[Bug target/111720] RISC-V: Ugly codegen in RVV

[juzhe.zhong at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111720

--- Comment #9 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
(In reply to Andrew Pinski from comment #7)
> .

Besides, if we remove the data initialization:


https://godbolt.org/z/qcjcP7s1c

#include<riscv_vector.h>
vuint8m1_t fn() {

    uint8_t arr[32];
    uint8_t m = 1;

    vuint8m1_t varr = __riscv_vle8_v_u8m1(arr, 32);
    vuint8m1_t vand_m = __riscv_vand_vx_u8m1(varr, m, 32);
    //vbool8_t vmask = __riscv_vreinterpret_v_u8m1_b8(vand_m);

    return vand_m;
}

The issue is gone:

fn:
        addi    sp,sp,-32
        li      a5,32
        vsetvli zero,a5,e8,m1,ta,ma
        vle8.v  v24,0(sp)
        vand.vi v24,v24,1
        vs1r.v  v24,0(a0)
        addi    sp,sp,32
        jr      ra

The codegen as good as LLVM.

I still think it is something like constant memory pool issue.