From 70a9e64b3cc4c27d53dd895e5318cae00245b22c Mon Sep 17 00:00:00 2001 From: Andrew Pinski Date: Sat, 2 Jul 2005 16:24:31 +0000 Subject: re PR tree-optimization/14490 ([tree-ssa] Simplify "a - 10 > 150" into "a > 160") 2005-07-02 Andrew Pinski PR middle-end/14490 * fold-const.c (fold_binary): Handle the return value of fold_to_nonsharp_ineq_using_bound if we get back the same operand back. Implement "X +- C1 CMP C2" folding to "X CMP C2 -+ C1". From-SVN: r101535 --- gcc/fold-const.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) (limited to 'gcc/fold-const.c') diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 564cec3..682ae00 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -8575,11 +8575,11 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1) && !TREE_SIDE_EFFECTS (arg1)) { tem = fold_to_nonsharp_ineq_using_bound (arg0, arg1); - if (tem) + if (tem && !operand_equal_p (tem, arg0, 0)) return fold_build2 (code, type, tem, arg1); tem = fold_to_nonsharp_ineq_using_bound (arg1, arg0); - if (tem) + if (tem && !operand_equal_p (tem, arg1, 0)) return fold_build2 (code, type, arg0, tem); } @@ -8865,6 +8865,30 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1) } } + /* Transform comparisons of the form X +- C1 CMP C2 to X CMP C2 +- C1. */ + if ((TREE_CODE (arg0) == PLUS_EXPR || TREE_CODE (arg0) == MINUS_EXPR) + && (TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST + && !TREE_OVERFLOW (TREE_OPERAND (arg0, 1)) + && !TYPE_UNSIGNED (TREE_TYPE (arg1)) + && !(flag_wrapv || flag_trapv)) + && (TREE_CODE (arg1) == INTEGER_CST + && !TREE_OVERFLOW (arg1))) + { + tree const1 = TREE_OPERAND (arg0, 1); + tree const2 = arg1; + tree variable = TREE_OPERAND (arg0, 0); + tree lhs; + int lhs_add; + lhs_add = TREE_CODE (arg0) != PLUS_EXPR; + + lhs = fold_build2 (lhs_add ? PLUS_EXPR : MINUS_EXPR, + TREE_TYPE (arg1), const2, const1); + if (TREE_CODE (lhs) == TREE_CODE (arg1) + && (TREE_CODE (lhs) != INTEGER_CST + || !TREE_OVERFLOW (lhs))) + return fold_build2 (code, type, variable, lhs); + } + if (FLOAT_TYPE_P (TREE_TYPE (arg0))) { tree targ0 = strip_float_extensions (arg0); -- cgit v1.1