34 lines · cpp
1// RUN: %clang_cc1 -std=c++1y -verify %s2// RUN: %clang_cc1 -std=c++1y -verify -fexperimental-new-constant-interpreter %s3 4// expected-no-diagnostics5constexpr void copy(const char *from, unsigned long count, char *to) {6 unsigned long n = (count + 7) / 8;7 switch(count % 8) {8 case 0: do { *to++ = *from++;9 case 7: *to++ = *from++;10 case 6: *to++ = *from++;11 case 5: *to++ = *from++;12 case 4: *to++ = *from++;13 case 3: *to++ = *from++;14 case 2: *to++ = *from++;15 case 1: *to++ = *from++;16 } while(--n > 0);17 }18}19 20struct S {21 char stuff[14];22 constexpr S() : stuff{} {23 copy("Hello, world!", 14, stuff);24 }25};26 27constexpr bool streq(const char *a, const char *b) {28 while (*a && *a == *b) ++a, ++b;29 return *a == *b;30}31 32static_assert(streq(S().stuff, "Hello, world!"), "should be same");33static_assert(!streq(S().stuff, "Something else"), "should be different");34