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More ISA Differences Come To Light With The New AMD GFX1170 "RDNA 4m"
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AMD again moves tab with RDNA 4m, an intermediate variant that starts with RDNA 3.5 and appears under the GFX1170 identifier in LLVM, where the reds make it clear that we are not facing a simple refrito, but rather towards an upgrade focused on AI. As seen in the AMDGPU backend, there are real changes in the ISA. For example, instructions oriented to matrix calculation are added and inherited parts that no longer fit the current approach are rem…
After RDNA 4m was discovered two weeks ago in a Linux patch for the free modular compiler system LLVM, further insights into the refresh architecture have now leaked through. Much is known for FSR 4 support.
More ISA Differences Come To Light With The New AMD GFX1170 "RDNA 4m"
Earlier this month we spotted the addition of a new GFX1170 GPU target in the AMDGPU LLVM back-end. Making this GFX1170 target interesting is that its marked as an APU/SoC part with "RDNA 4m" while being part of the GFX11 series. The GFX11 series is for RDNA3, GFX115x is for RDNA 3.5, and GFX12 is RDNA4. More ISA changes have now been committed to the AMDGPU LLVM back-end that make a few more instruction differences better aligned with RDNA4...
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