gh-131798: Optimize _UNARY_NEGATIVE (GH-135223)

Lib/test/test_capi/test_opt.py

@@ -2432,6 +2432,24 @@ class TestUopsOptimization(unittest.TestCase):
         self.assertIn("_POP_TOP_FLOAT", uops)
 
 
+    def test_unary_negative_long_float_type(self):
+        def testfunc(n):
+            for _ in range(n):
+                a = 9397
+                f = 9397.0
+                x = -a + -a
+                y = -f + -f
+
+        testfunc(TIER2_THRESHOLD)
+
+        ex = get_first_executor(testfunc)
+        self.assertIsNotNone(ex)
+        uops = get_opnames(ex)
+
+        self.assertNotIn("_GUARD_TOS_INT", uops)
+        self.assertNotIn("_GUARD_NOS_INT", uops)
+        self.assertNotIn("_GUARD_TOS_FLOAT", uops)
+        self.assertNotIn("_GUARD_NOS_FLOAT", uops)
 
 def global_identity(x):
     return x

Misc/NEWS.d/next/Core_and_Builtins/2025-06-06-19-17-22.gh-issue-131798.XoV8Eb.rst

@@ -0,0 +1 @@
+Optimize ``_UNARY_NEGATIVE`` in JIT-compiled code.

Python/optimizer_bytecodes.c

@@ -452,7 +452,13 @@ dummy_func(void) {
             res = sym_new_compact_int(ctx);
         }
         else {
-            res = sym_new_not_null(ctx);
+            PyTypeObject *type = sym_get_type(value);
+            if (type == &PyLong_Type || type == &PyFloat_Type) {
+                res = sym_new_type(ctx, type);
+            }
+            else {
+                res = sym_new_not_null(ctx);
+            }
         }
     }
 

Python/optimizer_cases.c.h

@@ -190,7 +190,13 @@
                 res = sym_new_compact_int(ctx);
             }
             else {
-                res = sym_new_not_null(ctx);
+                PyTypeObject *type = sym_get_type(value);
+                if (type == &PyLong_Type || type == &PyFloat_Type) {
+                    res = sym_new_type(ctx, type);
+                }
+                else {
+                    res = sym_new_not_null(ctx);
+                }
             }
             stack_pointer[-1] = res;
             break;