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Re: [PULL 26/42] target/arm: Use tcg_gen_qemu_{ld, st}_i128 in gen_sve_{


From: Mark Cave-Ayland
Subject: Re: [PULL 26/42] target/arm: Use tcg_gen_qemu_{ld, st}_i128 in gen_sve_{ld, st}r
Date: Mon, 12 Jun 2023 19:40:29 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0

On 12/06/2023 16:20, Jonathan Cameron via wrote:

On Tue,  6 Jun 2023 10:47:58 +0100
Peter Maydell <peter.maydell@linaro.org> wrote:

From: Richard Henderson <richard.henderson@linaro.org>

Round len_align to 16 instead of 8, handling an odd 8-byte as part
of the tail.  Use MO_ATOM_NONE to indicate that all of these memory
ops have only byte atomicity.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230530191438.411344-8-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Early in debugging but a git bisect pointed at this patch causing:

ERROR:../../tcg/tcg.c:4317:temp_load: code should not be reached
Bail out! ERROR:../../tcg/tcg.c:4317:temp_load: code should not be reached
Aborted

Just after Run /sbin/init arm64 / virt running on an x86 host.
cpu max.

Just reverting this patch results in length check failures.
I reverted as follows


revert: Revert "target/arm: Use tcg_gen_qemu_{ld, st}_i128 in gen_sve_{ld, st}r"
revert: Revert "target/arm: Sink gen_mte_check1 into load/store_exclusive"
revert: Revert "target/arm: Load/store integer pair with one tcg operation"
revert: Revert "target/arm: Hoist finalize_memop out of do_gpr_{ld, st}"
revert: Revert "target/arm: Hoist finalize_memop out of do_fp_{ld, st}"
revert: Revert "target/arm: Pass memop to gen_mte_check1*"
revert: Revert "target/arm: Pass single_memop to gen_mte_checkN"
revert: Revert "target/arm: Check alignment in helper_mte_check"
revert: Revert "target/arm: Add SCTLR.nAA to TBFLAG_A64"
revert: Revert "target/arm: Relax ordered/atomic alignment checks for LSE2"
revert: Revert "target/arm: Move mte check for store-exclusive"

and all is good - obviously that's probably massive overkill.

Jonathan

Could this possibly be the same as 
https://gitlab.com/qemu-project/qemu/-/issues/1704?


ATB,

Mark.




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