Hi, I have checked SDnode in LLVM which is a similiar data structure with RTX in GCC.
The SDnode in LLVM occupy 80bytes. 
Can we have some tool to test the memory consuming of the whole GCC with extended-size RTX?



juzhe.zhong@rivai.ai
 
From: Jeff Law
Date: 2023-04-11 04:42
To: juzhe.zhong; jakub
CC: 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 09:22, juzhe.zhong@rivai.ai wrote:
> Yeah, aarch64 already has 178, RVV has much more types than aarch64...
> You can see intrinsic doc:
> https://github.com/riscv-non-isa/rvv-intrinsic-doc/blob/eopc/tuple-type-for-seg-load-store/auto-generated/intrinsic_funcs/02_vector_unit-stride_segment_load_store_instructions_zvlsseg.md <https://github.com/riscv-non-isa/rvv-intrinsic-doc/blob/eopc/tuple-type-for-seg-load-store/auto-generated/intrinsic_funcs/02_vector_unit-stride_segment_load_store_instructions_zvlsseg.md>
> api number explodes.
> 
> As well as tuples types in RVV much more than aarch64.
> Maybe we need to ask RVV api doc maintainer to reduce types && api of RVV?
> Not sure.
> I think kito may help for this.
I think it's a discussion we need to have.  I really expect efforts to 
have > 256 modes are going to be very controversial.
 
jeff