derek.holloway
7502bf64a4
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48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
// RUN: %clang_cc1 -verify %s
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/* WG14 N736: yes
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* preprocessor arithmetic done in intmax_t/uintmax_t
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*/
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// There is not a standard requirement that this relationships holds. If these
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// asserts fail, it means we have another test scenario to consider.
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_Static_assert(__INTMAX_MAX__ == __LONG_LONG_MAX__,
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"intmax_t is not the same width as long long?");
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_Static_assert((-__INTMAX_MAX__ - 1) == (-__LONG_LONG_MAX__ - 1LL),
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"intmax_t is not the same width as long long?");
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_Static_assert(__UINTMAX_MAX__ == (__LONG_LONG_MAX__ * 2ULL + 1ULL),
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"uintmax_t is not the same width as unsigned long long?");
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// Test that arithmetic on the largest positive signed intmax_t works.
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#if 9223372036854775807LL + 0LL != 9223372036854775807LL
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#error "uh oh"
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#endif
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// Same for negative.
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#if -9223372036854775807LL - 1LL + 0LL != -9223372036854775807LL - 1LL
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#error "uh oh"
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#endif
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// Then test the same for unsigned
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#if 18446744073709551615ULL + 0ULL != 18446744073709551615ULL
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#error "uh oh"
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#endif
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// Test that unsigned overflow causes silent wraparound.
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#if 18446744073709551615ULL + 1ULL != 0 // Silently wraps to 0.
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#error "uh oh"
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#endif
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#if 0ULL - 1ULL != 18446744073709551615ULL // Silently wraps to 0xFFFF'FFFF'FFFF'FFFF.
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#error "uh oh"
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#endif
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// Now test that signed arithmetic that pushes us over a limit is properly
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// diagnosed.
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#if 9223372036854775807LL + 1LL // expected-warning {{integer overflow in preprocessor expression}}
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#endif
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#if -9223372036854775807LL - 2LL // expected-warning {{integer overflow in preprocessor expression}}
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#endif
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