[gcc r15-7833] PR rtl-optimization/119046: aarch64: Fix PARALLEL mode for vec_perm DUP expansion

[Kyrylo Tkachov]

https://gcc.gnu.org/g:ff505948631713d8c62523005059b10e25343617

commit r15-7833-gff505948631713d8c62523005059b10e25343617
Author: Kyrylo Tkachov <ktkachov@nvidia.com>
Date:   Wed Mar 5 03:03:52 2025 -0800

    PR rtl-optimization/119046: aarch64: Fix PARALLEL mode for vec_perm DUP expansion
    
    The PARALLEL created in aarch64_evpc_dup is used to hold the lane number.
    It is not appropriate for it to have a vector mode.
    Other such uses use VOIDmode.
    Do this here as well.
    This avoids the risk of generic code treating the PARALLEL as trapping when it
    has floating-point mode.
    
    Bootstrapped and tested on aarch64-none-linux-gnu.
    
    Signed-off-by: Kyrylo Tkachov <ktkachov@nvidia.com>
    
            PR rtl-optimization/119046
            * config/aarch64/aarch64.cc (aarch64_evpc_dup): Use VOIDmode for
            PARALLEL.

Diff:
---
 gcc/config/aarch64/aarch64.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index af3871ce8a1f..9196b8d906c8 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -26301,7 +26301,7 @@ aarch64_evpc_dup (struct expand_vec_perm_d *d)
   in0 = d->op0;
   lane = GEN_INT (elt); /* The pattern corrects for big-endian.  */
 
-  rtx parallel = gen_rtx_PARALLEL (vmode, gen_rtvec (1, lane));
+  rtx parallel = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (1, lane));
   rtx select = gen_rtx_VEC_SELECT (GET_MODE_INNER (vmode), in0, parallel);
   emit_set_insn (out, gen_rtx_VEC_DUPLICATE (vmode, select));
   return true;