- /* Change X >= C to X > (C - 1) and X < C to X <= (C - 1) if C > 0.
- This transformation affects the cases which are handled in later
- optimizations involving comparisons with non-negative constants. */
- if (TREE_CODE (arg1) == INTEGER_CST
- && TREE_CODE (arg0) != INTEGER_CST
- && tree_int_cst_sgn (arg1) > 0)
- {
- if (code == GE_EXPR)
- {
- arg1 = const_binop (MINUS_EXPR, arg1,
- build_int_cst (TREE_TYPE (arg1), 1), 0);
- return fold_build2 (GT_EXPR, type, arg0,
- fold_convert (TREE_TYPE (arg0), arg1));
- }
- if (code == LT_EXPR)
- {
- arg1 = const_binop (MINUS_EXPR, arg1,
- build_int_cst (TREE_TYPE (arg1), 1), 0);
- return fold_build2 (LE_EXPR, type, arg0,
- fold_convert (TREE_TYPE (arg0), arg1));
- }
- }
-