https://gcc.gnu.org/g:1a71ff3b89aadc7fa0af0bca269d74bb23c1a957
commit r15-3625-g1a71ff3b89aadc7fa0af0bca269d74bb23c1a957
Author: Stefan Schulze Frielinghaus <stefa...@gcc.gnu.org>
Date: Fri Sep 13 15:05:33 2024 +0200
s390: Fix AQ and AR constraints
Ensure for AQ and AR constraints that the resulting displacement after
adding any positive offset less than the size of the object being
referenced is still valid.
gcc/ChangeLog:
* config/s390/s390.cc (s390_mem_constraint): Check displacement
for AQ and AR constraints.
Diff:
---
gcc/config/s390/s390.cc | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/gcc/config/s390/s390.cc b/gcc/config/s390/s390.cc
index c1649ca49bd1..926987113dd4 100644
--- a/gcc/config/s390/s390.cc
+++ b/gcc/config/s390/s390.cc
@@ -3689,6 +3689,18 @@ s390_mem_constraint (const char *str, rtx op)
if ((reload_completed || reload_in_progress)
? !offsettable_memref_p (op) : !offsettable_nonstrict_memref_p (op))
return 0;
+ /* offsettable_memref_p ensures only that any positive offset added to
+ the address forms a valid general address. For AQ and AR constraints
+ we also have to verify that the resulting displacement after adding
+ any positive offset less than the size of the object being referenced
+ is still valid. */
+ if (str[1] == 'Q' || str[1] == 'R')
+ {
+ int o = GET_MODE_SIZE (GET_MODE (op)) - 1;
+ rtx tmp = adjust_address (op, QImode, o);
+ if (!s390_check_qrst_address (str[1], XEXP (tmp, 0), true))
+ return 0;
+ }
return s390_check_qrst_address (str[1], XEXP (op, 0), true);
case 'B':
/* Check for non-literal-pool variants of memory constraints. */
