = getelementptr inbounds i8, ptr %A, i64 9223372036854775807 + store i8 2, ptr %gep.1 + %i.inc = add nuw nsw i64 %i, 1 + %offset.next = add nsw i64 %offset, 2 + br label %loop.header + +exit: + ret void +} +;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line: +; CHECK: {{.*}} |