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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Dell.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DS7PR19MB4501.namprd19.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2a0b133d-beaf-4301-290f-08daae03e5ab X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Oct 2022 16:48:18.7524 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 945c199a-83a2-4e80-9f8c-5a91be5752dd X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: UvSCwQT4No476PomELmq0QTtDLhy+gQp+HfHJq4NLP3leYTPsS9hapAZbbdcgC8CmnS2KVg770kZJC1tuoOJKg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR19MB4034 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-14_09,2022-10-14_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 mlxlogscore=759 spamscore=0 adultscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210140093 X-Proofpoint-GUID: JO0v8WvvikyTSwAX6Mqq0DFFMVIpT3g0 X-Proofpoint-ORIG-GUID: JO0v8WvvikyTSwAX6Mqq0DFFMVIpT3g0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 spamscore=0 adultscore=0 suspectscore=0 mlxscore=0 mlxlogscore=880 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210140093 X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: > On Oct 14, 2022, at 12:18 PM, Segher Boessenkool wrote: >=20 > On Fri, Oct 14, 2022 at 12:36:47AM +0000, Koning, Paul wrote: >> I guess I'll have to look harder to see if it's possible to make LRA han= dle CISC addressing modes like memory indirect, autoincrement, autodecremen= t, and others that the old reload handles at least somewhat. Ideally LRA s= hould do a better job; right now I believe it doesn't really do these thing= s at all. Targets like pdp11 and vax would like these. >=20 > So what does it do now? Break every more complex addressing mode apart > again? Or ICE? Or something in between? The former. LRA does handle some cases but not all that the target permits= and not as many as the old reload. Example: unsigned int cksum (unsigned int *buf, unsigned int len) { unsigned int ret =3D 0; do { ret +=3D *buf++; } while (--len !=3D 0); return ret; } The loop looks like this: L_2: add (r2)+,r0 sob r1,L_2 which is what I would expect. Now throw in an indirection: Old reload produces this loop: L_2: add @(r2)+,r0 sob r1,L_2 while LRA doesn't understand it can use the autoincrement indirect mode: L_2: mov (r2)+,r3 add (r3),r0 sob r1,L_2 This is from a GCC 13.0 test build of last June, with -O2 -m45, with and wi= thout -mlra. paul