From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1011) id 293E3385D0CD; Wed, 26 Oct 2022 13:49:11 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 293E3385D0CD DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1666792151; bh=nRhwMxB/dl+csLigvyNCnEa4XQpL0dNLclDfs2ZFZGo=; h=From:To:Subject:Date:From; b=yuaobKSNozX8GqH8FRf/kLjtNItJ4eeDwZCwigI5eQQ40QY1DJZTc00G/4cBTt+GF dIFmtfp5ak5t4+P8jH6pP7yWCmcC3eDypswJVTYpIK7oUC6InmEVTNBKDBuFdPkoD1 n+xeuZ/0C6HLbM2D3CMccZ81H7bNUt5Za7x1cfcM= MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Andrew Macleod To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-3508] Check if varying may also be non-negative. X-Act-Checkin: gcc X-Git-Author: Andrew MacLeod X-Git-Refname: refs/heads/master X-Git-Oldrev: d80b7744c6ae6f6d8ca1f56982a50d1888b8279f X-Git-Newrev: a87819b8f1b890d36a3f05bd9de80be20e9525dd Message-Id: <20221026134911.293E3385D0CD@sourceware.org> Date: Wed, 26 Oct 2022 13:49:11 +0000 (GMT) List-Id: https://gcc.gnu.org/g:a87819b8f1b890d36a3f05bd9de80be20e9525dd commit r13-3508-ga87819b8f1b890d36a3f05bd9de80be20e9525dd Author: Andrew MacLeod Date: Tue Oct 25 15:16:47 2022 -0400 Check if varying may also be non-negative. When using strict enums, we can sometimes turn varying into a better range. * gimple-range-fold.cc (fold_using_range::fold_stmt): Check if stmt is non-negative and adjust the range. Diff: --- gcc/gimple-range-fold.cc | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc index f91923782dc..a899d8260b3 100644 --- a/gcc/gimple-range-fold.cc +++ b/gcc/gimple-range-fold.cc @@ -494,6 +494,14 @@ fold_using_range::fold_stmt (vrange &r, gimple *s, fur_source &src, tree name) else if (is_a (s) && gimple_assign_rhs_code (s) == COND_EXPR) res = range_of_cond_expr (r, as_a (s), src); + // If the result is varying, check for basic nonnegativeness. + // Specifically this helps for now with strict enum in cases like + // g++.dg/warn/pr33738.C. + bool so_p; + if (res && r.varying_p () && INTEGRAL_TYPE_P (r.type ()) + && gimple_stmt_nonnegative_warnv_p (s, &so_p)) + r.set_nonnegative (r.type ()); + if (!res) { // If no name specified or range is unsupported, bail.