Integrated matrix extension#21
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joseemoreira merged 7 commits intoriscv:integrated-matrix-extensionfrom Mar 9, 2026
Merged
Integrated matrix extension#21joseemoreira merged 7 commits intoriscv:integrated-matrix-extensionfrom
joseemoreira merged 7 commits intoriscv:integrated-matrix-extensionfrom
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joseemoreira
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ptomsich
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Mar 9, 2026
* Extra tag to make image preview work * Updated SAIL for tile loads/stores when (rs2) == 0 * Separate order-preserving vs transposing tile loads/stores
ptomsich
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Mar 26, 2026
Process all 28 items from the IME TG internal review feedback tracker. Subextension dependencies (#3): Replace blanket Zve64d dependency with the minimum Zve subset per subextension: Zve32x for integer accumulators ≤ 32-bit, Zve64x for Int64 accumulators, Zve32f for FP accumulators ≤ 32-bit, and Zve64d only for FP64 accumulators. 8× widening instructions (#7, #8, #9, #24): Add v8wmmacc.vv (funct6=0x3b, OPIVV), vf8wmmacc.vv (funct6=0x17, OPFVV), and vf8wimmacc.vv (integer-input MX variant, vm=0 of v8wmmacc) with full instruction definitions, SAIL pseudocode, encoding diagrams, and exception tables. Update encoding maps (FP, integer, integer MX) with W=8 entries. Add Zvvxi4fp32mm and Zvvxni4fp32mm to the MX subextension table. Replace the informative NOTE about reserved W=8 encoding space with normative text. Remove the undefined term "octal-widening". MXINT4 clarification and OCP citation (#14): Define MXINT4 as analogous to OCP MX's MXINT8 but with 4-bit signed elements. Add proper citation of the OCP Microscaling Formats (MX) v1.0 Specification with URL. Update microscaling applicability to include vf8wmmacc.vv. vfmmacc.vv vm=0 cleanup (#13, #28): Remove contradictory "When vm=0" exception bullets (vm=0 is reserved for non-widening FP). Replace dead microscaling SAIL code with a straightforward non-widening FP GEMM loop. Add explicit note that microscaling is not supported for non-widening multiply-accumulate. Terminology fixes (#15, #21): Add forward cross-reference at first use of altfmt_A/altfmt_B. Correct two occurrences where λ was described as "the K dimension" to "tile-layout parameter", clarifying that K_eff = λ × W × LMUL is the derived effective K dimension.
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Separated order-preserving and transposing tile loads/stores.