Implement floating point SIMD intrinsics over all vector widths, and limit SIMD vector lengths.

src/test/ui/simd-type-generic-monomorphisation-empty.rs

@@ -0,0 +1,12 @@
+// build-fail
+
+#![feature(repr_simd, platform_intrinsics)]
+
+// error-pattern:monomorphising SIMD type `Simd<0_usize>` of zero length
+
+#[repr(simd)]
+struct Simd<const N: usize>([f32; N]);
+
+fn main() {
+    let _ = Simd::<0>([]);
+}

src/test/ui/simd-type-generic-monomorphisation-empty.stderr

@@ -0,0 +1,4 @@
+error: monomorphising SIMD type `Simd<0_usize>` of zero length
+
+error: aborting due to previous error
+

src/test/ui/simd-type-generic-monomorphisation-oversized.rs

@@ -0,0 +1,12 @@
+// build-fail
+
+#![feature(repr_simd, platform_intrinsics)]
+
+// error-pattern:monomorphising SIMD type `Simd<65537_usize>` of length greater than 65536
+
+#[repr(simd)]
+struct Simd<const N: usize>([f32; N]);
+
+fn main() {
+    let _ = Simd::<65537>([0.; 65537]);
+}

src/test/ui/simd-type-generic-monomorphisation-oversized.stderr

@@ -0,0 +1,4 @@
+error: monomorphising SIMD type `Simd<65537_usize>` of length greater than 65536
+
+error: aborting due to previous error
+

src/test/ui/simd-type.rs

@@ -6,6 +6,9 @@
 #[repr(simd)]
 struct empty; //~ ERROR SIMD vector cannot be empty
 
+#[repr(simd)]
+struct empty2([f32; 0]); //~ ERROR SIMD vector cannot be empty
+
 #[repr(simd)]
 struct i64f64(i64, f64); //~ ERROR SIMD vector should be homogeneous
 
@@ -17,4 +20,10 @@ struct FooV(Foo, Foo); //~ ERROR SIMD vector element type should be a primitive
 #[repr(simd)]
 struct FooV2([Foo; 2]); //~ ERROR SIMD vector element type should be a primitive scalar (integer/float/pointer) type
 
+#[repr(simd)]
+struct TooBig([f32; 65537]); //~ ERROR SIMD vector cannot have more than 65536 elements
+
+#[repr(simd)]
+struct JustRight([u128; 65536]);
+
 fn main() {}

src/test/ui/simd-type.stderr

@@ -4,25 +4,37 @@ error[E0075]: SIMD vector cannot be empty
 LL | struct empty;
    | ^^^^^^^^^^^^^
 
-error[E0076]: SIMD vector should be homogeneous
+error[E0075]: SIMD vector cannot be empty
   --> $DIR/simd-type.rs:10:1
    |
+LL | struct empty2([f32; 0]);
+   | ^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0076]: SIMD vector should be homogeneous
+  --> $DIR/simd-type.rs:13:1
+   |
 LL | struct i64f64(i64, f64);
    | ^^^^^^^^^^^^^^^^^^^^^^^^ SIMD elements must have the same type
 
 error[E0077]: SIMD vector element type should be a primitive scalar (integer/float/pointer) type
-  --> $DIR/simd-type.rs:15:1
+  --> $DIR/simd-type.rs:18:1
    |
 LL | struct FooV(Foo, Foo);
    | ^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0077]: SIMD vector element type should be a primitive scalar (integer/float/pointer) type
-  --> $DIR/simd-type.rs:18:1
+  --> $DIR/simd-type.rs:21:1
    |
 LL | struct FooV2([Foo; 2]);
    | ^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 4 previous errors
+error[E0075]: SIMD vector cannot have more than 65536 elements
+  --> $DIR/simd-type.rs:24:1
+   |
+LL | struct TooBig([f32; 65537]);
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 6 previous errors
 
 Some errors have detailed explanations: E0075, E0076, E0077.
 For more information about an error, try `rustc --explain E0075`.