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Re: [Qemu-devel] [PATCH v3 38/39] tcg/arm: Use LDRD to load tlb mask+tab

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v3 38/39] tcg/arm: Use LDRD to load tlb mask+table
Date: Sat, 11 May 2019 12:13:32 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 5/10/19 2:08 PM, Alistair Francis wrote:
>> +        if (use_armv6_instructions && TARGET_LONG_BITS == 64) {
>> +            tcg_out_ldrd_8(s, COND_AL, TCG_REG_R2, TCG_REG_R1, cmp_off);
> This is complex and I'm probably misunderstanding something but isn't
> it possible for TCG_REG_R3 to not be set if use_armv6_instructions is
> true and TARGET_LONG_BITS is 64?

No, the LDRD instruction loads data into both R2 and R2+1 = R3.


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