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From: "acsawdey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/97926] ICE in patch_jump_insn, at cfgrtl.c:1298
Date: Wed, 17 Mar 2021 01:36:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97926

--- Comment #2 from acsawdey at gcc dot gnu.org ---
patch_jump_insn() is running into a land mine -- the insn before modificati=
on
is invalid:

(gdb) p insn_invalid_p(insn, true)
$4 =3D 1
(gdb) pr insn
(jump_insn 18 17 114 6 (set (pc)
        (if_then_else (unle (reg:CCFP 131)
                (const_int 0 [0]))
            (label_ref 21)
            (pc)))
"../../gcc/gcc/testsuite/c-c++-common/ubsan/float-cast-overflow-11.c":9:10 =
-1
     (nil)
 -> 21)

So verify_changes() fails because the same insn with a different label_ref
inserted is also invalid.=