# LLVM Analysis of the Differences Between AMD GFX1250 and GFX1251

DevFeed: [LLVM Analysis of the Differences Between AMD GFX1250 and GFX1251](<https://devfeed.tech/articles/llvm-divination-of-gfx1251-s-differences-14000.md>)

Original publisher: [Read original article](<https://chipsandcheese.com/p/llvm-divination-of-gfx1251s-differences>)

Author: George Cozma

Published: 2026-07-20T09:23:59Z

Content type: article

Language: en

Sources: [Chips and Cheese](<https://devfeed.tech/sources/chips-and-cheese.md>)

Topics: [LLVM](<https://devfeed.tech/topics/llvm.md>), [Compiler](<https://devfeed.tech/topics/compiler.md>), [Hardware](<https://devfeed.tech/topics/hardware.md>)

Tags: [compiler](<https://devfeed.tech/tags/compiler.md>), [hardware](<https://devfeed.tech/tags/hardware.md>), [llvm](<https://devfeed.tech/tags/llvm.md>), [math](<https://devfeed.tech/tags/math.md>), [memory](<https://devfeed.tech/tags/memory.md>), [vector](<https://devfeed.tech/tags/vector.md>)

## AI overview

The article examines LLVM target descriptions for AMD GFX1250 and GFX1251, identifying their shared GFX12.5 features and differences. It focuses on GFX1251's improved 64-bit execution, packed FP64 and U64 instructions, and the compiler cost model's support for those operations.

## Source excerpt

Hello you fine Internet folks, this article is a sequel to the Scrying the AMD GFX1250 LLVM Tea Leaves article where we are going to look at the differences between GFX1250 and GFX1251.