[gcc(refs/vendors/redhat/heads/gcc-8-branch)] aarch64: Fix ICE in final_scan_insn_1 [PR87839]

[Jakub Jelinek <jakub@gcc.gnu.org>]

https://gcc.gnu.org/g:a17b5e581d4107566d5ceedd5bbeec386fd060d9

commit a17b5e581d4107566d5ceedd5bbeec386fd060d9
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Nov 21 17:41:03 2018 +0100

    aarch64: Fix ICE in final_scan_insn_1 [PR87839]
    
    2021-05-07  Jakub Jelinek  <jakub@redhat.com>
    
            PR target/87839
            * config/aarch64/atomics.md (aarch64_compare_and_swap<mode>): Use
            rIJ constraint for aarch64_plus_operand rather than rn.
    
            * gcc.target/aarch64/pr87839.c: New test.

Diff:
---
 gcc/config/aarch64/atomics.md              |  2 +-
 gcc/testsuite/gcc.target/aarch64/pr87839.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/gcc/config/aarch64/atomics.md b/gcc/config/aarch64/atomics.md
index 0e0b0373192..d3f2b5da7f5 100644
--- a/gcc/config/aarch64/atomics.md
+++ b/gcc/config/aarch64/atomics.md
@@ -74,7 +74,7 @@
     (match_operand:GPI 1 "aarch64_sync_memory_operand" "+Q"))   ;; memory
    (set (match_dup 1)
     (unspec_volatile:GPI
-      [(match_operand:GPI 2 "aarch64_plus_operand" "rn")	;; expect
+      [(match_operand:GPI 2 "aarch64_plus_operand" "rIJ")	;; expect
        (match_operand:GPI 3 "aarch64_reg_or_zero" "rZ")		;; desired
        (match_operand:SI 4 "const_int_operand")			;; is_weak
        (match_operand:SI 5 "const_int_operand")			;; mod_s
diff --git a/gcc/testsuite/gcc.target/aarch64/pr87839.c b/gcc/testsuite/gcc.target/aarch64/pr87839.c
new file mode 100644
index 00000000000..1da0830be4f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/pr87839.c
@@ -0,0 +1,29 @@
+/* PR target/87839 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -w" } */
+
+long long b[64];
+void foo (void);
+int bar (void (*) (void));
+void qux (long long *, long long) __attribute__((noreturn));
+void quux (long long *, long long);
+
+void
+baz (void)
+{
+  __sync_val_compare_and_swap (b, 4294967298LL, 78187493520LL);
+  __sync_bool_compare_and_swap (b + 1, 8589934595LL, 21474836489LL);
+  __sync_fetch_and_xor (b, 60129542145LL);
+  quux (b, 42949672967LL);
+  __sync_xor_and_fetch (b + 22, 60129542145LL);
+  quux (b + 23, 42949672967LL);
+  if (bar (baz))
+    __builtin_abort ();
+  foo ();
+  __sync_val_compare_and_swap (b, 4294967298LL, 0);
+  __sync_bool_compare_and_swap (b + 1, 8589934595LL, 78187493520LL);
+  if (__sync_or_and_fetch (b, 21474836489LL) != 21474836489LL)
+    qux (b + 22, 60129542145LL);
+  __atomic_fetch_nand (b + 23, 42949672967LL, __ATOMIC_RELAXED);
+  bar (baz);
+}