From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2136) id CB8F13857346; Wed, 5 Oct 2022 12:22:50 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CB8F13857346 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1664972570; bh=J18VlC7udbBThoIuWNTwhbKPKAqG/B0e8hpDPP0q538=; h=From:To:Subject:Date:From; b=OBQmRpUNlQfjIqBYcsaON1HrbJEBdQvjktrzEnWCpoWEshU+XM5M8gVxUeFKlvmHx YM+rmZxWYz6z16RygKDpqDT564EENk1fj1ZwGzKhQ/C5AAF81cV8hbzreqDDPmQwWY 0e7+rEMWvtlx0gb6VNkEh017+qYmscoyQ/wBZxnI= MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Aldy Hernandez To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-3085] [PR tree-optimization/107052] range-ops: Pass nonzero masks through cast. X-Act-Checkin: gcc X-Git-Author: Aldy Hernandez X-Git-Refname: refs/heads/master X-Git-Oldrev: 853ce8eea4ff97850a987167e603387b3d0f1401 X-Git-Newrev: ae56d600d223e996054483d7d7033ec8e258d39d Message-Id: <20221005122250.CB8F13857346@sourceware.org> Date: Wed, 5 Oct 2022 12:22:50 +0000 (GMT) List-Id: https://gcc.gnu.org/g:ae56d600d223e996054483d7d7033ec8e258d39d commit r13-3085-gae56d600d223e996054483d7d7033ec8e258d39d Author: Aldy Hernandez Date: Tue Oct 4 17:03:54 2022 +0200 [PR tree-optimization/107052] range-ops: Pass nonzero masks through cast. Track nonzero masks through a cast in range-ops. PR tree-optimization/107052 gcc/ChangeLog: * range-op.cc (operator_cast::fold_range): Set nonzero mask. Diff: --- gcc/range-op.cc | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/gcc/range-op.cc b/gcc/range-op.cc index 4f647abd91c..6fa27a8904e 100644 --- a/gcc/range-op.cc +++ b/gcc/range-op.cc @@ -2515,6 +2515,14 @@ operator_cast::fold_range (irange &r, tree type ATTRIBUTE_UNUSED, if (r.varying_p ()) return true; } + + // Pass nonzero mask through the cast. + if (!truncating_cast_p (inner, outer)) + { + wide_int nz = inner.get_nonzero_bits (); + nz = wide_int::from (nz, TYPE_PRECISION (type), TYPE_SIGN (inner.type ())); + r.set_nonzero_bits (nz); + } return true; }