https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105014
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
First FAIL minimizes to:
...
typedef __uint128_t T;
union u {
T t;
struct {
unsigned long long x;
unsigned long long y;
} xy;
};
#define PRINT(VAR) \
do \
{ \
__builtin_printf (#VAR ": lo: %llx\n", VAR.xy.x); \
__builtin_printf (#VAR ": hi: %llx\n", VAR.xy.y); \
} \
while (0)
extern T __udivmodti4 (T, T, T *);
int
main (void)
{
union u a, b, mod, div;
a.t = -4;
b.t = 1;
PRINT (a);
PRINT (b);
div.t = __udivmodti4 (a.t, b.t, &mod.t);
PRINT (div);
PRINT (mod);
if (mod.t != 0)
__builtin_abort ();
return 0;
}
...
Fails like this:
...
$ ./install/bin/nvptx-none-run ./pr97459-1.exe
a: lo: fffffffffffffffc
a: hi: ffffffffffffffff
b: lo: 1
b: hi: 0
div: lo: fffffffffffffffd
div: hi: ffffffffffffffff
mod: lo: ffffffffffff
mod: hi: 0
nvptx-run: error getting kernel result: unspecified launch failure
(CUDA_ERROR_LAUNCH_FAILED, 719)
$
...
With -O0 JIT instead:
...
$ ./install/bin/nvptx-none-run -O0 ./pr97459-1.exe
a: lo: fffffffffffffffc
a: hi: ffffffffffffffff
b: lo: 1
b: hi: 0
div: lo: fffffffffffffffc
div: hi: ffffffffffffffff
mod: lo: 0
mod: hi: 0
...
