| 1 | // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -triple x86_64-linux-gnu %s |
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| 2 | |
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| 3 | int n; |
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| 4 | constexpr int *p = 0; |
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| 5 | // expected-error@+1 {{must be initialized by a constant expression}} |
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| 6 | constexpr int *k = (int *) __builtin_assume_aligned(p, 16, n = 5); |
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| 7 | |
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| 8 | constexpr void *l = __builtin_assume_aligned(p, 16); |
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| 9 | |
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| 10 | // expected-error@+2 {{must be initialized by a constant expression}} |
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| 11 | // expected-note@+1 {{cast from 'void *' is not allowed in a constant expression}} |
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| 12 | constexpr int *c = (int *) __builtin_assume_aligned(p, 16); |
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| 13 | |
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| 14 | // expected-error@+2 {{must be initialized by a constant expression}} |
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| 15 | // expected-note@+1 {{alignment of the base pointee object (4 bytes) is less than the asserted 16 bytes}} |
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| 16 | constexpr void *m = __builtin_assume_aligned(&n, 16); |
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| 17 | |
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| 18 | // expected-error@+2 {{must be initialized by a constant expression}} |
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| 19 | // expected-note@+1 {{offset of the aligned pointer from the base pointee object (-2 bytes) is not a multiple of the asserted 4 bytes}} |
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| 20 | constexpr void *q1 = __builtin_assume_aligned(&n, 4, 2); |
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| 21 | // expected-error@+2 {{must be initialized by a constant expression}} |
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| 22 | // expected-note@+1 {{offset of the aligned pointer from the base pointee object (2 bytes) is not a multiple of the asserted 4 bytes}} |
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| 23 | constexpr void *q2 = __builtin_assume_aligned(&n, 4, -2); |
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| 24 | constexpr void *q3 = __builtin_assume_aligned(&n, 4, 4); |
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| 25 | constexpr void *q4 = __builtin_assume_aligned(&n, 4, -4); |
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| 26 | |
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| 27 | static char ar1[6]; |
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| 28 | // expected-error@+2 {{must be initialized by a constant expression}} |
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| 29 | // expected-note@+1 {{alignment of the base pointee object (1 byte) is less than the asserted 16 bytes}} |
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| 30 | constexpr void *r1 = __builtin_assume_aligned(&ar1[2], 16); |
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| 31 | |
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| 32 | static char ar2[6] __attribute__((aligned(32))); |
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| 33 | // expected-error@+2 {{must be initialized by a constant expression}} |
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| 34 | // expected-note@+1 {{offset of the aligned pointer from the base pointee object (2 bytes) is not a multiple of the asserted 16 bytes}} |
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| 35 | constexpr void *r2 = __builtin_assume_aligned(&ar2[2], 16); |
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| 36 | constexpr void *r3 = __builtin_assume_aligned(&ar2[2], 16, 2); |
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| 37 | // expected-error@+2 {{must be initialized by a constant expression}} |
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| 38 | // expected-note@+1 {{offset of the aligned pointer from the base pointee object (1 byte) is not a multiple of the asserted 16 bytes}} |
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| 39 | constexpr void *r4 = __builtin_assume_aligned(&ar2[2], 16, 1); |
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| 40 | |
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| 41 | constexpr int* x = __builtin_constant_p((int*)0xFF) ? (int*)0xFF : (int*)0xFF; |
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| 42 | // expected-error@+2 {{must be initialized by a constant expression}} |
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| 43 | // expected-note@+1 {{value of the aligned pointer (255) is not a multiple of the asserted 32 bytes}} |
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| 44 | constexpr void *s1 = __builtin_assume_aligned(x, 32); |
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| 45 | // expected-error@+2 {{must be initialized by a constant expression}} |
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| 46 | // expected-note@+1 {{value of the aligned pointer (250) is not a multiple of the asserted 32 bytes}} |
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| 47 | constexpr void *s2 = __builtin_assume_aligned(x, 32, 5); |
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| 48 | constexpr void *s3 = __builtin_assume_aligned(x, 32, -1); |
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| 49 | |
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| 50 | |
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