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Diffstat (limited to 'results/classifier/deepseek-2-tmp/reasoning/mistranslation/1861404')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/reasoning/mistranslation/1861404 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/results/classifier/deepseek-2-tmp/reasoning/mistranslation/1861404 b/results/classifier/deepseek-2-tmp/reasoning/mistranslation/1861404 new file mode 100644 index 000000000..189579efa --- /dev/null +++ b/results/classifier/deepseek-2-tmp/reasoning/mistranslation/1861404 @@ -0,0 +1,21 @@ +<think> +Okay, so I've got this bug report about QEMU not handling AVX instructions correctly for YMM registers. The user is reporting that when they use the VMOVDQU instruction with YMM registers (which are 32 bytes), only half of the data gets copied. It works fine with XMM registers (16 bytes). + +Looking at the code snippets provided, it seems like the issue lies in the translation part of QEMU. The function `gen_sse` handles various AVX instructions, and for VMOVDQU, it calls `gen_ldo_env_A0`. But from the description, this function is only copying 16 bytes because it's using two 8-byte operations. + +Wait, so `gen_ldo_env_A0` uses `tcg_gen_qemu_ld_i64` which loads 8 bytes at a time. It does this twice, which explains why only half of the YMM data (which is 32 bytes) is being copied. For XMM registers (16 bytes), this works because it's exactly two times 8 bytes. + +The user suggests that `gen_ldo_env_A0` should instead handle a size corresponding to the register used. So for YMM, which is 32 bytes, it needs to copy four sets of 8 bytes or perhaps use a larger operation. + +Hmm, so this isn't an issue with device emulation, graphics, networking, etc., but rather with how QEMU translates AVX instructions into the target code. Specifically, it's about handling YMM registers correctly during translation. Since it's related to assembly lowering and incorrect handling of register size, the category should be 'mistranslation'. + +I think that's the right category because it's about how the source architecture (x86 with AVX) is being translated into the target code in QEMU. The function isn't correctly mapping the 32-byte YMM registers, leading to an incorrect implementation. +</think> + +The bug report describes an issue where QEMU incorrectly handles the VMOVDQU instruction for YMM registers, causing only half of the data to be copied. This is due to `gen_ldo_env_A0` using 8-byte operations instead of handling the full 32-byte YMM size. + +**Category: mistranslation** + +The issue arises from incorrect mapping during translation, specifically in how AVX instructions are processed for YMM registers. + +mistranslation \ No newline at end of file |