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| From: | Jiajie Chen |
| Subject: | Re: [PATCH 0/5] Add LoongArch v1.1 instructions |
| Date: | Tue, 24 Oct 2023 14:10:54 +0800 |
| User-agent: | Mozilla Thunderbird |
On 2023/10/24 07:26, Richard Henderson wrote:
On 10/23/23 08:29, Jiajie Chen wrote:This patch series implements the new instructions except sc.q, because I do not know how to match a pair of ll.d to sc.q.There are a couple of examples within the tree. See target/arm/tcg/translate-a64.c, gen_store_exclusive, TCGv_i128 block. See target/ppc/translate.c, gen_stqcx_.
The situation here is slightly different: aarch64 and ppc64 have both 128-bit ll and sc, however LoongArch v1.1 only has 64-bit ll and 128-bit sc. I guest the intended usage of sc.q is:
ll.d lo, base, 0 ll.d hi, base, 4 # do some computation sc.q lo, hi, base # try again if sc failed
r~
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