https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121064
Xi Ruoyao <xry111 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |xry111 at gcc dot
gnu.org
Status|UNCONFIRMED |ASSIGNED
Ever confirmed|0 |1
CC| |chenglulu at loongson dot cn,
| |xen0n at gentoo dot org
--- Comment #6 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
Reduced test case:
typedef __INT32_TYPE__ int32_t;
typedef unsigned __INT32_TYPE__ uint32_t;
__attribute__((noipa))
static void long_filter_ehigh_3830_1(int32_t *buffer, int length)
{
int i, j;
int32_t dotprod = 0;
int32_t delay[4] = { 0 };
uint32_t coeffs[4] = { 0 };
for (i = 0; i < length; i++) {
dotprod = 0;
for (j = 3; j >= 0; j--) {
dotprod += delay[j] * coeffs[j];
coeffs[j] += ((delay[j] >> 31) | 1);
}
for (j = 3; j > 0; j--)
delay[j] = delay[j - 1];
delay[0] = buffer[i];
}
__builtin_printf("%d\n", dotprod);
}
int main()
{
int32_t buffer[] = {-1, 1};
long_filter_ehigh_3830_1(buffer, 2);
}
The output should be -1, but with gcc-15 -mlsx it produces 8 instead.
I'm working on it.
