Viewing file:  Wdouble-promotion.c (3.36 KB) -rw-r--r--
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/* { dg-do compile } */
/* { dg-options "-Wdouble-promotion" } */
#include <stddef.h>
/* Some targets do not provide <complex.h> so we define I ourselves. */
#define I 1.0iF
#define ID ((_Complex double)I)
float f;
double d;
int i;
long double ld;
_Complex float cf;
_Complex double cd;
_Complex long double cld;
size_t s;
extern void unprototyped_fn ();
extern void varargs_fn (int, ...);
extern void double_fn (double);
extern float float_fn (void);
void
usual_arithmetic_conversions(void)
{
float local_f;
_Complex float local_cf;
/* Values of type "float" are implicitly converted to "double" or
"long double" due to use in arithmetic with "double" or "long
double" operands. */
local_f = f + 1.0; /* { dg-warning "implicit" } */
local_f = f - d; /* { dg-warning "implicit" } */
local_f = 1.0f * 1.0; /* { dg-warning "implicit" } */
local_f = 1.0f / d; /* { dg-warning "implicit" } */
local_cf = cf + 1.0; /* { dg-warning "implicit" } */
local_cf = cf - d; /* { dg-warning "implicit" } */
local_cf = cf + 1.0 * ID; /* { dg-warning "implicit" } */
local_cf = cf - cd; /* { dg-warning "implicit" } */
local_f = i ? f : d; /* { dg-warning "implicit" } */
i = f == d; /* { dg-warning "implicit" } */
i = d != f; /* { dg-warning "implicit" } */
}
void
default_argument_promotion (void)
{
/* Because there is no prototype, "f" is promoted to "double". */
unprototyped_fn (f); /* { dg-warning "implicit" } */
undeclared_fn (f); /* { dg-warning "implicit" } */
/* Because "f" is part of the variable argument list, it is promoted
to "double". */
varargs_fn (1, f); /* { dg-warning "implicit" } */
}
/* There is no warning when an explicit cast is used to perform the
conversion. */
void
casts (void)
{
float local_f;
_Complex float local_cf;
local_f = (double)f + 1.0; /* { dg-bogus "implicit" } */
local_f = (double)f - d; /* { dg-bogus "implicit" } */
local_f = (double)1.0f + 1.0; /* { dg-bogus "implicit" } */
local_f = (double)1.0f - d; /* { dg-bogus "implicit" } */
local_cf = (_Complex double)cf + 1.0; /* { dg-bogus "implicit" } */
local_cf = (_Complex double)cf - d; /* { dg-bogus "implicit" } */
local_cf = (_Complex double)cf + 1.0 * ID; /* { dg-bogus "implicit" } */
local_cf = (_Complex double)cf - cd; /* { dg-bogus "implicit" } */
local_f = i ? (double)f : d; /* { dg-bogus "implicit" } */
i = (double)f == d; /* { dg-bogus "implicit" } */
i = d != (double)f; /* { dg-bogus "implicit" } */
}
/* There is no warning on conversions that occur in assignment (and
assignment-like) contexts. */
void
assignments (void)
{
d = f; /* { dg-bogus "implicit" } */
double_fn (f); /* { dg-bogus "implicit" } */
d = float_fn (); /* { dg-bogus "implicit" } */
}
/* There is no warning in non-evaluated contexts. */
void
non_evaluated (void)
{
s = sizeof (f + 1.0); /* { dg-bogus "implicit" } */
s = __alignof__ (f + 1.0); /* { dg-bogus "implicit" } */
d = (__typeof__(f + 1.0))f; /* { dg-bogus "implicit" } */
s = sizeof (i ? f : d); /* { dg-bogus "implicit" } */
s = sizeof (unprototyped_fn (f)); /* { dg-bogus "implicit" } */
}
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