[gcc r14-4657] s390: Fix expander popcountv8hi2_vx

[gcc r14-4657] s390: Fix expander popcountv8hi2_vx

[Stefan Schulze Frielinghaus]

https://gcc.gnu.org/g:d6ebe61889732afaf2e8fbf1c1fcc4a5486a5f93

commit r14-4657-gd6ebe61889732afaf2e8fbf1c1fcc4a5486a5f93
Author: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
Date:   Mon Oct 16 13:39:04 2023 +0200

    s390: Fix expander popcountv8hi2_vx
    
    The normal form of a CONST_INT which represents an integer of a mode
    with fewer bits than in HOST_WIDE_INT is sign extended.  This even holds
    for unsigned integers.
    
    This fixes an ICE during cse1 where we bail out at rtl.h:2297 since
    INTVAL (x.first) == sext_hwi (INTVAL (x.first), precision) does not hold.
    
    gcc/ChangeLog:
    
            * config/s390/vector.md (popcountv8hi2_vx): Sign extend each
            unsigned vector element.

Diff:
---
 gcc/config/s390/vector.md | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/gcc/config/s390/vector.md b/gcc/config/s390/vector.md
index f0e9ed3d263b..7d1eb36e8446 100644
--- a/gcc/config/s390/vector.md
+++ b/gcc/config/s390/vector.md
@@ -1154,14 +1154,14 @@
 	(plus:V16QI (match_dup 2) (match_dup 3)))
    ; Generate mask for the odd numbered byte elements
    (set (match_dup 3)
-	(const_vector:V16QI [(const_int 0) (const_int 255)
-			     (const_int 0) (const_int 255)
-			     (const_int 0) (const_int 255)
-			     (const_int 0) (const_int 255)
-			     (const_int 0) (const_int 255)
-			     (const_int 0) (const_int 255)
-			     (const_int 0) (const_int 255)
-			     (const_int 0) (const_int 255)]))
+	(const_vector:V16QI [(const_int 0) (const_int -1)
+			     (const_int 0) (const_int -1)
+			     (const_int 0) (const_int -1)
+			     (const_int 0) (const_int -1)
+			     (const_int 0) (const_int -1)
+			     (const_int 0) (const_int -1)
+			     (const_int 0) (const_int -1)
+			     (const_int 0) (const_int -1)]))
    ; Zero out the even indexed bytes
    (set (match_operand:V8HI 0 "register_operand" "=v")
 	(and:V8HI (subreg:V8HI (match_dup 2) 0)