[{"id":3678932,"web_url":"http://patchwork.ozlabs.org/comment/3678932/","msgid":"","list_archive_url":null,"date":"2026-04-18T00:49:55","subject":"Re: [PATCH 7/7] Output mode switching transitions to dump file","submitter":{"id":91428,"url":"http://patchwork.ozlabs.org/api/people/91428/","name":"Andrew Pinski","email":"andrew.pinski@oss.qualcomm.com"},"content":"On Fri, Apr 17, 2026 at 5:32 PM Alice Carlotti wrote:\n>\n>\n> gcc/ChangeLog:\n>\n> * mode-switching.cc (optimize_mode_switching): Add dump output.\n\nOk, with just a little more in the commit message :). Something like:\nWhile debugging mode switching, I found it useful to dump a few things.\nAnd this adds that.\n\nThanks,\nAndrea\n\n>\n>\n> diff --git a/gcc/mode-switching.cc b/gcc/mode-switching.cc\n> index d5bbecf747a47162e261d00a12dbd0ecead2ecd2..60f0e9d986eaef88294a3fe0c584bb4be8c757aa 100644\n> --- a/gcc/mode-switching.cc\n> +++ b/gcc/mode-switching.cc\n> @@ -1109,6 +1109,9 @@ optimize_mode_switching (void)\n> bitmap_clear (jumping_blocks);\n> for (j = n_entities - 1; j >= 0; j--)\n> {\n> + if (dump_file)\n> + fprintf (dump_file, \"Mode switching transitions for entity %d:\\n\", j);\n> +\n> int no_mode = num_modes[entity_map[j]];\n> struct bb_info *info = bb_info[j];\n>\n> @@ -1213,6 +1216,11 @@ optimize_mode_switching (void)\n> cur_mode, ptr->regs_live);\n> mode_set = end_sequence ();\n>\n> + if (dump_file)\n> + fprintf(dump_file,\n> + \"Transition %d --> %d at instruction %d.\\n\",\n> + cur_mode, ptr->mode, INSN_UID (ptr->insn_ptr));\n> +\n> /* Insert MODE_SET only if it is nonempty. */\n> if (mode_set != NULL_RTX)\n> {","headers":{"Return-Path":"","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=DmseOHWW;\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=MlD6jttn;\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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