Add amdgpu intrinsics

Add intrinsics for the amdgpu architecture.

library/stdarch/.github/workflows/main.yml

@@ -84,6 +84,8 @@ jobs:
           os: ubuntu-latest
         - tuple: nvptx64-nvidia-cuda
           os: ubuntu-latest
+        - tuple: amdgcn-amd-amdhsa
+          os: ubuntu-latest
         - tuple: thumbv6m-none-eabi
           os: ubuntu-latest
         - tuple: thumbv7m-none-eabi
@@ -201,6 +203,10 @@ jobs:
             tuple: aarch64-apple-ios-macabi
             os: macos-15
           norun: true # https://github.com/rust-lang/stdarch/issues/1206
+        - target:
+            tuple: amdgcn-amd-amdhsa
+            os: ubuntu-latest
+          norun: true
 
     steps:
     - uses: actions/checkout@v4
@@ -212,12 +218,17 @@ jobs:
 
     - run: rustup target add ${{ matrix.target.tuple }}
       shell: bash
-      if: matrix.build_std == ''
+      if: matrix.build_std == '' && matrix.target.tuple != 'amdgcn-amd-amdhsa'
     - run: |
         rustup component add rust-src
         echo "CARGO_UNSTABLE_BUILD_STD=std" >> $GITHUB_ENV
       shell: bash
       if: matrix.build_std != ''
+    - run: |
+        rustup component add rust-src
+        echo "CARGO_UNSTABLE_BUILD_STD=core,alloc" >> $GITHUB_ENV
+      shell: bash
+      if: matrix.target.tuple == 'amdgcn-amd-amdhsa'
 
     # Configure some env vars based on matrix configuration
     - run: echo "PROFILE=--profile=${{matrix.profile}}" >> $GITHUB_ENV
@@ -233,7 +244,7 @@ jobs:
       if: matrix.disable_assert_instr != ''
     - run: echo "NOSTD=1" >> $GITHUB_ENV
       shell: bash
-      if: startsWith(matrix.target.tuple, 'thumb') || matrix.target.tuple == 'nvptx64-nvidia-cuda'
+      if: startsWith(matrix.target.tuple, 'thumb') || matrix.target.tuple == 'nvptx64-nvidia-cuda' || matrix.target.tuple == 'amdgcn-amd-amdhsa'
 
     # Windows & OSX go straight to `run.sh` ...
     - run: ./ci/run.sh

library/stdarch/ci/docker/amdgcn-amd-amdhsa/Dockerfile

@@ -0,0 +1,5 @@
+FROM ubuntu:25.10
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  gcc \
+  libc6-dev \
+  ca-certificates

library/stdarch/ci/dox.sh

@@ -15,6 +15,15 @@ dox() {
 
   cargo clean --target "${1}"
 
+  if [ "${1}" == "amdgcn-amd-amdhsa" ]; then
+    if [ "$CI" != "" ]; then
+      rustup component add rust-src
+    fi
+    export CARGO_UNSTABLE_BUILD_STD=core
+    # amdgpu needs a target-cpu, any is fine
+    export RUSTFLAGS="${RUSTFLAGS} -Ctarget-cpu=gfx900"
+  fi
+
   cargo build --verbose --target "${1}" --manifest-path crates/core_arch/Cargo.toml
   cargo doc --verbose --target "${1}" --manifest-path crates/core_arch/Cargo.toml
 }
@@ -33,6 +42,7 @@ if [ -z "$1" ]; then
   #dox mips64-unknown-linux-gnuabi64
   dox wasm32-unknown-unknown
   dox nvptx64-nvidia-cuda
+  dox amdgcn-amd-amdhsa
 else
   dox "${1}"
 fi

library/stdarch/ci/run.sh

@@ -42,6 +42,9 @@ case ${TARGET} in
     armv7-*eabihf | thumbv7-*eabihf)
         export RUSTFLAGS="${RUSTFLAGS} -Ctarget-feature=+neon"
         ;;
+    amdgcn-*)
+        export RUSTFLAGS="${RUSTFLAGS} -Ctarget-cpu=gfx1200"
+        ;;
     # Some of our test dependencies use the deprecated `gcc` crates which
     # doesn't detect RISC-V compilers automatically, so do it manually here.
     riscv*)

library/stdarch/crates/core_arch/src/core_arch_docs.md

@@ -185,6 +185,7 @@ others at:
 * [`x86_64`]
 * [`arm`]
 * [`aarch64`]
+* [`amdgpu`]
 * [`riscv32`]
 * [`riscv64`]
 * [`mips`]
@@ -201,6 +202,7 @@ others at:
 [`x86_64`]: ../../core/arch/x86_64/index.html
 [`arm`]: ../../core/arch/arm/index.html
 [`aarch64`]: ../../core/arch/aarch64/index.html
+[`amdgpu`]: ../../core/arch/amdgpu/index.html
 [`riscv32`]: ../../core/arch/riscv32/index.html
 [`riscv64`]: ../../core/arch/riscv64/index.html
 [`mips`]: ../../core/arch/mips/index.html

library/stdarch/crates/core_arch/src/mod.rs

@@ -274,6 +274,16 @@ pub mod arch {
         pub use crate::core_arch::nvptx::*;
     }
 
+    /// Platform-specific intrinsics for the `amdgpu` platform.
+    ///
+    /// See the [module documentation](../index.html) for more details.
+    #[cfg(any(target_arch = "amdgpu", doc))]
+    #[doc(cfg(target_arch = "amdgpu"))]
+    #[unstable(feature = "stdarch_amdgpu", issue = "149988")]
+    pub mod amdgpu {
+        pub use crate::core_arch::amdgpu::*;
+    }
+
     /// Platform-specific intrinsics for the `loongarch32` platform.
     ///
     /// See the [module documentation](../index.html) for more details.
@@ -349,6 +359,10 @@ mod powerpc64;
 #[doc(cfg(target_arch = "nvptx64"))]
 mod nvptx;
 
+#[cfg(any(target_arch = "amdgpu", doc))]
+#[doc(cfg(target_arch = "amdgpu"))]
+mod amdgpu;
+
 #[cfg(any(target_arch = "loongarch32", doc))]
 #[doc(cfg(target_arch = "loongarch32"))]
 mod loongarch32;