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GET /api/patches/2224160/?format=api
{ "id": 2224160, "url": "http://patchwork.ozlabs.org/api/patches/2224160/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260417020830.4154676-2-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": "<20260417020830.4154676-2-andrew.pinski@oss.qualcomm.com>", "list_archive_url": null, "date": "2026-04-17T02:08:30", "name": "[GCC17-PATCH,2/2] phiopt: Allow for more than 2 predecessors for join block for cselim-limited in phiopt [PR123113]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "8d7a94bc6fc2e2df07a3cd90422d6fb071ee443e", "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/20260417020830.4154676-2-andrew.pinski@oss.qualcomm.com/mbox/", "series": [ { "id": 500220, "url": "http://patchwork.ozlabs.org/api/series/500220/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500220", "date": "2026-04-17T02:08:29", "name": "[GCC17-PATCH,1/2] phiopt: Set cfgchanged if cselim-limited happened", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500220/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224160/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224160/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", "gcc-patches@gcc.gnu.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=T123cWb3;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=C2Q6j5yh;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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Since make_forwarder_block\nkeeps around the original bb as new forwarder block, this makes it easier to handle.\nAnd the original phi nodes are also kept around too (though this is not needed\nto be handled for cselim-limited but will be for factoring).\n\nBootstrapped and tested on x86_64-linux-gnu.\n\n\tPR tree-optimization/123113\ngcc/ChangeLog:\n\n\t* tree-ssa-phiopt.cc (edges_split): New function.\n\t(make_forwarder): New function.\n\t(cond_if_else_store_replacement_1): Create the new\n\tforwarder block right before doing the store sinking.\n\t(pass_phiopt::execute): Remove the restriction on cselim_limited\n\tfor 2 predecessors.\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.dg/tree-ssa/ssa-sink-13.c:\n\t* gcc.dg/tree-ssa/cselim-6.c: New test.\n\nSigned-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>\n---\n gcc/testsuite/gcc.dg/tree-ssa/cselim-6.c | 18 +++++++++\n gcc/testsuite/gcc.dg/tree-ssa/ssa-sink-13.c | 2 +-\n gcc/tree-ssa-phiopt.cc | 43 ++++++++++++++++++++-\n 3 files changed, 61 insertions(+), 2 deletions(-)\n create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/cselim-6.c", "diff": "diff --git a/gcc/testsuite/gcc.dg/tree-ssa/cselim-6.c b/gcc/testsuite/gcc.dg/tree-ssa/cselim-6.c\nnew file mode 100644\nindex 00000000000..1f726ccca78\n--- /dev/null\n+++ b/gcc/testsuite/gcc.dg/tree-ssa/cselim-6.c\n@@ -0,0 +1,18 @@\n+/* { dg-do compile } */\n+/* { dg-options \"-O1 -fdump-tree-phiopt1\" } */\n+\n+int t;\n+void f(int a, int b, int c, int d)\n+{\n+ if (a)\n+ {\n+ if (b)\n+ t = c;\n+ else\n+ t = d;\n+ }\n+}\n+\n+/* We should sink/merge the store. */\n+\n+/* { dg-final { scan-tree-dump-times \"t = cstore\" 1 \"phiopt1\" } } */\ndiff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-sink-13.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-sink-13.c\nindex 584fd91f43a..75cb354052b 100644\n--- a/gcc/testsuite/gcc.dg/tree-ssa/ssa-sink-13.c\n+++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-sink-13.c\n@@ -1,6 +1,6 @@\n /* PR33315 */\n /* { dg-do compile } */\n-/* { dg-options \"-O2 -fdump-tree-sink\" } */\n+/* { dg-options \"-O2 -fdump-tree-sink -fno-ssa-phiopt\" } */\n \n int num;\n int a[20];\ndiff --git a/gcc/tree-ssa-phiopt.cc b/gcc/tree-ssa-phiopt.cc\nindex 324559e6a7d..76527ff922c 100644\n--- a/gcc/tree-ssa-phiopt.cc\n+++ b/gcc/tree-ssa-phiopt.cc\n@@ -3115,6 +3115,42 @@ cond_store_replacement (basic_block middle_bb, basic_block join_bb,\n return true;\n }\n \n+/* Callback function for make_forwarder_block,\n+ returns true if the edge src is either of\n+ the 2 basic blocks in the array BBS (DATA). */\n+\n+static bool\n+edges_split (edge e, void *data)\n+{\n+ basic_block *bbs = (basic_block*)data;\n+ return e->src == bbs[0] || e->src == bbs[1];\n+}\n+\n+\n+/* Makes a forwarder block for JOIN_BB such that\n+ THEN_BB and ELSE_BB are the only 2 predecessors\n+ of the block. Note the JOIN_BB is required to be\n+ the same and the PHI nodes of JOIN_BB have to be\n+ the same too. */\n+\n+static void\n+make_forwarder (basic_block then_bb, basic_block else_bb,\n+\t\tbasic_block join_bb)\n+{\n+ basic_block bbs[2];\n+\n+ /* If the join block already has 2 predecessors, then there\n+ is nothing to be done. */\n+ if (EDGE_COUNT (join_bb->preds) == 2)\n+ return;\n+ bbs[0] = then_bb;\n+ bbs[1] = else_bb;\n+ edge ne = make_forwarder_block (join_bb, edges_split, bbs);\n+ gcc_assert (join_bb == ne->src);\n+ statistics_counter_event (cfun, \"if-then-else split for inserting common\", 1);\n+}\n+\n+\n /* Do the main work of conditional store replacement. */\n \n static bool\n@@ -3201,6 +3237,11 @@ cond_if_else_store_replacement_1 (basic_block then_bb, basic_block else_bb,\n gsi_remove (&gsi, true);\n release_defs (else_assign);\n \n+ /* If the join bb has more than 2 predecessors,\n+ then we need to create a new join. */\n+ if (EDGE_COUNT (join_bb->preds) != 2)\n+ make_forwarder (then_bb, else_bb, join_bb);\n+\n /* 2) Create a PHI node at the join block, with one argument\n \tholding the old RHS, and the other holding the temporary\n \twhere we stored the old memory contents. */\n@@ -4050,7 +4091,7 @@ pass_phiopt::execute (function *)\n \t /* Try to see if there are only store in each side of the if\n \t and try to remove that; don't do this for -Og.\n \t With sinking the stores we might end up with empty blocks. */\n-\t if (EDGE_COUNT (bb3->preds) == 2 && !optimize_debug)\n+\t if (!optimize_debug)\n \t while (cond_if_else_store_replacement_limited (bb1, bb2, bb3))\n \t cfgchanged = true;\n \t}\n", "prefixes": [ "GCC17-PATCH", "2/2" ] }