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/* { dg-do run } */
/* { dg-options "-O3 -mhtm -Wa,-march=zEC12,-mzarch --save-temps" } */
/* __builtin_tbegin has to emit clobbers for all FPRs since the tbegin
instruction does not automatically preserves them. If the
transaction body is fully contained in a function the backend tries
after reload to get rid of the FPR save/restore operations
triggered by the clobbers. This testcase failed since the backend
was able to get rid of all FPR saves/restores and since these were
the only stack operations also of the entire stack space. So even
the save/restore of the stack pointer was omitted in the end.
However, since the frame layout has been fixed before, the prologue
still generated the stack pointer decrement making foo return with
a modified stack pointer. */
void abort(void);
void __attribute__((noinline))
foo (int a)
{
/* This is just to prevent the tbegin code from actually being
executed. That way the test may even run on machines prior to
zEC12. */
if (a == 42)
return;
if (__builtin_tbegin (0) == 0)
__builtin_tend ();
}
#ifdef __s390x__
#define GET_STACK_POINTER(SP) \
asm volatile ("stg %%r15, %0" : "=QRST" (SP));
#else
#define GET_STACK_POINTER(SP) \
asm volatile ("st %%r15, %0" : "=QR" (SP));
#endif
int main(void)
{
unsigned long new_sp, old_sp;
GET_STACK_POINTER (old_sp);
foo(42);
GET_STACK_POINTER (new_sp);
if (old_sp != new_sp)
abort ();
return 0;
}
/* Make sure no FPR saves/restores are emitted. */
/* { dg-final { scan-assembler-not "\tstd\t" } } */
/* { dg-final { scan-assembler-not "\tld\t" } } */
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