Mojo module

mxfp4_matmul_amd

MXFP4 matmul on AMD CDNA GPUs via dequant-to-FP8 + FP8 GEMM.

Dequantizes MXFP4 weights to FP8, casts BF16 activations to FP8, then dispatches to the AMD FP8 GEMM via _matmul_gpu.

MI355X (CDNA4) uses float8_e4m3fn; MI300X (CDNA3) uses float8_e4m3fnuz. The FP8 type is selected at compile time based on the target architecture.

Functions

• ​mxfp4_matmul_amd: MXFP4 matmul: dequant B weights to FP8, cast A to FP8, AMD FP8 GEMM.

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