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From: "dima.pasechnik at cs dot ox.ac.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114872] [13/14/15 Regression] Miscompilation
 with -O2 after commit r13-8037
Date: Mon, 06 May 2024 22:45:58 +0000
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X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.2.1
X-Bugzilla-Keywords: wrong-code
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X-Bugzilla-Who: dima.pasechnik at cs dot ox.ac.uk
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114872

--- Comment #19 from Dmitrii Pasechnik <dima.pasechnik at cs dot ox.ac.uk> =
---
Declaring the last argument in the call to GAP_CallFunc3Args() volatile app=
ears
to fix the issue. Namely, apply

diff --git a/src/sage/libs/gap/element.pyx b/src/sage/libs/gap/element.pyx
index f1482997b8..7ca4a666ab 100644
--- a/src/sage/libs/gap/element.pyx
+++ b/src/sage/libs/gap/element.pyx
@@ -2504,6 +2504,7 @@ cdef class GapElement_Function(GapElement):
         cdef Obj result =3D NULL
         cdef Obj arg_list
         cdef int n =3D len(args)
+        cdef volatile Obj v2

         if n > 0 and n <=3D 3:
             libgap =3D self.parent()
@@ -2522,10 +2523,11 @@ cdef class GapElement_Function(GapElement):
                                            (<GapElement>a[0]).value,
                                            (<GapElement>a[1]).value)
             elif n =3D=3D 3:
+                v2 =3D (<GapElement>a[2]).value
                 result =3D GAP_CallFunc3Args(self.value,
                                            (<GapElement>a[0]).value,
                                            (<GapElement>a[1]).value,
-                                           (<GapElement>a[2]).value)
+                                           v2)
             else:
                 arg_list =3D make_gap_list(args)
                 result =3D GAP_CallFuncList(self.value, arg_list)=