24 lines · c
1// RUN: %clang_cc1 %s -verify -Wconversion -fsyntax-only -triple x86_64-pc-linux-gnu2// RUN: %clang_cc1 %s -verify -Wconversion -fsyntax-only -triple i386-pc-linux-gnu3 4void test(void) {5 unsigned int a = 1;6 7 unsigned long long b = -a; // expected-warning {{higher order bits are zeroes after implicit conversion}}8 long long c = -a; // expected-warning {{the resulting value is always non-negative after implicit conversion}}9 10 unsigned long b2 = -a;11#ifdef __x86_64__12// expected-warning@-2 {{higher order bits are zeroes after implicit conversion}}13#endif14 long c2 = -a;15#ifdef __x86_64__16// expected-warning@-2 {{the resulting value is always non-negative after implicit conversion}}17#else18// expected-warning@-4 {{implicit conversion changes signedness: 'unsigned int' to 'long'}}19#endif20 21 unsigned m;22 int n = -(m & 0xff); // no warning23}24