[Bug target/114639] [riscv] ICE in create_pre_exit, at mode-switching.cc:451

["pan2.li at intel dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114639

--- Comment #5 from Li Pan <pan2.li at intel dot com> ---
(In reply to Kito Cheng from comment #4)
> Reduced case:
> ```c
> typedef long c;
> #pragma riscv intrinsic "vector"
> template <unsigned long> struct d {};
> struct e {
>   using f = d<0>;
> };
> struct g {
>   using f = e::f;
> };
> template <typename, int> using h = g::f;
> template <unsigned long i> long k(d<i>);
> vbool16_t j(vuint64m4_t a) {
>   c b;
>   return __riscv_vmsne_vx_u64m4_b16(a, b, k(h<c, 2>()));
> }
> 
> ```

Thanks Kito, reproduced on reduced case with option "riscv64-unknown-elf-g++
-O2 -march=rv64gcv". will take a look into it.


during RTL pass: mode_sw
test.c: In function ‘vbool16_t j(vuint64m4_t)’:
test.c:15:1: internal compiler error: in create_pre_exit, at
mode-switching.cc:451
   15 | }
      | ^
0x3978f12 create_pre_exit                                                      
                                                                               
                                                        
/home/pli/gcc/555/riscv-gnu-toolchain/gcc/__RISCV_BUILD__/../gcc/mode-switching.cc:451
0x3979e9e optimize_mode_switching
       
/home/pli/gcc/555/riscv-gnu-toolchain/gcc/__RISCV_BUILD__/../gcc/mode-switching.cc:849
0x397b9bc execute
       
/home/pli/gcc/555/riscv-gnu-toolchain/gcc/__RISCV_BUILD__/../gcc/mode-switching.cc:1324
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