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From: "stsp at users dot sourceforge.net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/98896] New: local label displaced with -O2
Date: Fri, 29 Jan 2021 22:08:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98896

            Bug ID: 98896
           Summary: local label displaced with -O2
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stsp at users dot sourceforge.net
  Target Milestone: ---

The following code works as expected with
clang, but hangs with gcc with -O2 (works with -O1):

---
int main()
{
    __label__ ret;
    asm volatile ("jmp *%0\n" :: "r"(&&ret) : "memory");
ret:
    return 0;
}
---

As can be seen from a disasm, the label is put before asm block.=