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Diffstat (limited to 'results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/2374')
| -rw-r--r-- | results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/2374 | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/2374 b/results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/2374 new file mode 100644 index 00000000..db22962c --- /dev/null +++ b/results/classifier/no-thinking-deepseek-r1:70b/reasoning/instruction/2374 @@ -0,0 +1,20 @@ +The issue lies within the implementation of the FMOPA/FMOPS instructions in QEMU's AArch64 TCG helper functions. Specifically, the problem arises from an invalid pointer being used for floating-point status when handling 32-bit operands, leading to incorrect NaN generation. + +Step-by-step explanation: + +1. **Bug Identification**: + - The `sme_fmopa_s` function in `target/arm/tcg/sme_helper.c` is responsible for matrix multiplication and accumulation. + - When performing 32-bit floating-point operations, the function incorrectly uses an invalid pointer (`vst`) instead of a properly initialized local copy (`fpst`) to handle the floating-point status. + +2. **Consequences**: + - This misuse causes NaN results not to be generated as default NaNs but instead retain their non-default form. + - The test case provided demonstrates this by expecting default NaNs (0x0000c07f) but receiving non-default NaNs (0xffffffff). + +3. **Solution**: + - Modify the function to use `&fpst` instead of `vst` when invoking `float32_muladd`. + - This ensures that the correct floating-point status is used, leading to proper default NaN generation. + +4. **Category Classification**: + - The issue pertains directly to an instruction's implementation within QEMU, making it a clear case of an **instruction** bug. + +The problem is classified under the **instruction** category because it involves incorrect behavior in implementing specific CPU instructions (FMOPA/FMOPS) within the QEMU emulator. \ No newline at end of file |