[Bug ipa/92606] [11/12/13 Regression][avr] invalid merge of symbols in progmem and data sections

[gjl at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92606

--- Comment #24 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #22)
> Should be fixed on trunk.  Confirmation would be nice (checked x86 only).

Tested with: gcc version 14.0.0 20231210 (experimental) (GCC)

Still fails for the progmem test case from above. It still has
.set    xyz,xyz_prog


typedef __UINT16_TYPE__ uint16_t;
typedef __UINT32_TYPE__ uint32_t;

typedef uint32_t T;

#define read_u32(X)                                                     \
    (__extension__(                                                     \
        {                                                               \
            uint16_t __addr16 = (uint16_t)(X);                          \
            uint32_t __result;                                          \
            __asm__ __volatile__ ("lpm %A0, Z+" "\n\t"                  \
                                  "lpm %B0, Z+" "\n\t"                  \
                                  "lpm %C0, Z+" "\n\t"                  \
                                  "lpm %D0, Z" "\n\t"                   \
                                  : "=r" (__result), "+z" (__addr16));  \
            __result;                                                   \
        }))

#define NI __attribute__((noinline,noclone))

__attribute((progmem))
static const T xyz_prog[] = { 123, 123, 123 };

static T xyz[] = { 123, 123, 123 };

volatile int x = 0;

NI void prf (T f)
{
    if (f != 123)
        __builtin_abort();
}

NI void func_progmem()
{
    prf (read_u32 (& xyz_prog[0]));
}

NI void func_ram()
{
    prf (xyz[x]);
}

int main()
{
    func_progmem();
    func_ram();
}