Viewing file:  pr33848.c (1.19 KB) -rw-r--r--
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/* &&foo should be hoisted, but on most targets, excess register pressure
forces it to be rematerialized before "data != &&foo". On targets that
have a "branch if registers are equal" instruction, this leads to the
branch having two LABEL_REFs: one for the branch target and one for
&&foo. When reloading &&foo into a register, reload would wrongly
say that &&foo was the target of the branch, and the real target would
then be removed as dead. */
/* { dg-do link } */
/* { dg-require-effective-target label_values } */
#define NVARS 30
#define MULTI(X) \
X( 0), X( 1), X( 2), X( 3), X( 4), X( 5), X( 6), X( 7), X( 8), X( 9), \
X(10), X(11), X(12), X(13), X(14), X(15), X(16), X(17), X(18), X(19), \
X(20), X(21), X(22), X(23), X(24), X(25), X(26), X(27), X(28), X(29)
#define DECLARE(INDEX) i##INDEX = gv[INDEX]
#define COPY(INDEX) gv[INDEX] = i##INDEX
volatile int gv[NVARS];
void *volatile data;
int
main (void)
{
__label__ foo;
if (gv[0] == 1)
goto foo;
data = &&foo;
do
{
int MULTI (DECLARE);
MULTI (COPY);
MULTI (COPY);
MULTI (COPY);
if (data != &&foo)
gv[0] = 1;
else
gv[1] = 2;
}
while (gv[0] > 0);
foo:
return 0;
}
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