feat(concrete-cpu): m1 support

.github/workflows/concrete_cpu_test.yml

@@ -7,7 +7,7 @@ on:
 env:
   CARGO_TERM_COLOR: always
 jobs:
-  tests:
+  tests-linux:
     runs-on: ubuntu-20.04
     env:
       RUSTFLAGS: -D warnings
@@ -60,3 +60,63 @@ jobs:
         run: |
           cd backends/concrete-cpu/test
           make test
+
+  tests-mac_x86:
+    runs-on: macos-11
+    env:
+      RUSTFLAGS: -D warnings
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Rust install
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+
+      - name: Download cargo cache
+        uses: Swatinem/rust-cache@v2
+
+      - name: Tests
+        run: |
+          cd backends/concrete-cpu
+          cargo test --no-fail-fast --all-targets
+
+      - name: Zig install
+        run: |
+          brew install zig
+
+      - name: Zig test
+        run: |
+          cd backends/concrete-cpu/test
+          make test
+
+
+  tests-mac-m1:
+    runs-on: m1mac
+    env:
+      RUSTFLAGS: -D warnings
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Rust install
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          override: true
+
+      - name: Download cargo cache
+        uses: Swatinem/rust-cache@v2
+
+      - name: Tests
+        run: |
+          cd backends/concrete-cpu
+          cargo test --no-fail-fast --all-targets
+
+      - name: Zig install
+        run: |
+          brew install zig
+
+      - name: Zig test
+        run: |
+          cd backends/concrete-cpu/test
+          make test

backends/concrete-cpu/src/c_api/csprng.rs

@@ -68,6 +68,7 @@ pub unsafe extern "C" fn concrete_cpu_destroy_concrete_csprng(mem: *mut Csprng)
 // Returns 1 if the random is crypto secure, -1 if it not secure, 0 if fail.
 #[no_mangle]
 pub unsafe extern "C" fn concrete_cpu_crypto_secure_random_128(u128: *mut Uint128) -> c_int {
+    #[cfg(any(target_arch = "x86_64", target_arch = "x86"))]
     if is_x86_feature_detected!("rdseed") {
         let mut rand: u64 = 0;
         loop {

backends/concrete-cpu/src/implementation/convert/mod.rs

@@ -10,6 +10,7 @@ use core::mem::MaybeUninit;
 use dyn_stack::{DynStack, SizeOverflow, StackReq};
 use pulp::{as_arrays, as_arrays_mut};
 
+#[cfg(any(target_arch = "x86_64", target_arch = "x86"))]
 pub mod x86;
 
 fn convert_forward_integer_u64_scalar(