[Bug gas/31178] New: [2.42 regression] Crash when building Valgrind tests (Internal error in build_vex_prefix in tc-i386.c:376)

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31178

            Bug ID: 31178
           Summary: [2.42 regression] Crash when building Valgrind tests
                    (Internal error in build_vex_prefix in tc-i386.c:376)
           Product: binutils
           Version: 2.42 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: sam at gentoo dot org
  Target Milestone: 2.42

Created attachment 15263
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15263&action=edit
vcpu_fbench-vcpu_fbench.i

```
$ gcc-13 -c vcpu_fbench-vcpu_fbench.i -O3 -march=znver2 -Wa,-O2
/tmp/ccmQb140.s: Assembler messages:
/tmp/ccmQb140.s:523: Internal error in build_vex_prefix at
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/gas/config/tc-i386.c:3764.
Please report this bug.
```

```
$ ld --version
GNU ld (Gentoo 9999 p1) 2.41.50.20231218
Copyright (C) 2023 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.
```

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