[gcc r14-7166] target/112280 - properly guard permute query

[Richard Biener]

https://gcc.gnu.org/g:655b6cb1ea3a0e23124d77dccd5d174ac59c429c

commit r14-7166-g655b6cb1ea3a0e23124d77dccd5d174ac59c429c
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jan 11 14:55:50 2024 +0100

    target/112280 - properly guard permute query
    
    The following adds guards avoiding code generation to
    expand_perm_as_a_vlbr_vstbr_candidate when d.testing_p.
    
            PR target/112280
            * config/s390/s390.cc (expand_perm_as_a_vlbr_vstbr_candidate):
            Do not generate code when d.testing_p.

Diff:
---
 gcc/config/s390/s390.cc | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/gcc/config/s390/s390.cc b/gcc/config/s390/s390.cc
index 748ad9cd932..f182c26e78b 100644
--- a/gcc/config/s390/s390.cc
+++ b/gcc/config/s390/s390.cc
@@ -17867,33 +17867,45 @@ expand_perm_as_a_vlbr_vstbr_candidate (const struct expand_vec_perm_d &d)
 
   if (memcmp (d.perm, perm[0], MAX_VECT_LEN) == 0)
     {
-      rtx target = gen_rtx_SUBREG (V8HImode, d.target, 0);
-      rtx op0 = gen_rtx_SUBREG (V8HImode, d.op0, 0);
-      emit_insn (gen_bswapv8hi (target, op0));
+      if (!d.testing_p)
+	{
+	  rtx target = gen_rtx_SUBREG (V8HImode, d.target, 0);
+	  rtx op0 = gen_rtx_SUBREG (V8HImode, d.op0, 0);
+	  emit_insn (gen_bswapv8hi (target, op0));
+	}
       return true;
     }
 
   if (memcmp (d.perm, perm[1], MAX_VECT_LEN) == 0)
     {
-      rtx target = gen_rtx_SUBREG (V4SImode, d.target, 0);
-      rtx op0 = gen_rtx_SUBREG (V4SImode, d.op0, 0);
-      emit_insn (gen_bswapv4si (target, op0));
+      if (!d.testing_p)
+	{
+	  rtx target = gen_rtx_SUBREG (V4SImode, d.target, 0);
+	  rtx op0 = gen_rtx_SUBREG (V4SImode, d.op0, 0);
+	  emit_insn (gen_bswapv4si (target, op0));
+	}
       return true;
     }
 
   if (memcmp (d.perm, perm[2], MAX_VECT_LEN) == 0)
     {
-      rtx target = gen_rtx_SUBREG (V2DImode, d.target, 0);
-      rtx op0 = gen_rtx_SUBREG (V2DImode, d.op0, 0);
-      emit_insn (gen_bswapv2di (target, op0));
+      if (!d.testing_p)
+	{
+	  rtx target = gen_rtx_SUBREG (V2DImode, d.target, 0);
+	  rtx op0 = gen_rtx_SUBREG (V2DImode, d.op0, 0);
+	  emit_insn (gen_bswapv2di (target, op0));
+	}
       return true;
     }
 
   if (memcmp (d.perm, perm[3], MAX_VECT_LEN) == 0)
     {
-      rtx target = gen_rtx_SUBREG (V1TImode, d.target, 0);
-      rtx op0 = gen_rtx_SUBREG (V1TImode, d.op0, 0);
-      emit_insn (gen_bswapv1ti (target, op0));
+      if (!d.testing_p)
+	{
+	  rtx target = gen_rtx_SUBREG (V1TImode, d.target, 0);
+	  rtx op0 = gen_rtx_SUBREG (V1TImode, d.op0, 0);
+	  emit_insn (gen_bswapv1ti (target, op0));
+	}
       return true;
     }