What is Hackers' Pub?
Hackers' Pub is a place for software engineers to share their knowledge and experience with each other. It's also an ActivityPub-enabled social network, so you can follow your favorite hackers in the fediverse and get their latest posts in your feed.
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![3 ZU Indication
The only instructions that can use the ZU (zero-upper) indication are the SETcc instructions in EVEX map 4 and the IMUL instructions with opcodes 0x69 and 0x68 in EVEX map 4. The ZU indication is expressed as a suffix in the forms IMULZU and SETZUcc. (Note that “ZU” appears before the condition code in SETZUcc.) In the AT&T syntax, the “zu” should appear before the OSIZE modifier.
Intel syntax
imulzu ax, word ptr [rbx], 0xab
setzunz al
AT&T syntax
imulzuw %0xab, (%rbx), %ax
setzuneb %al](https://files.mastodon.social/media_attachments/files/115/792/442/417/581/780/original/8b8cb0ed429fa39a.png)
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