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[Bug middle-end/81695] [5/6/7/8 Regression] internal compiler error: in size_binop_loc, at fold-const.c:1768
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 03 Aug 2017 13:55:46 +0000
- Subject: [Bug middle-end/81695] [5/6/7/8 Regression] internal compiler error: in size_binop_loc, at fold-const.c:1768
- Auto-submitted: auto-generated
- References: <bug-81695-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81695
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, one mistake in the folding is that
if (TREE_CODE (sub) == POINTER_PLUS_EXPR
&& TREE_CODE (TREE_OPERAND (sub, 1)) == INTEGER_CST)
{
tree op00 = TREE_OPERAND (sub, 0);
tree op01 = TREE_OPERAND (sub, 1);
^^^
this has to be interpreted as signed (but is always sizetype). I suspect
restricting this to INTEGER_CST min_val and doing the arithmetic with
offset_ints is easiest. The non-ARRAY_TYPE cases look ok to me.