unguard for sse4.2 to allow rust to polyfill on older platforms

Author: Licenser

.drone.yml

@@ -12,7 +12,6 @@ steps:
   commands:
   - cargo build --verbose --all
   - cargo test --verbose --all
-
 ---
 
 kind: pipeline
@@ -32,6 +31,23 @@ steps:
 
 ---
 
+kind: pipeline
+name: test-on-pre-sse42
+
+platform:
+  arch: amd64
+
+steps:
+- name: test
+  image: rust:1
+  environment:
+    RUSTFLAGS: '-C target-cpu=native -C target-feature=-avx2,-sse4.2'
+  commands:
+  - cargo build --verbose --all
+  - cargo test --verbose --all
+
+---
+
 kind: pipeline
 name: test-on-arm64
 

src/lib.rs

@@ -89,11 +89,11 @@ pub use crate::avx2::deser::*;
 #[cfg(target_feature = "avx2")]
 use crate::avx2::stage1::SIMDJSON_PADDING;
 
-#[cfg(all(target_feature = "sse4.2", not(target_feature = "avx2")))]
+#[cfg(not(target_feature = "avx2"))]
 mod sse42;
-#[cfg(all(target_feature = "sse4.2", not(target_feature = "avx2")))]
+#[cfg(not(target_feature = "avx2"))]
 pub use crate::sse42::deser::*;
-#[cfg(all(target_feature = "sse4.2", not(target_feature = "avx2")))]
+#[cfg(not(target_feature = "avx2"))]
 use crate::sse42::stage1::SIMDJSON_PADDING;
 
 mod stage2;

src/stage2.rs

@@ -2,7 +2,7 @@
 #[cfg(target_feature = "avx2")]
 use crate::avx2::stage1::SIMDJSON_PADDING;
 use crate::charutils::*;
-#[cfg(all(target_feature = "sse4.2", not(target_feature = "avx2")))]
+#[cfg(not(target_feature = "avx2"))]
 use crate::sse42::stage1::SIMDJSON_PADDING;
 use crate::{Deserializer, Error, ErrorType, Result};