Re: [PATCH 0/6] tcg: Introduce constraint for zero register

[Richard Henderson <richard.henderson@linaro.org>]

On 2/11/25 19:46, Richard Henderson wrote:
> Based-on:20250205040341.2056361-1-richard.henderson@linaro.org
> ("[PATCH 00/11] tcg: Cleanups after disallowing 64-on-32")
> 
> Introduce a new general-purpose constraint which maps 0
> to TCG_REG_ZERO, if defined.  This differs from existing
> constant constraints in that const_arg[*] is recorded as
> false, indicating that the value is in a register.
> 
> This doesn't make much difference to the current tree, but as a
> prelude to [1], where small output functions are categorized by
> register vs immediate arguments, then this provides a way to
> send a constant zero as a register argument.
> 
> 
> r~
> 
> 
> [1]https://patchew.org/QEMU/20250107080112.1175095-1-richard.henderson@linaro.org/
> 
> Richard Henderson (6):
>    tcg: Introduce the 'z' constraint for a hardware zero register
>    tcg/aarch64: Use 'z' constraint
>    tcg/loongarch64: Use 'z' constraint
>    tcg/mips: Use 'z' constraint
>    tcg/riscv: Use 'z' constraint
>    tcg/sparc64: Use 'z' constraint

Queued.


r~