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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/deepseek-r1:14b/reasoning/mistranslation/1605123
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloadqemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
qemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
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+<think>
+Okay, I need to classify this bug report into one of the given categories. The user mentioned that PEXT instructions in QEMU are returning wrong values and seem to switch arguments. They suspect the issue is with gen_helper_pext() in target-i386/translate.c. They also checked helper_pext in int_helper.c and it works fine.
+
+So, PEXT is a BMI2 instruction. The problem occurs when emulating with QEMU's x86_64 CPU set to Haswell. The user tested on real hardware and saw different results, so the issue is likely in QEMU's emulation of the instruction.
+
+Looking at the categories: mistranslation refers to incorrect semantic mapping from source architecture to IR/target, which can happen in user-mode assembly lowering. Since PEXT is an x86 instruction being emulated incorrectly, this falls under how instructions are translated or handled in the code generation phase.
+
+Other possibilities include 'assembly' but that's more about assembly code issues, not translation. The issue isn't with device drivers, graphics, sockets, network, KVM, boot, VNC, debug, files, permissions, performance, kernel, peripherals, or hypervisor.
+
+Therefore, the bug is in how QEMU translates the PEXT instruction into its internal representation, leading to incorrect behavior. So it's a mistranslation issue.
+</think>
+
+mistranslation
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