Simplify code related to testing of xtest

crates/core_arch/src/x86/xsave.rs

@@ -167,6 +167,7 @@ mod tests {
     use stdarch_test::simd_test;
 
     #[repr(align(64))]
+    #[derive(Debug)]
     struct XsaveArea {
         // max size for 256-bit registers is 800 bytes:
         // see https://software.intel.com/en-us/node/682996
@@ -198,19 +199,6 @@ mod tests {
         }
     }
 
-    impl fmt::Debug for XsaveArea {
-        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-            write!(f, "[")?;
-            for i in 0..self.data.len() {
-                write!(f, "{}", self.data[i])?;
-                if i != self.data.len() - 1 {
-                    write!(f, ", ")?;
-                }
-            }
-            write!(f, "]")
-        }
-    }
-
     // We cannot test for `_xsave`, `xrstor`, `_xsetbv`, `_xsaveopt`, `_xsaves`, `_xrstors` as they
     // are privileged instructions and will need access to kernel mode to execute and test them.
     // see https://github.com/rust-lang/stdarch/issues/209

crates/core_arch/src/x86_64/xsave.rs

@@ -131,6 +131,7 @@ mod tests {
     use stdarch_test::simd_test;
 
     #[repr(align(64))]
+    #[derive(Debug)]
     struct XsaveArea {
         // max size for 256-bit registers is 800 bytes:
         // see https://software.intel.com/en-us/node/682996
@@ -144,7 +145,7 @@ mod tests {
             XsaveArea { data: [0; 2560] }
         }
         fn ptr(&mut self) -> *mut u8 {
-            &mut self.data[0] as *mut _ as *mut u8
+            self.data.as_mut_ptr()
         }
     }
 
@@ -162,19 +163,6 @@ mod tests {
         }
     }
 
-    impl fmt::Debug for XsaveArea {
-        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-            write!(f, "[")?;
-            for i in 0..self.data.len() {
-                write!(f, "{}", self.data[i])?;
-                if i != self.data.len() - 1 {
-                    write!(f, ", ")?;
-                }
-            }
-            write!(f, "]")
-        }
-    }
-
     // We cannot test `_xsave64`, `_xrstor64`, `_xsaveopt64`, `_xsaves64` and `_xrstors64` directly
     // as they are privileged instructions and will need access to the kernel to run and test them.
     // See https://github.com/rust-lang/stdarch/issues/209