"uint64_t a & 0xfffffffffff" expands to two and:SI on LA32 with -O0:
(insn 8 7 9 (set (subreg:SI (reg:DI 82 [ a_2 ]) 0)
(and:SI (reg:SI 83)
(const_int -1 [0xffffffffffffffff]))) "t.c":3:5 -1
(nil))
(insn 10 9 11 (set (subreg:SI (reg:DI 82 [ a_2 ]) 4)
(and:SI (reg:SI 84)
(const_int 4095 [0xfff]))) "t.c":3:5 -1
(nil))
"insn 8" -1 operand can't match Yx constraint low_bitmask_len condition.
low_bitmask_len can selects a field of low-order bits within an item but not
the entire word. Add (match_test "INTVAL (op) == -1") to low_bitmask_operand
predicate.
Note: "uint64_t a & 0xffffffffffffffff" and "uint32_t a & 0xffffffff" are
optimized away before expand with -O0, can't cause this error.
gcc/ChangeLog:
* config/loongarch/predicates.md: Add CONSTM1_RTX for
low_bitmask_operand.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/la32/and.c: New test.
* gcc.target/loongarch/la32/la32.exp: New test.
---
gcc/config/loongarch/predicates.md | 4 +-
gcc/testsuite/gcc.target/loongarch/la32/and.c | 8 ++++
.../gcc.target/loongarch/la32/la32.exp | 40 +++++++++++++++++++
3 files changed, 51 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.target/loongarch/la32/and.c
create mode 100644 gcc/testsuite/gcc.target/loongarch/la32/la32.exp
diff --git a/gcc/config/loongarch/predicates.md
b/gcc/config/loongarch/predicates.md
index 6672e494f39..d8cb39bdd46 100644
--- a/gcc/config/loongarch/predicates.md
+++ b/gcc/config/loongarch/predicates.md
@@ -291,7 +291,9 @@ (define_predicate "si_mask_operand"
(define_predicate "low_bitmask_operand"
(and (match_code "const_int")
- (match_test "low_bitmask_len (mode, INTVAL (op)) > 12")
+ (ior
+ (match_test "low_bitmask_len (mode, INTVAL (op)) > 12")
+ (match_test "op == CONSTM1_RTX (GET_MODE (op))"))
(match_test "!TARGET_32BIT_R")))
(define_predicate "d_operand"
diff --git a/gcc/testsuite/gcc.target/loongarch/la32/and.c
b/gcc/testsuite/gcc.target/loongarch/la32/and.c
new file mode 100644
index 00000000000..e9af5c86576
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/la32/and.c
@@ -0,0 +1,8 @@
+/* { dg-do compile { target { loongarch32*-*-* } } } */
+/* { dg-options "-O0" } */
+
+#include <stdint.h>
+uint64_t f(uint64_t a) {
+ a = a & 0xfffffffffffff;
+ return a;
+}
diff --git a/gcc/testsuite/gcc.target/loongarch/la32/la32.exp
b/gcc/testsuite/gcc.target/loongarch/la32/la32.exp
new file mode 100644
index 00000000000..52055fb5f63
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/la32/la32.exp
@@ -0,0 +1,40 @@
+# Copyright (C) 2021-2025 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3. If not see
+# <http://www.gnu.org/licenses/>.
+
+# GCC testsuite that uses the `dg.exp' driver.
+
+# Exit immediately if this isn't a LoongArch target.
+if ![istarget loongarch32*-*-*] then {
+ return
+}
+
+# Load support procs.
+load_lib gcc-dg.exp
+
+# If a testcase doesn't have special options, use these.
+global DEFAULT_CFLAGS
+if ![info exists DEFAULT_CFLAGS] then {
+ set DEFAULT_CFLAGS " "
+}
+
+# Initialize `dg'.
+dg-init
+
+# Main loop.
+dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/*.\[cS\]]] \
+ "" $DEFAULT_CFLAGS
+# All done.
+dg-finish
--
2.34.1
