25 lines · c
1// RUN: %clang_cc1 -Wdouble-promotion -Wimplicit-float-conversion %s -triple x86_64-apple-macosx10.12 -verify=x86,expected2// RUN: %clang_cc1 -Wdouble-promotion -Wimplicit-float-conversion %s -triple armv7-apple-ios9.0 -verify=arm,expected3 4// On ARM, long double and double both map to double precision 754s, so there5// isn't any reason to warn on conversions back and forth.6 7long double ld;8double d;9_Float16 f16;10 11int main(void) {12 ld = d; // x86-warning {{implicit conversion increases floating-point precision: 'double' to 'long double'}}13 d = ld; // x86-warning {{implicit conversion loses floating-point precision: 'long double' to 'double'}}14 15 ld += d; // x86-warning {{implicit conversion increases floating-point precision: 'double' to 'long double'}}16 d += ld; // x86-warning {{implicit conversion when assigning computation result loses floating-point precision: 'long double' to 'double'}}17 18 f16 = ld; // expected-warning {{implicit conversion loses floating-point precision: 'long double' to '_Float16'}}19 ld = f16; // expected-warning {{implicit conversion increases floating-point precision: '_Float16' to 'long double'}}20 21 f16 += ld; // expected-warning {{implicit conversion when assigning computation result loses floating-point precision: 'long double' to '_Float16'}}22 ld += f16; // expected-warning {{implicit conversion increases floating-point precision: '_Float16' to 'long double'}}23}24 25