*** empty log message ***

From-SVN: r676

gcc/caller-save.c

@@ -522,6 +522,16 @@ insert_save_restore (insn, save_p, regno, insn_mode)
   enum insn_code code;
   int i;
 
+  /* A common failure mode if register status is not correct in the RTL
+     is for this routine to be called with a REGNO we didn't expect to
+     save.  That will cause us to write an insn with a (nil) SET_DEST
+     or SET_SRC.  Instead of doing so and causing a crash later, check
+     for this common case and abort here instead.  This will remove one
+     step in debugging such problems.  */
+
+  if (regno_save_mem[regno] == 0)
+    abort ();
+
   /* If INSN is a CALL_INSN, we must insert our insns before any
      USE insns in front of the CALL_INSN.  */
 

gcc/config/m88k/m88k.md

@@ -1244,7 +1244,6 @@
 ;; operand 3 is the offset for the source and destination pointers
 ;; operand 4 is the first value to be loaded
 ;; operand 5 is the register to hold the value (r4 or r5)
-;; Upon completion, r2 and r3 are unchanged
 
 (define_expand "call_block_move"
   [(set (reg:SI 3) (minus:SI (match_operand:SI 2 "register_operand" "r")
@@ -1255,13 +1254,10 @@
 			     (match_dup 3)))
    (use (reg:SI 2))
    (use (reg:SI 3))
-   (use (reg:SI 4))
-   (use (reg:SI 5))
+   (use (match_dup 5))
    (parallel [(call (mem:SI (match_operand 0 "" ""))
 		    (const_int 0))
-	      (use (reg:SI 1))])
-   (clobber (reg:SI 4))
-   (clobber (reg:SI 5))]
+	      (use (reg:SI 1))])]
   ""
   "")
 
@@ -1279,15 +1275,11 @@
    (set (reg:SI 6) (match_operand:SI 6 "immediate_operand" "i"))
    (use (reg:SI 2))
    (use (reg:SI 3))
-   (use (reg:SI 4))
-   (use (reg:SI 5))
+   (use (match_dup 5))
    (use (reg:SI 6))
    (parallel [(call (mem:SI (match_operand 0 "" ""))
 		    (const_int 0))
-	      (use (reg:SI 1))])
-   (clobber (reg:SI 4))
-   (clobber (reg:SI 5))
-   (clobber (reg:SI 6))]
+	      (use (reg:SI 1))])]
   ""
   "")