target/105753: Fix ICE in add_clobbers due to extra PARALLEL in insn.

This patch removes the superfluous parallel in [u]divmod patterns in
the AVR backend.  Effect of extra parallel is that add_clobbers reaches
gcc_unreachable() because the clobbers for [u]divmod are missing.
If an insn has multiple parts like clobbers, the parallel around the
parts of the insn pattern is implicit.

gcc/
	PR target/105753
	* config/avr/avr.md (divmodpsi, udivmodpsi, divmodsi, udivmodsi):
	Remove superfluous "parallel" in insn pattern.
	([u]divmod<mode>4): Tidy code.  Use gcc_unreachable() instead of
	printing error text to assembly.

gcc/testsuite/
	PR target/105753
	* gcc.target/avr/torture/pr105753.c: New test.

2 files changed, 77 insertions, 62 deletions

diff --git a/gcc/config/avr/avr.md b/gcc/config/avr/avr.md
index 43b7504..a79c682 100644
--- a/gcc/config/avr/avr.md
+++ b/gcc/config/avr/avr.md
@@ -3705,17 +3705,17 @@
 ;;    CSE has problems to operate on hard regs.
 ;;
 (define_insn_and_split "divmodqi4"
-  [(set (match_operand:QI 0 "pseudo_register_operand" "")
-        (div:QI (match_operand:QI 1 "pseudo_register_operand" "")
-                (match_operand:QI 2 "pseudo_register_operand" "")))
-   (set (match_operand:QI 3 "pseudo_register_operand" "")
+  [(set (match_operand:QI 0 "pseudo_register_operand")
+        (div:QI (match_operand:QI 1 "pseudo_register_operand")
+                (match_operand:QI 2 "pseudo_register_operand")))
+   (set (match_operand:QI 3 "pseudo_register_operand")
         (mod:QI (match_dup 1) (match_dup 2)))
    (clobber (reg:QI 22))
    (clobber (reg:QI 23))
    (clobber (reg:QI 24))
    (clobber (reg:QI 25))]
   ""
-  "this divmodqi4 pattern should have been splitted;"
+  { gcc_unreachable(); }
   ""
   [(set (reg:QI 24) (match_dup 1))
    (set (reg:QI 22) (match_dup 2))
@@ -3751,17 +3751,17 @@
   [(set_attr "type" "xcall")])
 
 (define_insn_and_split "udivmodqi4"
- [(set (match_operand:QI 0 "pseudo_register_operand" "")
-       (udiv:QI (match_operand:QI 1 "pseudo_register_operand" "")
-                (match_operand:QI 2 "pseudo_register_operand" "")))
-       (set (match_operand:QI 3 "pseudo_register_operand" "")
-            (umod:QI (match_dup 1) (match_dup 2)))
-       (clobber (reg:QI 22))
-       (clobber (reg:QI 23))
-       (clobber (reg:QI 24))
-       (clobber (reg:QI 25))]
-  ""
-  "this udivmodqi4 pattern should have been splitted;"
+ [(set (match_operand:QI 0 "pseudo_register_operand")
+       (udiv:QI (match_operand:QI 1 "pseudo_register_operand")
+                (match_operand:QI 2 "pseudo_register_operand")))
+  (set (match_operand:QI 3 "pseudo_register_operand")
+       (umod:QI (match_dup 1) (match_dup 2)))
+  (clobber (reg:QI 22))
+  (clobber (reg:QI 23))
+  (clobber (reg:QI 24))
+  (clobber (reg:QI 25))]
+  ""
+  { gcc_unreachable(); }
   ""
   [(set (reg:QI 24) (match_dup 1))
    (set (reg:QI 22) (match_dup 2))
@@ -3793,17 +3793,17 @@
   [(set_attr "type" "xcall")])
 
 (define_insn_and_split "divmodhi4"
-  [(set (match_operand:HI 0 "pseudo_register_operand" "")
-        (div:HI (match_operand:HI 1 "pseudo_register_operand" "")
-                (match_operand:HI 2 "pseudo_register_operand" "")))
-   (set (match_operand:HI 3 "pseudo_register_operand" "")
+  [(set (match_operand:HI 0 "pseudo_register_operand")
+        (div:HI (match_operand:HI 1 "pseudo_register_operand")
+                (match_operand:HI 2 "pseudo_register_operand")))
+   (set (match_operand:HI 3 "pseudo_register_operand")
         (mod:HI (match_dup 1) (match_dup 2)))
    (clobber (reg:QI 21))
    (clobber (reg:HI 22))
    (clobber (reg:HI 24))
    (clobber (reg:HI 26))]
   ""
-  "this should have been splitted;"
+  { gcc_unreachable(); }
   ""
   [(set (reg:HI 24) (match_dup 1))
    (set (reg:HI 22) (match_dup 2))
@@ -3839,17 +3839,17 @@
   [(set_attr "type" "xcall")])
 
 (define_insn_and_split "udivmodhi4"
-  [(set (match_operand:HI 0 "pseudo_register_operand" "")
-        (udiv:HI (match_operand:HI 1 "pseudo_register_operand" "")
-                 (match_operand:HI 2 "pseudo_register_operand" "")))
-   (set (match_operand:HI 3 "pseudo_register_operand" "")
+  [(set (match_operand:HI 0 "pseudo_register_operand")
+        (udiv:HI (match_operand:HI 1 "pseudo_register_operand")
+                 (match_operand:HI 2 "pseudo_register_operand")))
+   (set (match_operand:HI 3 "pseudo_register_operand")
         (umod:HI (match_dup 1) (match_dup 2)))
    (clobber (reg:QI 21))
    (clobber (reg:HI 22))
    (clobber (reg:HI 24))
    (clobber (reg:HI 26))]
   ""
-  "this udivmodhi4 pattern should have been splitted.;"
+  { gcc_unreachable(); }
   ""
   [(set (reg:HI 24) (match_dup 1))
    (set (reg:HI 22) (match_dup 2))
@@ -4090,14 +4090,14 @@
 ;; implementation works the other way round.
 
 (define_insn_and_split "divmodpsi4"
-  [(parallel [(set (match_operand:PSI 0 "pseudo_register_operand" "")
-                   (div:PSI (match_operand:PSI 1 "pseudo_register_operand" "")
-                            (match_operand:PSI 2 "pseudo_register_operand" "")))
-              (set (match_operand:PSI 3 "pseudo_register_operand" "")
-                   (mod:PSI (match_dup 1)
-                            (match_dup 2)))
-              (clobber (reg:DI 18))
-              (clobber (reg:QI 26))])]
+  [(set (match_operand:PSI 0 "pseudo_register_operand")
+        (div:PSI (match_operand:PSI 1 "pseudo_register_operand")
+                 (match_operand:PSI 2 "pseudo_register_operand")))
+   (set (match_operand:PSI 3 "pseudo_register_operand")
+        (mod:PSI (match_dup 1)
+                 (match_dup 2)))
+   (clobber (reg:DI 18))
+   (clobber (reg:QI 26))]
   ""
   { gcc_unreachable(); }
   ""
@@ -4139,14 +4139,14 @@
   [(set_attr "type" "xcall")])
 
 (define_insn_and_split "udivmodpsi4"
-  [(parallel [(set (match_operand:PSI 0 "pseudo_register_operand" "")
-                   (udiv:PSI (match_operand:PSI 1 "pseudo_register_operand" "")
-                             (match_operand:PSI 2 "pseudo_register_operand" "")))
-              (set (match_operand:PSI 3 "pseudo_register_operand" "")
-                   (umod:PSI (match_dup 1)
-                             (match_dup 2)))
-              (clobber (reg:DI 18))
-              (clobber (reg:QI 26))])]
+  [(set (match_operand:PSI 0 "pseudo_register_operand")
+        (udiv:PSI (match_operand:PSI 1 "pseudo_register_operand")
+                  (match_operand:PSI 2 "pseudo_register_operand")))
+   (set (match_operand:PSI 3 "pseudo_register_operand")
+        (umod:PSI (match_dup 1)
+                  (match_dup 2)))
+   (clobber (reg:DI 18))
+   (clobber (reg:QI 26))]
   ""
   { gcc_unreachable(); }
   ""
@@ -4190,17 +4190,18 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (define_insn_and_split "divmodsi4"
-  [(parallel [(set (match_operand:SI 0 "pseudo_register_operand" "")
-                   (div:SI (match_operand:SI 1 "pseudo_register_operand" "")
-                           (match_operand:SI 2 "pseudo_register_operand" "")))
-              (set (match_operand:SI 3 "pseudo_register_operand" "")
-                   (mod:SI (match_dup 1) (match_dup 2)))
-              (clobber (reg:SI 18))
-              (clobber (reg:SI 22))
-              (clobber (reg:HI 26))
-              (clobber (reg:HI 30))])]
+  [(set (match_operand:SI 0 "pseudo_register_operand")
+        (div:SI (match_operand:SI 1 "pseudo_register_operand")
+                (match_operand:SI 2 "pseudo_register_operand")))
+   (set (match_operand:SI 3 "pseudo_register_operand")
+        (mod:SI (match_dup 1)
+	        (match_dup 2)))
+   (clobber (reg:SI 18))
+   (clobber (reg:SI 22))
+   (clobber (reg:HI 26))
+   (clobber (reg:HI 30))]
   ""
-  "this divmodsi4 pattern should have been splitted;"
+  { gcc_unreachable(); }
   ""
   [(set (reg:SI 22) (match_dup 1))
    (set (reg:SI 18) (match_dup 2))
@@ -4236,17 +4237,18 @@
   [(set_attr "type" "xcall")])
 
 (define_insn_and_split "udivmodsi4"
-  [(parallel [(set (match_operand:SI 0 "pseudo_register_operand" "")
-                   (udiv:SI (match_operand:SI 1 "pseudo_register_operand" "")
-                           (match_operand:SI 2 "pseudo_register_operand" "")))
-              (set (match_operand:SI 3 "pseudo_register_operand" "")
-                   (umod:SI (match_dup 1) (match_dup 2)))
-              (clobber (reg:SI 18))
-              (clobber (reg:SI 22))
-              (clobber (reg:HI 26))
-              (clobber (reg:HI 30))])]
+  [(set (match_operand:SI 0 "pseudo_register_operand")
+        (udiv:SI (match_operand:SI 1 "pseudo_register_operand")
+                 (match_operand:SI 2 "pseudo_register_operand")))
+   (set (match_operand:SI 3 "pseudo_register_operand")
+        (umod:SI (match_dup 1)
+                 (match_dup 2)))
+   (clobber (reg:SI 18))
+   (clobber (reg:SI 22))
+   (clobber (reg:HI 26))
+   (clobber (reg:HI 30))]
   ""
-  "this udivmodsi4 pattern should have been splitted;"
+  { gcc_unreachable(); }
   ""
   [(set (reg:SI 22) (match_dup 1))
    (set (reg:SI 18) (match_dup 2))
diff --git a/gcc/testsuite/gcc.target/avr/torture/pr105753.c b/gcc/testsuite/gcc.target/avr/torture/pr105753.c
new file mode 100644
index 0000000..7d7cea1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/avr/torture/pr105753.c
@@ -0,0 +1,13 @@
+int digit_sum (unsigned long n)
+{
+  int sum = 0;
+
+  do
+    {
+      int x = n % 10;
+      n /= 10;
+      sum += x;
+    } while(n);
+
+  return sum;
+}