Browse Extensions

xthead-fmemidx

1.0.0.xsil package

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.

This versioned archive records the Extension's encoding, dependencies, provenance, documentation, and any simulator, toolchain, RTL, test, or hardware support declared by its maintainer.

Package metadata

Metadata is published by the package maintainer. Inspect the archive, upstream sources, and checksums before depending on declared support.

Required ISA
RV64IFD_Xtheadfmemidx
Declared support
spike
Toolchain
riscv64-unknown-elf · v14.2.0 (external)
Capabilities
ISAToolchain: externalSim: SpikeTestsRepro: host-dependententrytestEntry
Resolution
host-dependent
Archive checksum
sha256:1c8e98ce4f8266adef97ce64050fc38fc72f22b8c38653fd55665bc2985eee7a
Payload checksum
sha256:e5834e25199a649479ff643e6f768e4d962d04f4ccd5f464f07ff9da31135e8b
Support metadata
{
  "spike": {
    "config": "sim/spike.yaml",
    "isa": "rv64gc_xtheadfmemidx",
    "mem": "256m",
    "priv": "msu",
    "status": "skeleton"
  }
}
Dependencies
{
  "tools": []
}

README

T-Head XTheadFMemIdx floating-point indexed memory operations

Version History

VersionPublishedStatus
1.0.0latest
xsil install [email protected]
May 14, 2026active

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07-1307-2007-2708-0308-1008-11

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1.0.0
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