derek.holloway
7502bf64a4
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63 lines
3.2 KiB
C++
63 lines
3.2 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -triple x86_64-linux-gnu %s
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int n;
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constexpr int *p = 0;
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// expected-error@+1 {{must be initialized by a constant expression}}
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constexpr int *k = (int *) __builtin_assume_aligned(p, 16, n = 5);
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constexpr void *l = __builtin_assume_aligned(p, 16);
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// expected-error@+2 {{must be initialized by a constant expression}}
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// expected-note@+1 {{cast from 'void *' is not allowed in a constant expression}}
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constexpr int *c = (int *) __builtin_assume_aligned(p, 16);
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// expected-error@+2 {{must be initialized by a constant expression}}
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// expected-note@+1 {{alignment of the base pointee object (4 bytes) is less than the asserted 16 bytes}}
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constexpr void *m = __builtin_assume_aligned(&n, 16);
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// expected-error@+2 {{must be initialized by a constant expression}}
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// 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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constexpr void *q1 = __builtin_assume_aligned(&n, 4, 2);
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// expected-error@+2 {{must be initialized by a constant expression}}
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// 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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constexpr void *q2 = __builtin_assume_aligned(&n, 4, -2);
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constexpr void *q3 = __builtin_assume_aligned(&n, 4, 4);
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constexpr void *q4 = __builtin_assume_aligned(&n, 4, -4);
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static char ar1[6];
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// expected-error@+2 {{must be initialized by a constant expression}}
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// expected-note@+1 {{alignment of the base pointee object (1 byte) is less than the asserted 16 bytes}}
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constexpr void *r1 = __builtin_assume_aligned(&ar1[2], 16);
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static char ar2[6] __attribute__((aligned(32)));
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// expected-error@+2 {{must be initialized by a constant expression}}
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// 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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constexpr void *r2 = __builtin_assume_aligned(&ar2[2], 16);
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constexpr void *r3 = __builtin_assume_aligned(&ar2[2], 16, 2);
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// expected-error@+2 {{must be initialized by a constant expression}}
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// 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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constexpr void *r4 = __builtin_assume_aligned(&ar2[2], 16, 1);
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constexpr int* x = __builtin_constant_p((int*)0xFF) ? (int*)0xFF : (int*)0xFF;
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// expected-error@+2 {{must be initialized by a constant expression}}
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// expected-note@+1 {{value of the aligned pointer (255) is not a multiple of the asserted 32 bytes}}
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constexpr void *s1 = __builtin_assume_aligned(x, 32);
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// expected-error@+2 {{must be initialized by a constant expression}}
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// expected-note@+1 {{value of the aligned pointer (250) is not a multiple of the asserted 32 bytes}}
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constexpr void *s2 = __builtin_assume_aligned(x, 32, 5);
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constexpr void *s3 = __builtin_assume_aligned(x, 32, -1);
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constexpr int add(int a, int b) {
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return a+b;
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}
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constexpr void *c1 = __builtin_assume_aligned(p, add(1,1));
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constexpr void *c2 = __builtin_assume_aligned(p, add(2,1)); // expected-error {{not a power of 2}}
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constexpr long kAlignment = 128;
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long AllocateAlignedBytes_payload;
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void AllocateAlignedBytes() {
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void *m = __builtin_assume_aligned(
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reinterpret_cast<void *>(AllocateAlignedBytes_payload), kAlignment);
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}
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