AMDGPU LLVM adds GFX1170 with new feature flags versus GFX115x
AMD has added a new graphics target, GFX1170, to the AMDGPU back end in the LLVM codebase. Phoronix first reported the change and noted the target is also labeled “ RDNA 4m .”
This ID was not know before, so it would fit between existing RDNA3 and RDNA4 families. Especially surprising given that AMD recently started enablement for GFX1251 (RDNA4 Refresh?) and the recently introduced GFX13 (RDNA5) target.
Phoronix says the LLVM enablement patch identifies GFX1170 as an APU/SoC target, not a discrete GPU target. The same report says GFX1170 adds the SALUFloatInsts and DPPSrc1SGPR feature flags versus the GFX115x targets, but does not include the full set of GFX12 ISA features associated with RDNA 4 GPUs.
Source: LLMV
RDNA4 or RDNA3.9?
The “RDNA 4m” naming is the confusing part. Phoronix points out that RDNA 4 has been tied to GFX12, so calling a GFX11.x target “RDNA 4m” looks like a naming choice rather than a clean generational jump. One possibility is that AMD is preparing an updated APU graphics IP that keeps a mostly GFX11-era baseline while adding a small set of newer ISA capabilities.
This could be a stretch, but perhaps we are looking at some kind of APU that will support FSR4, perhaps other features. Or maybe it’s just an updated chip with newer silicon but still based on the same design.
