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Diffstat (limited to 'results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/1833')
| -rw-r--r-- | results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/1833 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/1833 b/results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/1833 new file mode 100644 index 00000000..e8dd75d3 --- /dev/null +++ b/results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/1833 @@ -0,0 +1,21 @@ +The issue described pertains to an incorrect implementation of the ARM64 SME ST1Q instruction within QEMU, leading to improper data storage. This is classified under **instruction** as it involves a specific faulty CPU instruction implementation. + +**Step-by-Step Explanation:** + +1. **Understanding the Bug:** The problem lies in how the `ST1Q` (Store 128-bit element) SME instruction is implemented in QEMU. Instead of correctly storing 16 bytes per 128-bit element, it only stores 9 bytes. + +2. **Identifying the Cause:** The incorrect behavior was traced to a specific line in QEMU's source code (`sme_helper.c`), where an offset adjustment used `+1` instead of `+8`, leading to improper data alignment and storage. + +3. **Reproducing the Issue:** A test program was provided that demonstrates the bug. When run, it shows that after executing the `ST1Q` instruction, only a portion of the expected bytes are correctly copied from source to destination memory locations. + +4. **Impact Analysis:** This bug affects data integrity when using SME instructions in QEMU, particularly for contiguous store operations involving 128-bit elements. Such errors can lead to silent data corruption or incorrect program behavior in applications relying on these instructions. + +5. **Solution:** The fix involves correcting the offset adjustment from `+1` to `+8`, ensuring that each 128-bit element is stored correctly as 16 bytes, aligning with the expected behavior of the `ST1Q` instruction. + +**Classification: Instruction** + +The bug report revolves around an issue with a specific CPU instruction's implementation within QEMU. Therefore, it falls under the **instruction** category. + +```plaintext +instruction +``` \ No newline at end of file |