derek.holloway
7502bf64a4
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79 lines
2.3 KiB
LLVM
79 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 6
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; RUN: opt < %s -disable-output "-passes=print<da>" 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-ALL
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;
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; for (i = 0; i < 2; i++) {
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; A[-2] = 0;
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; for (j = 0; j < 2; j++) {
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; if (i == j)
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; A[INT64_MAX*i + INT64_MAX*j] = 1;
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; }
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; }
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;
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; There is a dependency between the two stores.
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;
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; memory access | (i, j) == (1, 1)
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; ------------------------------|------------------
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; A[-2] | A[-2]
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; A[INT64_MAX*i + INT64_MAX*j] | A[-2]
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;
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; Previously, this dependency was missed because RDIV performs "minor algebra"
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; and transforms the subscripts as follows:
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;
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; A[-2] and A[INT64_MAX*i + INT64_MAX*j]
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;
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; | minor algebra
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; v
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;
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; A[-INT64_MAX*j - 2] and A[INT64_MAX*i]
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;
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; This is unsound.
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;
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define void @f(ptr %A) {
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; CHECK-LABEL: 'f'
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; CHECK-NEXT: Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 0, ptr %gep.0, align 1
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; CHECK-NEXT: da analyze - output [S]!
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; CHECK-NEXT: Src: store i8 0, ptr %gep.0, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
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; CHECK-NEXT: da analyze - output [*|<]!
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; CHECK-NEXT: Src: store i8 1, ptr %gep.1, align 1 --> Dst: store i8 1, ptr %gep.1, align 1
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; CHECK-NEXT: da analyze - output [* *]!
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;
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entry:
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br label %loop.i.header
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loop.i.header:
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%i = phi i64 [ 0, %entry ], [ %i.inc, %loop.i.latch ]
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%i.mul = mul i64 %i, 9223372036854775807
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%gep.0 = getelementptr i8, ptr %A, i64 -2
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store i8 0, ptr %gep.0
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br label %loop.j.header
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loop.j.header:
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%j = phi i64 [ 0, %loop.i.header ], [ %j.inc, %loop.j.latch ]
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%j.mul = mul i64 %j, 9223372036854775807
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%offset.tmp = add i64 %i.mul, %j.mul
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%offset = add i64 %offset.tmp, -2
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%cond = icmp eq i64 %i, %j
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br i1 %cond, label %if.then, label %loop.j.latch
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if.then:
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%gep.1 = getelementptr i8, ptr %A, i64 %offset
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store i8 1, ptr %gep.1
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br label %loop.j.latch
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loop.j.latch:
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%j.inc = add i64 %j, 1
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%ec.j = icmp eq i64 %j.inc, 2
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br i1 %ec.j, label %loop.i.latch, label %loop.j.header
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loop.i.latch:
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%i.inc = add i64 %i, 1
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%ec.i = icmp eq i64 %i.inc, 2
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br i1 %ec.i, label %exit, label %loop.i.header
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exit:
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ret void
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}
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;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
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; CHECK-ALL: {{.*}}
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