impl VectorMax/Min for vector_float/double

these implementations work with just the vector target feature, but they only get a dedicated instruction in vector-enhancements-1

Author: folkertdev

Diff for: crates/core_arch/src/s390x/macros.rs

@@ -2,6 +2,13 @@
 #![allow(unused_imports)] // FIXME remove when more tests are added
 
 macro_rules! test_impl {
+    ($fun:ident ($($v:ident : $ty:ty),*) -> $r:ty [$call:ident, _]) => {
+        #[inline]
+        #[target_feature(enable = "vector")]
+        pub unsafe fn $fun ($($v : $ty),*) -> $r {
+            $call ($($v),*)
+        }
+    };
     ($fun:ident +($($v:ident : $ty:ty),*) -> $r:ty [$call:ident, $instr:ident]) => {
         #[inline]
         #[target_feature(enable = "vector")]

Diff for: crates/core_arch/src/s390x/vector.rs

@@ -330,6 +330,13 @@ mod sealed {
 
     impl_vec_trait! { [VectorMax vec_max] ~(vmxlb, vmxb, vmxlh, vmxh, vmxlf, vmxf, vmxlg, vmxg) }
 
+    // FIXME(vector-enhancements-1) test for the `vfmaxsb` etc. instruction
+    test_impl! { vec_vfmaxsb (a: vector_float, b: vector_float) -> vector_float [simd_fmax, _] }
+    test_impl! { vec_vfmaxdb (a: vector_double, b: vector_double) -> vector_double [simd_fmax, _] }
+
+    impl_vec_trait!([VectorMax vec_max] vec_vfmaxsb (vector_float, vector_float) -> vector_float);
+    impl_vec_trait!([VectorMax vec_max] vec_vfmaxdb (vector_double, vector_double) -> vector_double);
+
     #[unstable(feature = "stdarch_s390x", issue = "135681")]
     pub trait VectorMin<Other> {
         type Result;
@@ -348,6 +355,13 @@ mod sealed {
 
     impl_vec_trait! { [VectorMin vec_min] ~(vmxlb, vmxb, vmxlh, vmxh, vmxlf, vmxf, vmxlg, vmxg) }
 
+    // FIXME(vector-enhancements-1) test for the `vfminsb` etc. instruction
+    test_impl! { vec_vfminsb (a: vector_float, b: vector_float) -> vector_float [simd_fmin, _] }
+    test_impl! { vec_vfmindb (a: vector_double, b: vector_double) -> vector_double [simd_fmin, _] }
+
+    impl_vec_trait!([VectorMin vec_min] vec_vfminsb (vector_float, vector_float) -> vector_float);
+    impl_vec_trait!([VectorMin vec_min] vec_vfmindb (vector_double, vector_double) -> vector_double);
+
     #[unstable(feature = "stdarch_s390x", issue = "135681")]
     pub trait VectorAbs {
         unsafe fn vec_abs(self) -> Self;