clang/test/Sema/conversion-target-dep.c

   1 // RUN: %clang_cc1 -Wdouble-promotion -Wimplicit-float-conversion %s -triple x86_64-apple-macosx10.12 -verify=x86,expected
   2 // RUN: %clang_cc1 -Wdouble-promotion -Wimplicit-float-conversion %s -triple armv7-apple-ios9.0 -verify=arm,expected
   3
   4 // On ARM, long double and double both map to double precision 754s, so there
   5 // isn't any reason to warn on conversions back and forth.
   6
   7 long double ld;
   8 double d;
   9 _Float16 f16;
  10
  11 int 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