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(layout_type... 

(layout_type, case ARRAY_TYPE): Strip MAX_EXPR from upper bound when
computing length if it just protects against negative length.

From-SVN: r10430
This commit is contained in:
Richard Kenner 1995-10-03 19:15:52 -04:00
parent 675f0e7cb2
commit e24ff97333
1 changed files with 22 additions and 4 deletions
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26
gcc/stor-layout.c
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@ -747,10 +747,28 @@ layout_type (type)
if (index && TYPE_MAX_VALUE (index) && TYPE_MIN_VALUE (index)
&& TYPE_SIZE (element))
{
tree length
= size_binop (PLUS_EXPR, size_one_node,
size_binop (MINUS_EXPR, TYPE_MAX_VALUE (index),
TYPE_MIN_VALUE (index)));
tree ub = TYPE_MAX_VALUE (index);
tree lb = TYPE_MIN_VALUE (index);
tree length;
/* If UB is max (lb - 1, x), remove the MAX_EXPR since the
test for negative below covers it. */
if (TREE_CODE (ub) == MAX_EXPR
&& TREE_CODE (TREE_OPERAND (ub, 0)) == MINUS_EXPR
&& integer_onep (TREE_OPERAND (TREE_OPERAND (ub, 0), 1))
&& operand_equal_p (TREE_OPERAND (TREE_OPERAND (ub, 0), 0),
lb, 0))
ub = TREE_OPERAND (ub, 1);
else if (TREE_CODE (ub) == MAX_EXPR
&& TREE_CODE (TREE_OPERAND (ub, 1)) == MINUS_EXPR
&& integer_onep (TREE_OPERAND (TREE_OPERAND (ub, 1), 1))
&& operand_equal_p (TREE_OPERAND (TREE_OPERAND (ub, 1),
0),
lb, 0))
ub = TREE_OPERAND (ub, 0);
length = size_binop (PLUS_EXPR, size_one_node,
size_binop (MINUS_EXPR, ub, lb));
/* If neither bound is a constant and sizetype is signed, make
sure the size is never negative. We should really do this