Add intrinsic code generator for LoongArch

Co-authored-by: WANG Rui <wangrui@loongson.cn>

Author: 2 people

.gitignore

@@ -4,5 +4,7 @@ target
 tags
 crates/stdarch-gen-arm/aarch64.rs
 crates/stdarch-gen-arm/arm.rs
+crates/stdarch-gen-loongarch/lasx.c
+crates/stdarch-gen-loongarch/lsx.c
 c_programs/*
-rust_programs/*
+rust_programs/*

Cargo.toml

@@ -5,6 +5,7 @@ members = [
   "crates/core_arch",
   "crates/std_detect",
   "crates/stdarch-gen-arm",
+  "crates/stdarch-gen-loongarch",
   "crates/intrinsic-test",
   "examples/"
 ]

crates/stdarch-gen-loongarch/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "stdarch-gen-loongarch"
+version = "0.1.0"
+authors = ["ZHAI Xiang <zhaixiang@loongson.cn>", "WANG Rui <wangrui@loongson.cn>"]
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.8.5"

crates/stdarch-gen-loongarch/README.md

@@ -0,0 +1,33 @@
+# LoongArch LSX/LASX intrinsic code generator
+
+A small tool that allows to quickly generate intrinsics for the LoongArch LSX/LASX architectures.
+
+The specification for the intrinsics can be found in `lsx.spec` or `lasx.spec`.
+
+To run and re-generate the code run the following from the root of the `stdarch` crate.
+
+LSX:
+```
+# Generate bindings
+OUT_DIR=`pwd`/crates/stdarch-gen-loongarch cargo run -p stdarch-gen-loongarch -- crates/stdarch-gen-loongarch/lsxintrin.h
+OUT_DIR=`pwd`/crates/core_arch cargo run -p stdarch-gen-loongarch -- crates/stdarch-gen-loongarch/lsx.spec
+
+# Generate tests
+OUT_DIR=`pwd`/crates/stdarch-gen-loongarch cargo run -p stdarch-gen-loongarch -- crates/stdarch-gen-loongarch/lsx.spec test
+loongarch64-unknown-linux-gnu-gcc -static -o lsx crates/stdarch-gen-loongarch/lsx.c -mlasx
+qemu-loongarch64 ./lsx > crates/core_arch/src/loongarch64/lsx/tests.rs
+rustfmt crates/core_arch/src/loongarch64/lsx/tests.rs
+```
+
+LASX:
+```
+# Generate bindings
+OUT_DIR=`pwd`/crates/stdarch-gen-loongarch cargo run -p stdarch-gen-loongarch -- crates/stdarch-gen-loongarch/lasxintrin.h
+OUT_DIR=`pwd`/crates/core_arch cargo run -p stdarch-gen-loongarch -- crates/stdarch-gen-loongarch/lasx.spec
+
+# Generate tests
+OUT_DIR=`pwd`/crates/stdarch-gen-loongarch cargo run -p stdarch-gen-loongarch -- crates/stdarch-gen-loongarch/lasx.spec test
+loongarch64-unknown-linux-gnu-gcc -static -o lasx crates/stdarch-gen-loongarch/lasx.c -mlasx
+qemu-loongarch64 ./lasx > crates/core_arch/src/loongarch64/lasx/tests.rs
+rustfmt crates/core_arch/src/loongarch64/lasx/tests.rs
+```