From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2136) id 2FEE4384D187; Thu, 20 Oct 2022 16:46:48 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2FEE4384D187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1666284408; bh=Onps+efIuXefCu5xYvIstWubGXAxhTC9AVuLc2mYD00=; h=From:To:Subject:Date:From; b=ySXC1Vw0xY4pdrsnNNGEzIqB3GTOiaWp4xAgTcMZ7WzHlj6ZT6DklgtDseeANc7S8 xsE5+XwsHMpGCZ1oeGo5NwDkgN+pSMT6z+fMBHiatYzydFQ96Pj1n6s0oj6amP6Ov3 sPwzX8JfBcPHG100PDaXnaOk2Eq0A7Vwo7A9VoYw= 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 r13-3415] A false UNORDERED_ means neither operand can be a NAN. X-Act-Checkin: gcc X-Git-Author: Aldy Hernandez X-Git-Refname: refs/heads/master X-Git-Oldrev: 9a8b37f5476ba1f92fd9a85add035ace89535e79 X-Git-Newrev: 3dfdc0d1e1c4e00a77f2afc41d577c1b36cb4702 Message-Id: <20221020164648.2FEE4384D187@sourceware.org> Date: Thu, 20 Oct 2022 16:46:48 +0000 (GMT) List-Id: https://gcc.gnu.org/g:3dfdc0d1e1c4e00a77f2afc41d577c1b36cb4702 commit r13-3415-g3dfdc0d1e1c4e00a77f2afc41d577c1b36cb4702 Author: Aldy Hernandez Date: Wed Oct 19 17:14:02 2022 +0200 A false UNORDERED_ means neither operand can be a NAN. The false side of UNORDERED_ means neither operand can be a NAN. Adjust all the op[12]_range entries for the UNORDERED operators such that a known NAN on one operands means the other operands is undefined. gcc/ChangeLog: * range-op-float.cc (foperator_unordered_le::op1_range): Adjust false side with a NAN operand. (foperator_unordered_le::op2_range): Same. (foperator_unordered_gt::op1_range): Same. (foperator_unordered_gt::op2_range): Same. (foperator_unordered_ge::op1_range): Same. (foperator_unordered_ge::op2_range): Same. (foperator_unordered_equal::op1_range): Same. Diff: --- gcc/range-op-float.cc | 51 +++++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 41 insertions(+), 10 deletions(-) diff --git a/gcc/range-op-float.cc b/gcc/range-op-float.cc index a9e74c86877..0cb07c2ec29 100644 --- a/gcc/range-op-float.cc +++ b/gcc/range-op-float.cc @@ -1351,7 +1351,11 @@ foperator_unordered_le::op1_range (frange &r, tree type, break; case BRS_FALSE: - if (build_gt (r, type, op2)) + // A false UNORDERED_LE means both operands are !NAN, so it's + // impossible for op2 to be a NAN. + if (op2.known_isnan ()) + r.set_undefined (); + else if (build_gt (r, type, op2)) r.clear_nan (); break; @@ -1375,7 +1379,11 @@ foperator_unordered_le::op2_range (frange &r, break; case BRS_FALSE: - if (build_lt (r, type, op1)) + // A false UNORDERED_LE means both operands are !NAN, so it's + // impossible for op1 to be a NAN. + if (op1.known_isnan ()) + r.set_undefined (); + else if (build_lt (r, type, op1)) r.clear_nan (); break; @@ -1434,7 +1442,11 @@ foperator_unordered_gt::op1_range (frange &r, break; case BRS_FALSE: - if (build_le (r, type, op2)) + // A false UNORDERED_GT means both operands are !NAN, so it's + // impossible for op2 to be a NAN. + if (op2.known_isnan ()) + r.set_undefined (); + else if (build_le (r, type, op2)) r.clear_nan (); break; @@ -1458,7 +1470,11 @@ foperator_unordered_gt::op2_range (frange &r, break; case BRS_FALSE: - if (build_ge (r, type, op1)) + // A false UNORDERED_GT means both operands are !NAN, so it's + // impossible for op1 to be a NAN. + if (op1.known_isnan ()) + r.set_undefined (); + else if (build_ge (r, type, op1)) r.clear_nan (); break; @@ -1517,7 +1533,11 @@ foperator_unordered_ge::op1_range (frange &r, break; case BRS_FALSE: - if (build_lt (r, type, op2)) + // A false UNORDERED_GE means both operands are !NAN, so it's + // impossible for op2 to be a NAN. + if (op2.known_isnan ()) + r.set_undefined (); + else if (build_lt (r, type, op2)) r.clear_nan (); break; @@ -1540,7 +1560,11 @@ foperator_unordered_ge::op2_range (frange &r, tree type, break; case BRS_FALSE: - if (build_gt (r, type, op1)) + // A false UNORDERED_GE means both operands are !NAN, so it's + // impossible for op1 to be a NAN. + if (op1.known_isnan ()) + r.set_undefined (); + else if (build_gt (r, type, op1)) r.clear_nan (); break; @@ -1606,10 +1630,17 @@ foperator_unordered_equal::op1_range (frange &r, tree type, break; case BRS_FALSE: - // The false side indictates !NAN and not equal. We can at least - // represent !NAN. - r.set_varying (type); - r.clear_nan (); + // A false UNORDERED_EQ means both operands are !NAN, so it's + // impossible for op2 to be a NAN. + if (op2.known_isnan ()) + r.set_undefined (); + else + { + // The false side indictates !NAN and not equal. We can at least + // represent !NAN. + r.set_varying (type); + r.clear_nan (); + } break; default: