CI: Build for non-SSE target

.github/workflows/ci.yml

@@ -129,6 +129,23 @@ jobs:
       name: Run benchmarks as tests
       run: cargo bench --manifest-path bench/Cargo.toml --verbose -- --test
 
+  build-for-non_sse-target:
+    name: build for non-SSE target
+    runs-on: ubuntu-18.04
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v1
+      with:
+        fetch-depth: 1
+    - name: Install Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: nightly
+        profile: minimal
+        override: true
+        components: rust-src
+    - run: cargo build -Z build-std=core --target=src/tests/x86_64-soft_float.json --verbose --no-default-features
+
   test-with-miri:
     name: test with miri
     runs-on: ubuntu-18.04

src/tests/x86_64-soft_float.json

@@ -0,0 +1,15 @@
+{
+    "llvm-target": "x86_64-unknown-none",
+    "target-endian": "little",
+    "target-pointer-width": "64",
+    "target-c-int-width": "32",
+    "os": "none",
+    "arch": "x86_64",
+    "data-layout": "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128",
+    "linker-flavor": "ld.lld",
+    "linker": "rust-lld",
+    "features": "-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-3dnow,-3dnowa,-avx,-avx2,+soft-float",
+    "executables": true,
+    "disable-redzone": true,
+    "panic-strategy": "abort"
+}