[Bug rtl-optimization/91976] [10 regression] RTL check: expected code 'const_int', have 'reg' in emit_block_move_hints, at expr.c:1627

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91976

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think
--- gcc/expr.c.jj       2019-10-02 16:35:20.977451346 +0200
+++ gcc/expr.c  2019-10-02 21:47:54.900724874 +0200
@@ -1624,16 +1624,18 @@ emit_block_move_hints (rtx x, rtx y, rtx
       set_mem_size (y, const_size);
     }

-  bool pieces_ok = can_move_by_pieces (INTVAL (size), align);
+  bool pieces_ok = false;
+  if (CONST_INT_P (size))
+    pieces_ok = can_move_by_pieces (INTVAL (size), align);
   bool pattern_ok = false;

-  if (!CONST_INT_P (size) || !pieces_ok || might_overlap)
+  if (!pieces_ok || might_overlap)
     {
-      pattern_ok = 
-       emit_block_move_via_pattern (x, y, size, align,
-                                    expected_align, expected_size,
-                                    min_size, max_size, probable_max_size,
-                                    might_overlap);
+      pattern_ok
+       = emit_block_move_via_pattern (x, y, size, align,
+                                      expected_align, expected_size,
+                                      min_size, max_size, probable_max_size,
+                                      might_overlap);
       if (!pattern_ok && might_overlap)
        {
          /* Do not try any of the other methods below as they are not safe
@@ -1645,7 +1647,7 @@ emit_block_move_hints (rtx x, rtx y, rtx

   if (pattern_ok)
     ;
-  else if (CONST_INT_P (size) && pieces_ok)
+  else if (pieces_ok)
     move_by_pieces (x, y, INTVAL (size), align, RETURN_BEGIN);
   else if (may_use_call && !might_overlap
           && ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (x))
should fix this.