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Diffstat (limited to 'results/classifier/qwen3:32b/reasoning/instruction/2865')
| -rw-r--r-- | results/classifier/qwen3:32b/reasoning/instruction/2865 | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/results/classifier/qwen3:32b/reasoning/instruction/2865 b/results/classifier/qwen3:32b/reasoning/instruction/2865 new file mode 100644 index 000000000..153973e61 --- /dev/null +++ b/results/classifier/qwen3:32b/reasoning/instruction/2865 @@ -0,0 +1,13 @@ +<think> +Okay, let's see. The user provided a bug report about Qemu's handling of the LoongArch64 `xvldi` instruction. The problem is that when they run a C++ program using this instruction, the output differs between real hardware and Qemu. The expected output is all 0x00000800 values, but Qemu produces alternating 0x08000800 and zeros. + +Looking at the code, the issue is in the `vldi_get_value` function within Qemu's source. The case for 1 is supposed to generate a 32-bit pattern. The current code does `(t << 24) | (t << 8)`, but the user suggests it should be `(t << (8+32)) | t << 8`. Wait, shifting by 32 bits in a 32-bit integer would zero it out. Maybe the data is being treated as 64-bit? Or perhaps the LoongArch instruction expects the immediate to be replicated in a certain way across the vector. + +The `xvldi` instruction is a vector load immediate. The description mentions replicating a byte shifted left by 8, resulting in 0x800 (which is 0x0800 in hex). On real hardware, each 32-bit word is 0x00000800. But Qemu's code is creating a pattern where the immediate is placed at both high and low positions in a 64-bit context, leading to 0x08000800 when stored as a 32-bit value. + +The user points out that the Qemu code for case 1 is using `(t << 24) | (t << 8)`, which would create a 32-bit value with the immediate in bits 8-15 and 24-31. But when this is stored into a 32-bit word, it would result in 0x08000800. However, the correct value should be 0x00000800 repeated. So the problem is that Qemu's implementation of the `xvldi` instruction is incorrect. The suggested fix is to shift one part by 32+8 bits. Maybe the original code is handling 64-bit elements? Or perhaps the instruction's encoding requires replicating the immediate into specific positions across multiple 32-bit words. + +Since the issue is in the translation of the `xvldi` instruction's immediate value into the correct vector pattern, this is a direct error in how the instruction is implemented in Qemu. Therefore, the category should be "instruction". +</think> + +instruction \ No newline at end of file |