Auto merge of #83819 - AngelicosPhosphoros:issue-73338-fix-partial-eq-impl, r=Mark-Simulacrum

Optimize jumps in PartialOrd le

Closes https://github.com/rust-lang/rust/issues/73338
This change stops default implementation of `le()` method of PartialOrd from generating jumps.

1 files changed, 39 insertions, 0 deletions

diff --git a/src/test/codegen/issue-73338-effecient-cmp.rs b/src/test/codegen/issue-73338-effecient-cmp.rs
new file mode 100644
index 00000000000..85c2bbfd040
--- /dev/null
+++ b/src/test/codegen/issue-73338-effecient-cmp.rs
@@ -0,0 +1,39 @@
+// This test checks that comparison operation
+// generated by #[derive(PartialOrd)]
+// doesn't contain jumps for C enums
+
+// compile-flags: -Copt-level=3
+
+#![crate_type="lib"]
+
+#[repr(u32)]
+#[derive(Copy, Clone, Eq, PartialEq, PartialOrd)]
+pub enum Foo {
+    Zero,
+    One,
+    Two,
+}
+
+#[no_mangle]
+pub fn compare_less(a: Foo, b: Foo)->bool{
+    // CHECK-NOT: br {{.*}}
+    a < b
+}
+
+#[no_mangle]
+pub fn compare_le(a: Foo, b: Foo)->bool{
+    // CHECK-NOT: br {{.*}}
+    a <= b
+}
+
+#[no_mangle]
+pub fn compare_ge(a: Foo, b: Foo)->bool{
+    // CHECK-NOT: br {{.*}}
+    a >= b
+}
+
+#[no_mangle]
+pub fn compare_greater(a: Foo, b: Foo)->bool{
+    // CHECK-NOT: br {{.*}}
+    a > b
+}