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authorChristian Krinitsin <mail@krinitsin.com>2025-07-06 16:43:19 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-06 16:43:19 +0000
commit238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd (patch)
treecd8a1b75ba7b3543eb7fe6857f408e7be4d9fd0b /results/classifier/deepseek-r1:32b/reasoning/instruction/1780
parent96049c939b1916d80532630d63c14e04d5244f1d (diff)
downloademulator-bug-study-238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd.tar.gz
emulator-bug-study-238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd.zip
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+<think>
+Okay, so I'm trying to classify this bug report about the PowerPC mishandling the xscmpudp instruction. Let's break it down step by step.
+
+First, the problem description says that the xscmpudp instruction is being mishandled. The user provided a program where they're using f64::NAN and clamping it between two 0f64 values. They expect the result to be NaN, but when compiled with VSX enabled, the assertion fails. Without VSX, it works fine because it uses fcmpu instead.
+
+So, what's xscmpudp? I recall that in PowerPC, especially when using VSX (Vector Scalar eXtensions), certain instructions are used for vector operations. xscmpudp is probably one of those. The issue here seems to be that QEMU isn't handling this instruction correctly when it's emitted by the compiler with VSX enabled.
+
+The program uses clamp on a NaN value. Clamp should return NaN if either argument is NaN, so the assertion expects is_nan() to be true. But when xscmpudp is used (with VSX), it fails, implying QEMU isn't executing that instruction as expected.
+
+Looking at the categories: instruction, syscall, runtime. This seems related to how an instruction is handled by the emulator. Since the problem arises specifically with the use of xscmpudp and not when using fcmpu, it points towards a problem with the instruction handling in QEMU.
+
+So, I think this bug falls under the "instruction" category because it's about how a specific instruction (xscmpudp) is being mishandled by QEMU.
+</think>
+
+The issue involves incorrect handling of an instruction by QEMU.
+
+instruction
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