[Bug target/107061] New: ENCODEKEY128 clobbers xmm4-xmm6

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107061

            Bug ID: 107061
           Summary: ENCODEKEY128 clobbers xmm4-xmm6
           Product: gcc
           Version: 12.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: crazylht at gmail dot com, wwwhhhyyy333 at gmail dot com
  Target Milestone: ---
            Target: i386

The current ENCODEKEY128 clears xmm4-xmm6.  But Intel key lock spec has

XMM4 through XMM6 are reserved for future usages and software should not
rely upon them being zeroed.

xmm4-xmm6 should be marked as clobbered, not zeroed for future compatibility.