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Re: [Qemu-riscv] [Qemu-devel] [RFC v1 20/23] riscv: tcg-target: Add the

From: Richard Henderson
Subject: Re: [Qemu-riscv] [Qemu-devel] [RFC v1 20/23] riscv: tcg-target: Add the target init code
Date: Tue, 20 Nov 2018 07:55:22 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0

On 11/20/18 12:04 AM, Alistair Francis wrote:
> On Fri, Nov 16, 2018 at 9:26 AM Richard Henderson
> <address@hidden> wrote:
>> On 11/15/18 11:36 PM, Alistair Francis wrote:
>>> +    tcg_regset_set_reg(s->reserved_regs, TCG_REG_L0);
>>> +    tcg_regset_set_reg(s->reserved_regs, TCG_REG_L1);
>>> +    tcg_regset_set_reg(s->reserved_regs, TCG_REG_RA);
>> Why are these three reserved?
> Do these not need to be? I thought we had to reserve them.

The return address, I presume, has been saved by the prologue.  I see no reason
why it can't be yet another call-clobbered register.

As for the other two... what are they supposed to be?


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