s390: Fix s390_constant_via_vgbm_p() [PR118362]

Optimization s390_constant_via_vgbm_p() should only apply to constant
vectors which can be expressed by the hardware, i.e., which have a size
of at most 16-bytes, similar as it is done for s390_constant_via_vgm_p()
and s390_constant_via_vrepi_p().

gcc/ChangeLog:

	PR target/118362
	* config/s390/s390.cc (s390_constant_via_vgbm_p): Allow at most
	16-byte vectors.

diff --git a/gcc/config/s390/s390.cc b/gcc/config/s390/s390.cc
index 918a2cd6c6dfa994902c3ff49be08c9fc569d575..08acb69de3e88398332b333d25f3ec85bf707cbc 100644 (file)
--- a/gcc/config/s390/s390.cc
+++ b/gcc/config/s390/s390.cc
@@ -2818,7 +2818,7 @@ s390_constant_via_vgbm_p (rtx op, unsigned *mask)
   unsigned tmp_mask = 0;
   int nunit, unit_size;
 
-  if (GET_CODE (op) == CONST_VECTOR)
+  if (GET_CODE (op) == CONST_VECTOR && GET_MODE_SIZE (GET_MODE (op)) <= 16)
     {
       if (GET_MODE_INNER (GET_MODE (op)) == TImode
          || GET_MODE_INNER (GET_MODE (op)) == TFmode)