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(fold_range_test, fold): Avoid making SAVE_EXPR if at top level.

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From-SVN: r14541
This commit is contained in:
Richard Kenner 1997-07-27 19:35:53 -04:00
parent d0977240cb
commit f0eebf28c4
1 changed files with 17 additions and 11 deletions

28
gcc/fold-const.c

@ -3106,13 +3106,15 @@ fold_range_test (exp)
|| TREE_CODE (exp) == TRUTH_ORIF_EXPR)
&& operand_equal_p (lhs, rhs, 0))
{
/* If simple enough, just rewrite. Otherwise, make a SAVE_EXPR. */
/* If simple enough, just rewrite. Otherwise, make a SAVE_EXPR
unless we are at top level, in which case we can't do this. */
if (simple_operand_p (lhs))
return build (TREE_CODE (exp) == TRUTH_ANDIF_EXPR
? TRUTH_AND_EXPR : TRUTH_OR_EXPR,
TREE_TYPE (exp), TREE_OPERAND (exp, 0),
TREE_OPERAND (exp, 1));
else
else if (current_function_decl != 0)
{
tree common = save_expr (lhs);
@ -3764,9 +3766,10 @@ fold (expr)
return build (COMPOUND_EXPR, type, TREE_OPERAND (arg1, 0),
fold (build (code, type,
arg0, TREE_OPERAND (arg1, 1))));
else if (TREE_CODE (arg1) == COND_EXPR
|| (TREE_CODE_CLASS (TREE_CODE (arg1)) == '<'
&& TREE_CODE_CLASS (code) != '<'))
else if ((TREE_CODE (arg1) == COND_EXPR
|| (TREE_CODE_CLASS (TREE_CODE (arg1)) == '<'
&& TREE_CODE_CLASS (code) != '<'))
&& (! TREE_SIDE_EFFECTS (arg0) || current_function_decl != 0))
{
tree test, true_value, false_value;
@ -3804,7 +3807,8 @@ fold (expr)
if (TREE_CONSTANT (lhs) || TREE_CONSTANT (rhs))
return fold (build (COND_EXPR, type, test, lhs, rhs));
arg0 = save_expr (arg0);
if (current_function_decl != 0)
arg0 = save_expr (arg0);
}
test = fold (build (COND_EXPR, type, test,
@ -3821,9 +3825,10 @@ fold (expr)
else if (TREE_CODE (arg0) == COMPOUND_EXPR)
return build (COMPOUND_EXPR, type, TREE_OPERAND (arg0, 0),
fold (build (code, type, TREE_OPERAND (arg0, 1), arg1)));
else if (TREE_CODE (arg0) == COND_EXPR
|| (TREE_CODE_CLASS (TREE_CODE (arg0)) == '<'
&& TREE_CODE_CLASS (code) != '<'))
else if ((TREE_CODE (arg0) == COND_EXPR
|| (TREE_CODE_CLASS (TREE_CODE (arg0)) == '<'
&& TREE_CODE_CLASS (code) != '<'))
&& (! TREE_SIDE_EFFECTS (arg1) || current_function_decl != 0))
{
tree test, true_value, false_value;
@ -3853,7 +3858,8 @@ fold (expr)
|| TREE_CONSTANT (arg1))
return fold (build (COND_EXPR, type, test, lhs, rhs));
arg1 = save_expr (arg1);
if (current_function_decl != 0)
arg1 = save_expr (arg1);
}
test = fold (build (COND_EXPR, type, test,
@ -4374,7 +4380,7 @@ fold (expr)
if (real_onep (arg1))
return non_lvalue (convert (type, arg0));
/* x*2 is x+x */
if (! wins && real_twop (arg1))
if (! wins && real_twop (arg1) && current_function_decl != 0)
{
tree arg = save_expr (arg0);
return build (PLUS_EXPR, type, arg, arg);