Use x86_no_sse configuration in more places

Emit `x86_no_sse` in the compiler-builtins (and builtins-test) build
script, and use it to simplify `all(target_arch = "x86",
not(target_fefature = "sse))` configuration.

library/compiler-builtins/builtins-test/src/bench.rs

@@ -43,9 +43,7 @@ pub fn skip_sys_checks(test_name: &str) -> bool {
         return true;
     }
 
-    if cfg!(all(target_arch = "x86", not(target_feature = "sse")))
-        && X86_NO_SSE_SKIPPED.contains(&test_name)
-    {
+    if cfg!(x86_no_sse) && X86_NO_SSE_SKIPPED.contains(&test_name) {
         return true;
     }
 

library/compiler-builtins/builtins-test/tests/addsub.rs

@@ -111,7 +111,7 @@ macro_rules! float_sum {
     }
 }
 
-#[cfg(not(all(target_arch = "x86", not(target_feature = "sse"))))]
+#[cfg(not(x86_no_sse))]
 mod float_addsub {
     use super::*;
 
@@ -122,7 +122,7 @@ mod float_addsub {
 }
 
 #[cfg(f128_enabled)]
-#[cfg(not(all(target_arch = "x86", not(target_feature = "sse"))))]
+#[cfg(not(x86_no_sse))]
 #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
 mod float_addsub_f128 {
     use super::*;

library/compiler-builtins/builtins-test/tests/div_rem.rs

@@ -138,7 +138,7 @@ macro_rules! float {
     };
 }
 
-#[cfg(not(all(target_arch = "x86", not(target_feature = "sse"))))]
+#[cfg(not(x86_no_sse))]
 mod float_div {
     use super::*;
 

library/compiler-builtins/builtins-test/tests/float_pow.rs

@@ -1,7 +1,7 @@
 #![allow(unused_macros)]
 #![cfg_attr(f128_enabled, feature(f128))]
-#![cfg(not(all(target_arch = "x86", not(target_feature = "sse"))))]
 
+#[cfg_attr(x86_no_sse, allow(unused))]
 use builtins_test::*;
 
 // This is approximate because of issues related to
@@ -52,6 +52,7 @@ macro_rules! pow {
     };
 }
 
+#[cfg(not(x86_no_sse))] // FIXME(i586): failure for powidf2
 pow! {
     f32, 1e-4, __powisf2, all();
     f64, 1e-12, __powidf2, all();

library/compiler-builtins/builtins-test/tests/mul.rs

@@ -113,7 +113,7 @@ macro_rules! float_mul {
     };
 }
 
-#[cfg(not(all(target_arch = "x86", not(target_feature = "sse"))))]
+#[cfg(not(x86_no_sse))]
 mod float_mul {
     use super::*;
 
@@ -126,7 +126,7 @@ mod float_mul {
 }
 
 #[cfg(f128_enabled)]
-#[cfg(not(all(target_arch = "x86", not(target_feature = "sse"))))]
+#[cfg(not(x86_no_sse))]
 #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
 mod float_mul_f128 {
     use super::*;

library/compiler-builtins/compiler-builtins/build.rs

@@ -106,13 +106,6 @@ fn configure_libm(target: &Target) {
         println!("cargo:rustc-cfg=optimizations_enabled");
     }
 
-    // Config shorthands
-    println!("cargo:rustc-check-cfg=cfg(x86_no_sse)");
-    if target.arch == "x86" && !target.features.iter().any(|f| f == "sse") {
-        // Shorthand to detect i586 targets
-        println!("cargo:rustc-cfg=x86_no_sse");
-    }
-
     println!(
         "cargo:rustc-env=CFG_CARGO_FEATURES={:?}",
         target.cargo_features

library/compiler-builtins/compiler-builtins/configure.rs

@@ -100,6 +100,13 @@ pub fn configure_aliases(target: &Target) {
         println!("cargo:rustc-cfg=thumb_1")
     }
 
+    // Config shorthands
+    println!("cargo:rustc-check-cfg=cfg(x86_no_sse)");
+    if target.arch == "x86" && !target.features.iter().any(|f| f == "sse") {
+        // Shorthand to detect i586 targets
+        println!("cargo:rustc-cfg=x86_no_sse");
+    }
+
     /* Not all backends support `f16` and `f128` to the same level on all architectures, so we
      * need to disable things if the compiler may crash. See configuration at:
      * * https://github.com/rust-lang/rust/blob/c65dccabacdfd6c8a7f7439eba13422fdd89b91e/compiler/rustc_codegen_llvm/src/llvm_util.rs#L367-L432

library/compiler-builtins/libm/src/math/rem_pio2.rs

@@ -195,7 +195,7 @@ mod tests {
 
     #[test]
     // FIXME(correctness): inaccurate results on i586
-    #[cfg_attr(all(target_arch = "x86", not(target_feature = "sse")), ignore)]
+    #[cfg_attr(x86_no_sse, ignore)]
     fn test_near_pi() {
         let arg = 3.141592025756836;
         let arg = force_eval!(arg);