Answer to: Disassembly of VCVTSD2USI in 16bit mode

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Answered: Apr 7, 2026

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I've thrown together a small test to see which one it is. Bochs decodes 62 F1 7F 08 79 C0 as VCVTSD2USI EAX, XMM0 and emulates it accordingly. I also checked with qemu-system-i386 -enable-kvm -cpu max to hopefully execute the instruction on my physical Ryzen cpu with the same result. So everything including the docs says its EAX.

assembly intel x86-16 avx512 x64dbg

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Disassembly of VCVTSD2USI in 16bit mode

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