xthead-fmemidx

1.0.0Readiness: RL1 — Packaged

by extensilica

T-Head XTheadFMemIdx floating-point indexed memory operations

No confirmed encoding conflictsShares encoding space with 11 extension(s)

Show encoding relation details

mojo-v INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-ba INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-bb INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-bs INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-condmov INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-fmv INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-int INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-mac INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-mempair INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-sync INFO

SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

xthead-vdot WARNING

PARTIAL_DECODE_OVERLAP: opcode 0x0B funct3 0x6 funct7 null — opcode and funct3 match, but the full mask isn't known (funct7/funct12 not imported). Possible overlap; needs full mask/match data to confirm.
SHARED_CUSTOM_SPACE: both declare custom-0; shared custom space (no per-vendor allocation in RISC-V). Not a conflict on its own — composing both needs opcode remapping or selective enable.

Pre-silicon bridge: this package is meant to be evaluable before RTL/FPGA/ASIC decisions.

Install

xsil install xthead-fmemidx

Run

xsil run xthead-fmemidx

Requires ISA RV64IFD_Xtheadfmemidx

Details

Published

May 14, 2026

Latest

1.0.0

Standard

Vendor

T-Head / XuanTie

Provenance

Seeded · unverified

Auto-published from upstream by the ExtenSilica catalog-seed agent. The original maintainer has not (yet) claimed authorship.

ISA

RV64IFD_Xtheadfmemidx

Readiness

Readiness: RL1 — Packaged

ISAToolchain: externalSim: SpikeTestsRepro: host-dependent

Toolchain

riscv64-unknown-elf · v14.2.0 (external)

Targets

spike

{
  "spike": {
    "config": "sim/spike.yaml",
    "isa": "rv64gc_xtheadfmemidx",
    "mem": "256m",
    "priv": "msu",
    "status": "skeleton"
  }
}

Cite

CFF and BibTeX for papers and Zenodo (v1.0.0).

CFF

cff-version: 1.2.0
type: software
title: xthead-fmemidx
version: 1.0.0
authors:
  - name: extensilica
abstract: T-Head XTheadFMemIdx floating-point indexed memory operations
message: "If you use this software, please cite it using the metadata from this file."
repository-code: https://github.com/XUANTIE-RV/thead-extension-spec
url: https://extensilica.com/package/xthead-fmemidx
date-released: 2026-05-14
identifiers:
  - type: url
    value: https://extensilica.com/package/xthead-fmemidx
  - type: url
    value: https://github.com/XUANTIE-RV/thead-extension-spec

BibTeX

@software{xthead_fmemidx_1_0_0,
  title = {xthead-fmemidx},
  author = {extensilica},
  year = {2026},
  version = {1.0.0},
  url = {https://extensilica.com/package/xthead-fmemidx},
  repository = {https://github.com/XUANTIE-RV/thead-extension-spec},
}

Downloads

7 days

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Maintainers

extensilica

Links

Repository

Implementation requests

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Readiness & capabilities

Readiness: RL1 — Packaged

Runnable (entry declared)

Testable (testEntry declared)

Repro: bundled

Repro: resolved

Repro: host-dependent

Toolchain: bundled

Toolchain: external

Sim: Spike

Emu: QEMU

RTL

FPGA

Tests

README

T-Head XTheadFMemIdx floating-point indexed memory operations

Version History

Version	Published	Size	Downloads	Status
1.0.0latest `xsil install [email protected]`	May 14, 2026	4.4 KB	4	active

Downloads

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Daily downloads — last 30 days

06-1506-2206-2907-0607-1307-14

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1.0.0

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