Run stdarch tests in the CI

.github/workflows/release.yml

@@ -105,3 +105,8 @@ jobs:
     - name: Run tests
       run: |
         ./test.sh --release --clean --release-sysroot --build-sysroot --mini-tests --std-tests # --test-libcore # FIXME(antoyo): libcore tests fail.
+
+    - name: Run stdarch tests
+      run: |
+        cd build_sysroot/sysroot_src/library/stdarch/
+        CHANNEL=release TARGET=x86_64-unknown-linux-gnu ../../../../cargo.sh test

patches/0001-Disable-examples.patch

@@ -0,0 +1,25 @@
+From a2d53a324a02c04b76c0e9d39dc15cd443a3b8b2 Mon Sep 17 00:00:00 2001
+From: Antoni Boucher <[email protected]>
+Date: Fri, 25 Nov 2022 11:18:11 -0500
+Subject: [PATCH] Disable examples
+
+---
+ library/stdarch/Cargo.toml | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/library/stdarch/Cargo.toml b/library/stdarch/Cargo.toml
+index fbe0a95..748d72d 100644
+--- a/library/stdarch/Cargo.toml
++++ b/library/stdarch/Cargo.toml
+@@ -3,7 +3,7 @@ members = [
+   "crates/core_arch",
+   "crates/std_detect",
+   "crates/stdarch-gen",
+-  "examples/"
++  #"examples/"
+ ]
+ exclude = [
+   "crates/wasm-assert-instr-tests"
+-- 
+2.26.2.7.g19db9cfb68.dirty
+

src/base.rs

@@ -101,7 +101,7 @@ pub fn compile_codegen_unit<'tcx>(tcx: TyCtxt<'tcx>, cgu_name: Symbol, supports_
         context.add_command_line_option("-m64");
         context.add_command_line_option("-mbmi");
         context.add_command_line_option("-mgfni");
-        context.add_command_line_option("-mavxvnni");
+        //context.add_command_line_option("-mavxvnni"); // The CI doesn't support this option.
         context.add_command_line_option("-mf16c");
         context.add_command_line_option("-maes");
         context.add_command_line_option("-mxsavec");

src/lib.rs

@@ -316,7 +316,8 @@ pub fn target_features(sess: &Session, allow_unstable: bool) -> Vec<Symbol> {
             // gcc -march=native -Q --help=target
             #[cfg(feature="master")]
             {
-                (_feature.contains("sse") || _feature.contains("avx")) && !_feature.contains("avx512")
+                // NOTE: the CPU in the CI doesn't support sse4a, so disable it to make the stdarch tests pass in the CI.
+                (_feature.contains("sse") || _feature.contains("avx")) && !_feature.contains("avx512") && !_feature.contains("sse4a")
             }
             #[cfg(not(feature="master"))]
             {