I don't know, maybe we can try to ask rvv-intrinsic-doc define so many tuple types and try to 
make them reduce the api && tuple types?

I am going to remove all FP16 vector to see whether we can reduce machine modes <= 256.
I think it may be probably helping to fix that.



juzhe.zhong@rivai.ai
 
From: Jeff Law
Date: 2023-04-11 04:36
To: Jakub Jelinek
CC: juzhe.zhong; gcc-patches; kito.cheng; palmer; richard.sandiford; rguenther
Subject: Re: [PATCH] machine_mode type size: Extend enum size from 8-bit to 16-bit
 
 
On 4/10/23 09:18, Jakub Jelinek wrote:
> On Mon, Apr 10, 2023 at 08:54:12AM -0600, Jeff Law wrote:
>> This is likely going to be very controversial.  It's going to increase the
>> size of two of most heavily used data structures in GCC (rtx and trees).
>>
>> The first thing I would ask is whether or not we really need the full matrix
>> in practice or if we can combine some of the modes.
>>
>> Why hasn't aarch64 stumbled over this problem?
> 
>  From what I can see, x86 has 130 modes and aarch64 178 right now.
To put it another way.  Why does RISC-V have so many more modes than 
AArch64.
 
Jeff