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v0.2
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Signed-off-by: zhuchen <[email protected]>
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zhuchen committed Dec 12, 2024
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Expand Up @@ -34,3 +34,7 @@ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
- **v0.1**

* Initial version

- **0.2**

* added content related to vector compilation.
2 changes: 1 addition & 1 deletion VERSION
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Software Development and Build Convention for LoongArch™ Architectures, version 0.10
Software Development and Build Convention for LoongArch™ Architectures, version 0.20
29 changes: 21 additions & 8 deletions la-softdev-convention.adoc
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= Software Development and Build Convention for LoongArch Architectures
Version 0.1
Copyright © Loongson Technology 2023. All rights reserved.
Version 0.2
Copyright © Loongson Technology 2024. All rights reserved.
:title-page:
:doctype: article
:toc: left
:sectnums:


== Abstract

This document is a comprehensive guide to software development and building convention for LoongArch Architecture Chips.
Expand All @@ -17,6 +19,8 @@ LoongArch chip features, Software development, Compiler constraints, Kernel cons

- **0.1**
* initial version.
- **0.2**
* added content related to vector compilation.

== Introduction

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| `\\__loongarch__` | `1` | Target architecture is LoongArch
| `__loongarch_grlen` | `64` `32` | Bit-width of GPR
| `__loongarch_frlen` | `0` `32` `64` | Bit-width of FPR (`0` if no FPU)
| `__loongarch_arch` | `"loongarch64"` `"la464"` | Target CPU name specified by `-march`. If not specified, defaults to the compiler-defined default. If `-march=native` is specified, then it is automatically detected by the compiler
| `__loongarch_arch` | `"loongarch64"` `"la464"` `"la64v1.0"` `"la64v1.1"` | Target CPU name specified by `-march`. If not specified, defaults to the compiler-defined default. If `-march=native` is specified, then it is automatically detected by the compiler
| `__loongarch_tune` | `"loongarch64"` `"la464"` | Target CPU name specified by `-mtune`. If not specified, it defaults to the same as `__loongarch_arch`. If `-mtune=native` is specified, then it is automatically detected by the compiler
| `__loongarch_lp64` | Undefined or `1` | ABI uses 64-bit GPR for parameter passing and follows LP64 data model
| `__loongarch_hard_float` | Undefined or `1` | ABI uses FPR for parameter passing
Expand All @@ -119,14 +123,17 @@ link:https://github.com/loongson/LoongArch-Documentation/blob/main/docs/LoongArc
| `__loongarch_double_float` | Undefined or `1` | ABI uses 64-bit FPR for parameter passing
|========================================================================================================================================================================================================================================================================

=== Debian Multiarch Identifiers (Convention Target Triplet)
=== LoongArch Multiarch Identifiers (Convention Target Triplet)

[options="header"]
|======================================================================
| ABI Type | C Library | Kernel | Multiarch Identifier
| lp64d / base | glibc | Linux | loongarch64-linux-gnu
| lp64f / base | glibc | Linux | loongarch64-linux-gnuf32
| lp64s / base | glibc | Linux | loongarch64-linux-gnusf
| lp64s / base | glibc | Linux | loongarch64-linux-gnusf
| lp64d / base | musl libc | Linux | loongarch64-linux-musl
| lp64f / base | musl libc | Linux | loongarch64-linux-muslf32
| lp64s / base | musl libc | Linux | loongarch64-linux-muslsf
|======================================================================

== Kernel Constraints
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=== Desktop and Server Operating System Build Requirements

Desktop operating systems need to support CPU platforms with at least 128-bit vector units.
Desktop and server operating operating systems both need to support CPU platforms with at least 128-bit vector units.

To support 128-bit vector instructions, the compilation toolchain should use the -march=la64v1.0 compilation option when compiling desktop and server operating systems.

The desktop operating system compilation toolchain should enable the -mno-strict-align compilation option by default and disable auto-vectorization.
When the toolchain does not support the -march=la64v1.0 compilation option, the compilation toolchain should use -march=loongarch64 as the default compilation option to compile desktop or server operating systems. The compilation toolchain does not support vector instructions when the -march=loongarch64 option is used.

The desktop and server operating system compilation toolchain should enable -mno-strict-align compilation option.

=== Embedded Operating System Requirements

Embedded operating systems need to support CPU platforms without vector units.

The embedded operating system compilation toolchain should enable the -mstrict-align compilation option by default and disable auto-vectorization.
Developers should use the -march=loongarch64 compilation option when compiling a 64-bit embedded operating system.

The embedded operating system compilation toolchain should enable the -mstrict-align compilation option by default.


== Compatibility Requirements for Software Development
Expand Down

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