clang/test/Sema/implicit-int-float-conversion.c

   1 // RUN: %clang_cc1 %s -verify -Wno-constant-conversion
   2 // RUN: %clang_cc1 %s -verify -Wno-constant-conversion -Wno-implicit-int-float-conversion -Wimplicit-const-int-float-conversion
   3 // RUN: %clang_cc1 %s -DNONCONST=1 -verify -Wno-constant-conversion -Wimplicit-int-float-conversion
   4
   5 #ifdef NONCONST
   6 long testReturn(long a, float b) {
   7   return a + b; // expected-warning {{implicit conversion from 'long' to 'float' may lose precision}}
   8 }
   9 #endif
  10
  11 void testAssignment(void) {
  12   float f = 222222;
  13   double b = 222222222222L;
  14
  15   float ff = 222222222222L;    // expected-warning {{changes value from 222222222222 to 222222221312}}
  16   float ffff = 222222222222UL; // expected-warning {{changes value from 222222222222 to 222222221312}}
  17
  18   long l = 222222222222L;
  19 #ifdef NONCONST
  20   float fff = l; // expected-warning {{implicit conversion from 'long' to 'float' may lose precision}}
  21 #endif
  22 }
  23
  24 void testExpression(void) {
  25   float a = 0.0f;
  26
  27   float b = 222222222222L + a; // expected-warning {{changes value from 222222222222 to 222222221312}}
  28
  29   float g = 22222222 + 22222222;
  30   float c = 22222222 + 22222223; // expected-warning {{implicit conversion from 'int' to 'float' changes value from 44444445 to 44444444}}
  31
  32   int i = 0;
  33 #ifdef NONCONST
  34   float d = i + a; // expected-warning {{implicit conversion from 'int' to 'float' may lose precision}}
  35 #endif
  36
  37   double e = 0.0;
  38   double f = i + e;
  39 }
  40
  41 void testCNarrowing(void) {
  42   // Since this is a C file. C++11 narrowing is not in effect.
  43   // In this case, we should issue warnings.
  44   float a = {222222222222L}; // expected-warning {{changes value from 222222222222 to 222222221312}}
  45
  46   long b = 222222222222L;
  47 #ifdef NONCONST
  48   float c = {b}; // expected-warning {{implicit conversion from 'long' to 'float' may lose precision}}
  49 #endif
  50 }