gcc/testsuite/gcc.dg/Wdouble-promotion.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Wdouble-promotion" } */
   3
   4 #include <stddef.h>
   5
   6 /* Some targets do not provide <complex.h> so we define I ourselves.  */
   7 #define I 1.0iF
   8 #define ID ((_Complex double)I)
   9
  10 float f;
  11 double d;
  12 int i;
  13 long double ld;
  14 _Complex float cf;
  15 _Complex double cd;
  16 _Complex long double cld;
  17 size_t s;
  18
  19 extern void unprototyped_fn ();
  20 extern void varargs_fn (int, ...);
  21 extern void double_fn (double);
  22 extern float float_fn (void);
  23
  24 void
  25 usual_arithmetic_conversions(void)
  26 {
  27   float local_f;
  28   _Complex float local_cf;
  29
  30   /* Values of type "float" are implicitly converted to "double" or
  31      "long double" due to use in arithmetic with "double" or "long
  32      double" operands.  */
  33   local_f = f + 1.0;         /* { dg-warning "implicit" } */
  34   local_f = f - d;           /* { dg-warning "implicit" } */
  35   local_f = 1.0f * 1.0;      /* { dg-warning "implicit" } */
  36   local_f = 1.0f / d;        /* { dg-warning "implicit" } */
  37
  38   local_cf = cf + 1.0;       /* { dg-warning "implicit" } */
  39   local_cf = cf - d;         /* { dg-warning "implicit" } */
  40   local_cf = cf + 1.0 * ID;  /* { dg-warning "implicit" } */
  41   local_cf = cf - cd;        /* { dg-warning "implicit" } */
  42
  43   local_f = i ? f : d;       /* { dg-warning "implicit" } */
  44   i = f == d;                /* { dg-warning "implicit" } */
  45   i = d != f;                /* { dg-warning "implicit" } */
  46 }
  47
  48 void
  49 default_argument_promotion (void)
  50 {
  51   /* Because there is no prototype, "f" is promoted to "double".  */
  52   unprototyped_fn (f); /* { dg-warning "implicit" } */
  53   undeclared_fn (f);   /* { dg-warning "implicit" } */
  54   /* Because "f" is part of the variable argument list, it is promoted
  55      to "double".  */
  56   varargs_fn (1, f);   /* { dg-warning "implicit" } */
  57 }
  58
  59 /* There is no warning when an explicit cast is used to perform the
  60    conversion.  */
  61
  62 void
  63 casts (void)
  64 {
  65   float local_f;
  66   _Complex float local_cf;
  67
  68   local_f = (double)f + 1.0;                 /* { dg-bogus "implicit" } */
  69   local_f = (double)f - d;                   /* { dg-bogus "implicit" } */
  70   local_f = (double)1.0f + 1.0;              /* { dg-bogus "implicit" } */
  71   local_f = (double)1.0f - d;                /* { dg-bogus "implicit" } */
  72
  73   local_cf = (_Complex double)cf + 1.0;      /* { dg-bogus "implicit" } */
  74   local_cf = (_Complex double)cf - d;        /* { dg-bogus "implicit" } */
  75   local_cf = (_Complex double)cf + 1.0 * ID; /* { dg-bogus "implicit" } */
  76   local_cf = (_Complex double)cf - cd;       /* { dg-bogus "implicit" } */
  77
  78   local_f = i ? (double)f : d;               /* { dg-bogus "implicit" } */
  79   i = (double)f == d;                        /* { dg-bogus "implicit" } */
  80   i = d != (double)f;                        /* { dg-bogus "implicit" } */
  81 }
  82
  83 /* There is no warning on conversions that occur in assignment (and
  84    assignment-like) contexts.  */
  85
  86 void
  87 assignments (void)
  88 {
  89   d = f;           /* { dg-bogus "implicit" } */
  90   double_fn (f);   /* { dg-bogus "implicit" } */
  91   d = float_fn (); /* { dg-bogus "implicit" } */
  92 }
  93
  94 /* There is no warning in non-evaluated contexts.  */
  95
  96 void
  97 non_evaluated (void)
  98 {
  99   s = sizeof (f + 1.0);             /* { dg-bogus "implicit" } */
 100   s = __alignof__ (f + 1.0);        /* { dg-bogus "implicit" } */
 101   d = (__typeof__(f + 1.0))f;       /* { dg-bogus "implicit" } */
 102   s = sizeof (i ? f : d);           /* { dg-bogus "implicit" } */
 103   s = sizeof (unprototyped_fn (f)); /* { dg-bogus "implicit" } */
 104 }