r187096 - Add another C++14 constexpr test case.

[Matthieu Monrocq]

C++14 constexpr are seriously starting to look awesome!


On Thu, Jul 25, 2013 at 3:53 AM, Richard Smith
<richard-llvm at metafoo.co.uk>wrote:

> Author: rsmith
> Date: Wed Jul 24 20:53:54 2013
> New Revision: 187096
>
> URL: http://llvm.org/viewvc/llvm-project?rev=187096&view=rev
> Log:
> Add another C++14 constexpr test case.
>
> Added:
>     cfe/trunk/test/SemaCXX/constexpr-duffs-device.cpp
>
> Added: cfe/trunk/test/SemaCXX/constexpr-duffs-device.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/constexpr-duffs-device.cpp?rev=187096&view=auto
>
> ==============================================================================
> --- cfe/trunk/test/SemaCXX/constexpr-duffs-device.cpp (added)
> +++ cfe/trunk/test/SemaCXX/constexpr-duffs-device.cpp Wed Jul 24 20:53:54
> 2013
> @@ -0,0 +1,32 @@
> +// RUN: %clang_cc1 -std=c++1y -verify %s
> +
> +// expected-no-diagnostics
> +constexpr void copy(const char *from, unsigned long count, char *to) {
> +        unsigned long n = (count + 7) / 8;
> +        switch(count % 8) {
> +        case 0: do {    *to++ = *from++;
> +        case 7:         *to++ = *from++;
> +        case 6:         *to++ = *from++;
> +        case 5:         *to++ = *from++;
> +        case 4:         *to++ = *from++;
> +        case 3:         *to++ = *from++;
> +        case 2:         *to++ = *from++;
> +        case 1:         *to++ = *from++;
> +                } while(--n > 0);
> +        }
> +}
> +
> +struct S {
> +  char stuff[14];
> +  constexpr S() : stuff{} {
> +    copy("Hello, world!", 14, stuff);
> +  }
> +};
> +
> +constexpr bool streq(const char *a, const char *b) {
> +  while (*a && *a == *b) ++a, ++b;
> +  return *a == *b;
> +}
> +
> +static_assert(streq(S().stuff, "Hello, world!"), "should be same");
> +static_assert(!streq(S().stuff, "Something else"), "should be different");
>
>
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