[{"id":3681749,"web_url":"http://patchwork.ozlabs.org/comment/3681749/","msgid":"","list_archive_url":null,"date":"2026-04-24T02:56:34","subject":"Re: [PATCH] RISC-V: Use long jump for crossing section boundaries","submitter":{"id":61252,"url":"http://patchwork.ozlabs.org/api/people/61252/","name":"Kito Cheng","email":"kito.cheng@gmail.com"},"content":"This should be less controversial, also this patch has stabilized\nwithin our internal tree for several months, so I will commit ahead\nonce CI pass :)\n\nKito Cheng 於 2026年4月24日週五 上午10:55寫道：\n>\n> From: Monk Chiang \n>\n> When -freorder-blocks-and-partition is used, GCC places cold code in\n> .text.unlikely section. Jumps from hot code (.text) to cold code\n> (.text.unlikely) may cross section boundaries. Since the linker may\n> place these sections more than 1MB apart, the JAL instruction's ±1MB\n> range can be exceeded, causing linker errors like:\n>\n> relocation truncated to fit: R_RISCV_JAL against `.text.unlikely'\n>\n> This patch fixes the issue by checking CROSSING_JUMP_P in the length\n> attribute calculation for jump instructions. When a jump crosses\n> section boundaries, the length is set to 8 bytes (AUIPC+JALR) instead\n> of 4 bytes (JAL), ensuring the long form is used.\n>\n> This approach is consistent with other backends (NDS32, SH, ARC) that\n> also use CROSSING_JUMP_P to handle cross-section jumps.\n>\n> gcc/ChangeLog:\n>\n> * config/riscv/riscv.md (length attribute): Check CROSSING_JUMP_P\n> for jump instructions and use length 8 for crossing jumps.\n> (jump): Update comment to explain when long form is used.\n>\n> gcc/testsuite/ChangeLog:\n>\n> * gcc.target/riscv/pr-crossing-jump-1.c: New test.\n> * gcc.target/riscv/pr-crossing-jump-2.c: New test.\n> * gcc.target/riscv/pr-crossing-jump-3.c: New test.\n> ---\n> gcc/config/riscv/riscv.md | 23 ++++++----\n> .../gcc.target/riscv/pr-crossing-jump-1.c | 41 +++++++++++++++++\n> .../gcc.target/riscv/pr-crossing-jump-2.c | 45 +++++++++++++++++++\n> .../gcc.target/riscv/pr-crossing-jump-3.c | 33 ++++++++++++++\n> 4 files changed, 134 insertions(+), 8 deletions(-)\n> create mode 100644 gcc/testsuite/gcc.target/riscv/pr-crossing-jump-1.c\n> create mode 100644 gcc/testsuite/gcc.target/riscv/pr-crossing-jump-2.c\n> create mode 100644 gcc/testsuite/gcc.target/riscv/pr-crossing-jump-3.c\n>\n> diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md\n> index 7ea6ee704c3..8803eec075e 100644\n> --- a/gcc/config/riscv/riscv.md\n> +++ b/gcc/config/riscv/riscv.md\n> @@ -630,13 +630,18 @@ (define_attr \"length\" \"\"\n> (const_int 12)))\n>\n> ;; Jumps further than +/- 1 MiB require two instructions.\n> + ;; Also, jumps that cross section boundaries (e.g., from hot to cold\n> + ;; section when -freorder-blocks-and-partition is used) require two\n> + ;; instructions because the linker may place the sections far apart.\n> (eq_attr \"type\" \"jump\")\n> - (if_then_else (and (le (minus (match_dup 0) (pc))\n> - (const_int 1048568))\n> - (le (minus (pc) (match_dup 0))\n> - (const_int 1048572)))\n> - (const_int 4)\n> - (const_int 8))\n> + (if_then_else (match_test \"CROSSING_JUMP_P (insn)\")\n> + (const_int 8)\n> + (if_then_else (and (le (minus (match_dup 0) (pc))\n> + (const_int 1048568))\n> + (le (minus (pc) (match_dup 0))\n> + (const_int 1048572)))\n> + (const_int 4)\n> + (const_int 8)))\n>\n> ;; Conservatively assume calls take two instructions (AUIPC + JALR).\n> ;; The linker will opportunistically relax the sequence to JAL.\n> @@ -3822,8 +3827,10 @@ (define_insn \"jump\"\n> [(set (pc) (label_ref (match_operand 0 \"\" \"\")))]\n> \"\"\n> {\n> - /* Hopefully this does not happen often as this is going\n> - to clobber $ra and muck up the return stack predictors. */\n> + /* Use the long form (AUIPC+JALR) if the jump distance exceeds 1 MiB,\n> + or if the jump crosses section boundaries (e.g., from hot to cold\n> + section when -freorder-blocks-and-partition is used).\n> + Note: This clobbers $ra and mucks up the return stack predictors. */\n> if (get_attr_length (insn) == 8)\n> return \"jump\\t%l0,ra\";\n>\n> diff --git a/gcc/testsuite/gcc.target/riscv/pr-crossing-jump-1.c b/gcc/testsuite/gcc.target/riscv/pr-crossing-jump-1.c\n> new file mode 100644\n> index 00000000000..88def7ce545\n> --- /dev/null\n> +++ b/gcc/testsuite/gcc.target/riscv/pr-crossing-jump-1.c\n> @@ -0,0 +1,41 @@\n> +/* Test that jumps crossing section boundaries use the long form (AUIPC+JALR).\n> + When -freorder-blocks-and-partition is used, cold code is placed in\n> + .text.unlikely section. Jumps from hot code (.text) to cold code\n> + (.text.unlikely) must use the long form because the linker may place\n> + these sections more than 1MB apart, exceeding the JAL instruction's range.\n> +\n> + This test verifies that CROSSING_JUMP_P is handled correctly in the\n> + RISC-V backend. */\n> +\n> +/* { dg-do compile } */\n> +/* { dg-require-effective-target freorder } */\n> +/* { dg-options \"-O2 -freorder-blocks-and-partition\" } */\n> +\n> +extern void abort (void);\n> +\n> +/* Force the error path to be cold. */\n> +static void __attribute__((cold, noinline))\n> +handle_error (void)\n> +{\n> + abort ();\n> +}\n> +\n> +/* Function with hot and cold paths. */\n> +int\n> +check_positive (int x)\n> +{\n> + if (__builtin_expect (x > 0, 1))\n> + {\n> + /* Hot path - stays in .text */\n> + return x;\n> + }\n> + /* Cold path - moved to .text.unlikely */\n> + handle_error ();\n> + return -1;\n> +}\n> +\n> +/* The jump to the cold section should use \"jump\" (AUIPC+JALR) not \"j\" (JAL).\n> + We check for \"jump\" instruction which is the long form. */\n> +\n> +/* { dg-final { scan-assembler \"jump\\\\t\\\\.L\\[0-9\\]+,ra\" } } */\n> +\n> diff --git a/gcc/testsuite/gcc.target/riscv/pr-crossing-jump-2.c b/gcc/testsuite/gcc.target/riscv/pr-crossing-jump-2.c\n> new file mode 100644\n> index 00000000000..f2e7c55014d\n> --- /dev/null\n> +++ b/gcc/testsuite/gcc.target/riscv/pr-crossing-jump-2.c\n> @@ -0,0 +1,45 @@\n> +/* Test that multiple crossing jumps all use the long form.\n> + This is a more comprehensive test for CROSSING_JUMP_P handling. */\n> +\n> +/* { dg-do compile } */\n> +/* { dg-require-effective-target freorder } */\n> +/* { dg-options \"-O2 -freorder-blocks-and-partition\" } */\n> +\n> +extern void abort (void);\n> +\n> +static void __attribute__((cold, noinline))\n> +cold_path_1 (void)\n> +{\n> + abort ();\n> +}\n> +\n> +static void __attribute__((cold, noinline))\n> +cold_path_2 (void)\n> +{\n> + abort ();\n> +}\n> +\n> +/* Function with multiple cold paths. */\n> +int\n> +validate (int a, int b)\n> +{\n> + if (__builtin_expect (a > 0, 1))\n> + {\n> + if (__builtin_expect (b > 0, 1))\n> + {\n> + /* Hot path */\n> + return a + b;\n> + }\n> + /* Cold path 1 */\n> + cold_path_1 ();\n> + }\n> + /* Cold path 2 */\n> + cold_path_2 ();\n> + return -1;\n> +}\n> +\n> +/* All jumps to cold sections should use \"jump\" (AUIPC+JALR).\n> + We expect at least 2 crossing jumps. */\n> +\n> +/* { dg-final { scan-assembler-times \"jump\\\\t\\\\.L\\[0-9\\]+,ra\" 2 } } */\n> +\n> diff --git a/gcc/testsuite/gcc.target/riscv/pr-crossing-jump-3.c b/gcc/testsuite/gcc.target/riscv/pr-crossing-jump-3.c\n> new file mode 100644\n> index 00000000000..d594488e222\n> --- /dev/null\n> +++ b/gcc/testsuite/gcc.target/riscv/pr-crossing-jump-3.c\n> @@ -0,0 +1,33 @@\n> +/* Test that jumps within the same section still use the short form (JAL).\n> + This ensures that the CROSSING_JUMP_P fix doesn't pessimize normal jumps. */\n> +\n> +/* { dg-do compile } */\n> +/* { dg-options \"-O2\" } */\n> +\n> +int global;\n> +\n> +/* Simple function with a loop - jumps stay within .text section. */\n> +int\n> +sum_to_n (int n)\n> +{\n> + int sum = 0;\n> + for (int i = 1; i <= n; i++)\n> + sum += i;\n> + return sum;\n> +}\n> +\n> +/* Function with conditional - jumps stay within .text section. */\n> +int\n> +abs_value (int x)\n> +{\n> + if (x < 0)\n> + return -x;\n> + return x;\n> +}\n> +\n> +/* The backward jump in the loop should use \"j\" (JAL) not \"jump\" (AUIPC+JALR)\n> + since it doesn't cross section boundaries. We verify that \"jump\" is NOT\n> + used for intra-section jumps. */\n> +\n> +/* { dg-final { scan-assembler-not \"jump\\\\t\\\\.L\\[0-9\\]+,ra\" } } */\n> +\n> --\n> 2.52.0\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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=GVlSny+N;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org;\n\tdkim=pass (2048-bit key,\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=GVlSny+N","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; 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Thu, 23 Apr 2026\n 19:56:46 -0700 (PDT)","MIME-Version":"1.0","References":"<20260424025503.2589107-1-kito.cheng@sifive.com>","In-Reply-To":"<20260424025503.2589107-1-kito.cheng@sifive.com>","From":"Kito Cheng ","Date":"Fri, 24 Apr 2026 10:56:34 +0800","X-Gm-Features":"AQROBzDX7pQmEOfYlUNr0cFvOgC135bKY8RdE02fTEIiGOFIFnL4HRKXL2umFBA","Message-ID":"\n ","Subject":"Re: [PATCH] RISC-V: Use long jump for crossing section boundaries","To":"Kito Cheng ","Cc":"gcc-patches@gcc.gnu.org, jeffreyalaw@gmail.com,\n Monk Chiang ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3682039,"web_url":"http://patchwork.ozlabs.org/comment/3682039/","msgid":"","list_archive_url":null,"date":"2026-04-24T13:45:31","subject":"Re: [PATCH] RISC-V: Use long jump for crossing section boundaries","submitter":{"id":92310,"url":"http://patchwork.ozlabs.org/api/people/92310/","name":"Jeffrey Law","email":"jeffrey.law@oss.qualcomm.com"},"content":"On 4/23/2026 8:56 PM, Kito Cheng wrote:\n> This should be less controversial, also this patch has stabilized\n> within our internal tree for several months, so I will commit ahead\n> once CI pass :)\nJust a note, the failures in the pre-commit CI system aren't related to \nyour patch; there's a glitch that was in the tree briefly which made the \nieee.exp tests unstable.\n\n\nJeff","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=dlQPCINI;\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=bKhnQmUk;\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; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.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=dlQPCINI;\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=bKhnQmUk","sourceware.org; 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