[Bug target/96243] For vector compare to mask register, UNSPEC is needed instead of comparison operator

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96243

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
cut from cse.c
---
3342     case RTX_COMPARE:
3343     case RTX_COMM_COMPARE:
3344       /* See what items are actually being compared and set FOLDED_ARG[01]
3345          to those values and CODE to the actual comparison code.  If any
are
3346          constant, set CONST_ARG0 and CONST_ARG1 appropriately.  We
needn't
3347          do anything if both operands are already known to be constant. 
*/
3348 
3349       /* ??? Vector mode comparisons are not supported yet.  */
3350       if (VECTOR_MODE_P (mode))
3351         break;
---