{"id":2232090,"url":"http://patchwork.ozlabs.org/api/patches/2232090/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/20260502145124.3763322-1-xry111@xry111.site/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/projects/17/?format=json","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":"<20260502145124.3763322-1-xry111@xry111.site>","list_archive_url":null,"date":"2026-05-02T14:51:10","name":"LoongArch: add spaceship expanders","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"d99bac77db5c901691d06d9bf054bdcab03fd8eb","submitter":{"id":84026,"url":"http://patchwork.ozlabs.org/api/people/84026/?format=json","name":"Xi Ruoyao","email":"xry111@xry111.site"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/20260502145124.3763322-1-xry111@xry111.site/mbox/","series":[{"id":502537,"url":"http://patchwork.ozlabs.org/api/series/502537/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=502537","date":"2026-05-02T14:51:10","name":"LoongArch: add spaceship expanders","version":1,"mbox":"http://patchwork.ozlabs.org/series/502537/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2232090/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2232090/checks/","tags":{},"related":[],"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 (1024-bit key;\n unprotected) header.d=xry111.site header.i=@xry111.site header.a=rsa-sha256\n header.s=default header.b=mveL219s;\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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a=rsa-sha256; d=sourceware.org; s=key;\n t=1777733538; c=relaxed/simple;\n bh=AFVj3v5tZy57Rbuh18Ja7CjsvsgANIZyYApcJ+nvbPw=;\n h=DKIM-Signature:From:To:Subject:Date:Message-ID:MIME-Version;\n b=WLNfAH998T6+VH9589gn83tAwrXs9IGEH/QeZ41cYtcNZgZCP8+G3ERZv425GeuqOosr8T18r188RgA4yPPNM6YNFzD9LToP0rPF5R/4AKo3gV2i88xJotq8sZwMlzo5xvT0b4TrjOHQCc+6ar/1ettn2upKSFbaX8A7J6/D9cc=","ARC-Authentication-Results":"i=1; server2.sourceware.org","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=xry111.site;\n s=default; t=1777733507;\n bh=DDO5iQRQAWbaxEyi1Czk82KvfxYMnLhSFXdSU+hKrhg=;\n h=From:To:Cc:Subject:Date:From;\n b=mveL219sxlVK3AgX7sFIAsCyP31CQn+HwAUhioXH6bEl6OTwJsJjINXoTrvrARsoo\n dvLIcGD82w3UVIf4C3qR9UZrOCakn0DNj7ASXF33rs0Cn/7dRbGQ04/gHmxn3gGrat\n fv1IyJT8UoCQCbo/TsBuKWll3A5g8dLqwqmA2AjU=","From":"Xi Ruoyao ","To":"gcc-patches@gcc.gnu.org","Cc":"Lulu Cheng , WANG Xuerui ,\n Mingcong Bai , Zixing Liu ,\n Xi Ruoyao ","Subject":"[PATCH] LoongArch: add spaceship expanders","Date":"Sat, 2 May 2026 22:51:10 +0800","Message-ID":"<20260502145124.3763322-1-xry111@xry111.site>","X-Mailer":"git-send-email 2.54.0","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","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"},"content":"This helps to optimize certain nested ternary operation producing -1, 0,\nor 1 to slt[u]-slt[u]-sub.\n\ngcc/\n\n\t* config/loongarch/loongarch.md (spaceship4): New\n\tdefine_expand.\n\ngcc/testsuite/\n\n\t* gcc.target/loongarch/la64/spaceship.c: New test.\n---\n\nBootstrapped and regtested on loongarch64-linux-gnu. Ok for trunk?\n\n gcc/config/loongarch/loongarch.md | 41 ++++++++++\n .../gcc.target/loongarch/la64/spaceship.c | 79 +++++++++++++++++++\n 2 files changed, 120 insertions(+)\n create mode 100644 gcc/testsuite/gcc.target/loongarch/la64/spaceship.c","diff":"diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md\nindex f8693b7f593..1732e7c7d32 100644\n--- a/gcc/config/loongarch/loongarch.md\n+++ b/gcc/config/loongarch/loongarch.md\n@@ -3798,6 +3798,47 @@ (define_insn \"*sle_\"\n [(set_attr \"type\" \"slt\")\n (set_attr \"mode\" \"\")])\n \n+(define_expand \"spaceship4\"\n+ [(match_operand:SI 0 \"register_operand\")\n+ (match_operand:QHWD 1 \"register_operand\")\n+ (match_operand:QHWD 2 \"reg_or_0_operand\")\n+ (match_operand:SI 3 \"const_int_operand\")]\n+ \"\"\n+{\n+ gcc_assert (operands[3] == const1_rtx || operands[3] == constm1_rtx);\n+\n+ if (GET_MODE_SIZE (mode) < GET_MODE_SIZE (word_mode))\n+ {\n+ auto extend = (operands[3] == const1_rtx ? ZERO_EXTEND\n+\t\t\t\t\t : SIGN_EXTEND);\n+ for (int i: {1, 2})\n+\tif (operands[i] != const0_rtx)\n+\t operands[i] = force_reg (word_mode,\n+\t\t\t\t gen_rtx_fmt_e (extend, word_mode,\n+\t\t\t\t\t\t operands[i]));\n+ }\n+\n+ auto lt_code = (operands[3] == const1_rtx ? LTU : LT);\n+ auto gt_code = (operands[3] == const1_rtx ? GTU : GT);\n+ rtx lt = gen_rtx_fmt_ee (lt_code, word_mode, operands[1], operands[2]);\n+ rtx gt = gen_rtx_fmt_ee (gt_code, word_mode, operands[1], operands[2]);\n+\n+ gt = force_reg (word_mode, gt);\n+ lt = force_reg (word_mode, lt);\n+\n+ rtx diff = gen_rtx_MINUS (word_mode, gt, lt);\n+ if (TARGET_64BIT)\n+ {\n+ diff = force_reg (DImode, diff);\n+ diff = gen_lowpart (SImode, diff);\n+ SUBREG_PROMOTED_VAR_P (diff) = 1;\n+ SUBREG_PROMOTED_SET (diff, SRP_SIGNED_AND_UNSIGNED);\n+ }\n+\n+ emit_move_insn (operands[0], diff);\n+ DONE;\n+})\n+\n \f\n ;;\n ;; ....................\ndiff --git a/gcc/testsuite/gcc.target/loongarch/la64/spaceship.c b/gcc/testsuite/gcc.target/loongarch/la64/spaceship.c\nnew file mode 100644\nindex 00000000000..0c2f891b58a\n--- /dev/null\n+++ b/gcc/testsuite/gcc.target/loongarch/la64/spaceship.c\n@@ -0,0 +1,79 @@\n+/* { dg-options \"-O2\" } */\n+/* { dg-final { check-function-bodies \"**\" \"\" } } */\n+\n+#define TEST(T) \\\n+ int test_##T(T a, T b) \\\n+ { return (a == b) ? 0 : (a < b) ? -1 : 1; } \\\n+ int test_u##T(unsigned T a, unsigned T b) \\\n+ { return (a == b) ? 0 : (a < b) ? -1 : 1; }\n+\n+TEST(char)\n+TEST(short)\n+TEST(int)\n+TEST(long)\n+\n+/*\n+** test_char:\n+**\tslt\t.*\n+**\tslt\t.*\n+**\tsub\\.d\t.*\n+**\tjr\t\\$r1\n+*/\n+\n+/*\n+** test_uchar:\n+**\tsltu\t.*\n+**\tsltu\t.*\n+**\tsub\\.d\t.*\n+**\tjr\t\\$r1\n+*/\n+\n+/*\n+** test_short:\n+**\tslt\t.*\n+**\tslt\t.*\n+**\tsub\\.d\t.*\n+**\tjr\t\\$r1\n+*/\n+\n+/*\n+** test_ushort:\n+**\tsltu\t.*\n+**\tsltu\t.*\n+**\tsub\\.d\t.*\n+**\tjr\t\\$r1\n+*/\n+\n+/*\n+** test_int:\n+**\tslt\t.*\n+**\tslt\t.*\n+**\tsub\\.d\t.*\n+**\tjr\t\\$r1\n+*/\n+\n+/*\n+** test_uint:\n+**\tbstrpick\\.d\t.*,31,0\n+**\tbstrpick\\.d\t.*,31,0\n+**\tsltu\t.*\n+**\tsltu\t.*\n+**\tsub\\.d\t.*\n+**\tjr\t\\$r1\n+*/\n+\n+/*\n+** test_long:\n+**\tslt\t.*\n+**\tslt\t.*\n+**\tsub\\.d\t.*\n+**\tjr\t\\$r1\n+*/\n+\n+/*\n+** test_ulong:\n+**\tsltu\t.*\n+**\tsltu\t.*\n+**\tsub\\.d\t.*\n+**\tjr\t\\$r1\n+*/\n","prefixes":[]}