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authorChristian Krinitsin <mail@krinitsin.com>2025-06-03 12:04:13 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-06-03 12:04:13 +0000
commit256709d2eb3fd80d768a99964be5caa61effa2a0 (patch)
tree05b2352fba70923126836a64b6a0de43902e976a /results/classifier/105/assembly/1862167
parent2ab14fa96a6c5484b5e4ba8337551bb8dcc79cc5 (diff)
downloademulator-bug-study-256709d2eb3fd80d768a99964be5caa61effa2a0.tar.gz
emulator-bug-study-256709d2eb3fd80d768a99964be5caa61effa2a0.zip
add new classifier result
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+assembly: 0.936
+graphic: 0.779
+instruction: 0.715
+device: 0.706
+other: 0.701
+semantic: 0.633
+vnc: 0.621
+network: 0.540
+mistranslation: 0.456
+socket: 0.431
+KVM: 0.390
+boot: 0.382
+
+Variation of SVE register size (qemu-user-aarch64)
+
+Specification of ARMv8-A SVE extention allows various values ​​for the size of the SVE register. On the other hand, it seems that the current qemu-aarch64 supports only the maximum length of 2048 bits as the SVE register size. I am writing an assembler program for a CPU that is compliant with ARMv8-A + SVE and has a 512-bit SVE register, but when this is run with qemu-user-aarch64, a 2048-bit load / store instruction is executed This causes a segmentation fault. Shouldn't qeum-user-aarch64 have an option to specify the SVE register size?
+
+This is already managed by a cpu property.
+
+0df9142d27d5 ("target/arm/cpu64: max cpu: Introduce sve<N> properties")
+
+See docs/arm-cpu-features.rst
+
+Try "-cpu max,sve512=on".
+
+
+
+Note also that the vector length in SVE is not fixed -- you should be writing your guest code to support arbitrary vector lengths, because otherwise it will not run on all SVE-supporting CPUs.
+
+
+Thank you for your kind advice. I'll try it.
+