Viewing file:  const-elim-1.c (1.12 KB) -rw-r--r--
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/* Verify that constants in memory, referenced only by dead code,
are not emitted to the object file.
FIXME: Not presently possible to apply -pedantic to code with
complex constants in it. The __extension__ should shut up the
warning but doesn't. (Hard to fix -- the lexer is not aware of
the parser's state.) */
/* { dg-do compile } */
/* { dg-options "-O2 -std=c99" } */
/* { dg-final { scan-assembler-not "L\\\$?C\[^A-Z\]" } } */
#define I (__extension__ 1.0iF)
struct S { int a; double b[2]; void *c; };
extern void use_str(const char *);
extern void use_S(const struct S *);
extern void use_cplx(__complex__ double);
static inline int
returns_23(void) { return 23; }
void
test1(void)
{
if (returns_23() == 23)
return;
use_str("waltz, nymph, for quick jigs vex bud");
use_S(&(const struct S){12, {3.1415, 2.1828}, 0 });
use_cplx(3.1415 + 2.1828*I);
}
void
test2(void)
{
const char *str = "pack my box with five dozen liquor jugs";
const struct S S = { 23, { 1.414, 1.618 }, 0 };
const __complex__ double cplx = 1.414 + 1.618*I;
if (returns_23() == 23)
return;
use_str(str);
use_S(&S);
use_cplx(cplx);
}
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