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GET /api/patches/2216633/?format=api
{ "id": 2216633, "url": "http://patchwork.ozlabs.org/api/patches/2216633/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260327020658.2772689-1-andrew.pinski@oss.qualcomm.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/projects/17/?format=api", "name": "GNU Compiler Collection", "link_name": "gcc", "list_id": "gcc-patches.gcc.gnu.org", "list_email": "gcc-patches@gcc.gnu.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260327020658.2772689-1-andrew.pinski@oss.qualcomm.com>", "list_archive_url": null, "date": "2026-03-27T02:06:58", "name": "regcprop: Return early in maybe_mode_change for unorder modes [PR124649]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c6ab7443d4d6f6b62a3257af520a7c8ed121863b", "submitter": { "id": 91428, "url": "http://patchwork.ozlabs.org/api/people/91428/?format=api", "name": "Andrew Pinski", "email": "andrew.pinski@oss.qualcomm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260327020658.2772689-1-andrew.pinski@oss.qualcomm.com/mbox/", "series": [ { "id": 497677, "url": "http://patchwork.ozlabs.org/api/series/497677/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=497677", "date": "2026-03-27T02:06:58", "name": "regcprop: Return early in maybe_mode_change for unorder modes [PR124649]", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497677/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216633/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216633/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", 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"gcc-patches@gcc.gnu.org", "Cc": "Andrew Pinski <andrew.pinski@oss.qualcomm.com>", "Subject": "[PATCH] regcprop: Return early in maybe_mode_change for unorder modes\n [PR124649]", "Date": "Thu, 26 Mar 2026 19:06:58 -0700", "Message-ID": "<20260327020658.2772689-1-andrew.pinski@oss.qualcomm.com>", "X-Mailer": "git-send-email 2.43.0", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Proofpoint-ORIG-GUID": "kh2hmtkfPrrECpe8RMi7uiSEGUmbInfj", "X-Proofpoint-GUID": "kh2hmtkfPrrECpe8RMi7uiSEGUmbInfj", "X-Authority-Analysis": "v=2.4 cv=CoGys34D c=1 sm=1 tr=0 ts=69c5e649 cx=c_pps\n a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=bSmm+3gfRfB3VWOMdpbB4A==:17\n a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8\n a=a42o5BZ1R8iimRgpAlgA:9 a=uKXjsCUrEbL0IQVhDsJ9:22", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMzI3MDAxNSBTYWx0ZWRfX11wuqIoaF+s7\n 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engine=8.22.0-2603050001\n definitions=main-2603270015", "X-BeenThere": "gcc-patches@gcc.gnu.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<https://gcc.gnu.org/mailman/options/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>", "List-Archive": "<https://gcc.gnu.org/pipermail/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-request@gcc.gnu.org?subject=help>", "List-Subscribe": "<https://gcc.gnu.org/mailman/listinfo/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "Like r16-727-g2ec5082dd24cef but the call to partial_subreg_p happens\nin a later place, maybe_mode_change.\nFor this example we have VNx4QImode and DImode which are not ordered.\n\nBootstrapped and tested on aarch64-linux-gnu.\n\n\tPR rtl-optimization/124649\n\ngcc/ChangeLog:\n\n\t* regcprop.cc (maybe_mode_change): Return early\n\tfor unordered modes.\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.dg/torture/pr124649-1.c: New test.\n\nSigned-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>\n---\n gcc/regcprop.cc | 8 ++++++++\n gcc/testsuite/gcc.dg/torture/pr124649-1.c | 15 +++++++++++++++\n 2 files changed, 23 insertions(+)\n create mode 100644 gcc/testsuite/gcc.dg/torture/pr124649-1.c", "diff": "diff --git a/gcc/regcprop.cc b/gcc/regcprop.cc\nindex b1f00ca0435..2a9956353cc 100644\n--- a/gcc/regcprop.cc\n+++ b/gcc/regcprop.cc\n@@ -431,6 +431,14 @@ maybe_mode_change (machine_mode orig_mode, machine_mode copy_mode,\n \t\t machine_mode new_mode, unsigned int regno,\n \t\t unsigned int copy_regno ATTRIBUTE_UNUSED)\n {\n+ /* All three modes precision have to be ordered to each other,\n+ otherwise partial_subreg_p won't work. */\n+ if (!ordered_p (GET_MODE_PRECISION (orig_mode),\n+\t\t GET_MODE_PRECISION (copy_mode))\n+ || !ordered_p (GET_MODE_PRECISION (copy_mode),\n+\t\t GET_MODE_PRECISION (new_mode)))\n+ return NULL_RTX;\n+\n if (partial_subreg_p (copy_mode, orig_mode)\n && partial_subreg_p (copy_mode, new_mode))\n return NULL_RTX;\ndiff --git a/gcc/testsuite/gcc.dg/torture/pr124649-1.c b/gcc/testsuite/gcc.dg/torture/pr124649-1.c\nnew file mode 100644\nindex 00000000000..4cd84d7c4cf\n--- /dev/null\n+++ b/gcc/testsuite/gcc.dg/torture/pr124649-1.c\n@@ -0,0 +1,15 @@\n+/* PR rtl-optimization/124649 */\n+/* { dg-do compile } */\n+/* { dg-additional-options \"-mcpu=neoverse-v1\" { target aarch64*-*-* } } */\n+\n+void f(char *g, int b) {\n+ int k = b & 4 + 1;\n+ int c[b];\n+ if (k == 1)\n+ b >>= 3;\n+ b &= 1;\n+ c[0] = b;\n+ for (int i = 0; i < k; i++)\n+ g[i] = c[i];\n+}\n+\n", "prefixes": [] }