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Re: [PATCH 00/48] tcg: optimize redundant sign extensions


From: Philippe Mathieu-Daudé
Subject: Re: [PATCH 00/48] tcg: optimize redundant sign extensions
Date: Tue, 31 Aug 2021 00:00:33 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

Hi Richard,

On 8/30/21 8:24 AM, Richard Henderson wrote:
> Currently, we have support for optimizing redundant zero extensions,
> which I think was done with x86 and aarch64 in mind, which zero-extend
> all 32-bit operations into the 64-bit register.
> 
> But targets like Alpha, MIPS, and RISC-V do sign-extensions instead.
> The last 5 patches address this.
> 
> But before that, split the quite massive tcg_optimize function.

Looks promising after quick review. Do you have any comparison perf numbers?



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