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GET /api/1.1/patches/2219730/?format=api
{ "id": 2219730, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2219730/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260404022637.3094-1-gerris.rs@gmail.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.1/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 }, "msgid": "<20260404022637.3094-1-gerris.rs@gmail.com>", "date": "2026-04-04T02:26:36", "name": "[gccrs,COMMIT,1/2] intrinsic: Add cttz and cttz_nonzero intrinsics", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "34ffba5da9228511ac652af49e27ea558d908344", "submitter": { "id": 92092, "url": "http://patchwork.ozlabs.org/api/1.1/people/92092/?format=api", "name": null, "email": "gerris.rs@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260404022637.3094-1-gerris.rs@gmail.com/mbox/", "series": [ { "id": 498695, "url": "http://patchwork.ozlabs.org/api/1.1/series/498695/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=498695", "date": "2026-04-04T02:26:36", "name": "[gccrs,COMMIT,1/2] intrinsic: Add cttz and cttz_nonzero intrinsics", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498695/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2219730/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219730/checks/", "tags": {}, "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) 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w6EeUq8/WW0a9LS7HU653cAFB4EU0v5+Iim78E5KKR/9wutHOyDBTQDBykPUedKOQXw0Obth+K1\n x9KEDjLw+9HKgt3YFUgBMMW70VMRIA/+lgNpearBZmwKDFP0YvtQXwbi3G4ulT9YuQfAZUPC8/U\n rj2gGM+VHGYwApGFcypMw==", "X-Received": "by 2002:a05:620a:40d5:b0:8ca:2e36:18b0 with SMTP id\n af79cd13be357-8d41da56befmr851572385a.39.1775269600918;\n Fri, 03 Apr 2026 19:26:40 -0700 (PDT)", "From": "gerris.rs@gmail.com", "To": "gcc-patches@gcc.gnu.org,\n\tgcc-rust@gcc.gnu.org", "Cc": "pierre-emmanuel.patry@embecosm.com, arthur.cohen@embecosm.com,\n dkm+gccrs@kataplop.net, Mohamed Ali <mohmedali1462005@gmail.com>", "Subject": "[gccrs COMMIT 1/2] intrinsic: Add cttz and cttz_nonzero intrinsics", "Date": "Sat, 4 Apr 2026 02:26:36 +0000", "Message-ID": "<20260404022637.3094-1-gerris.rs@gmail.com>", "X-Mailer": "git-send-email 2.43.0", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "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 <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": "From: Mohamed Ali <mohmedali1462005@gmail.com>\n\nThis commit introduces the cttz and cttz_nonzero intrinsics for counting leading zeros\nin integer types.\n\nThe implementation includes handlers for both intrinsics, which validate input types and utilize\n\nAddresses: Rust-GCC#658\n\ngcc/rust/ChangeLog:\n\n\t* backend/rust-compile-intrinsic.cc: Register cttz and cttz_nonzero intrinsics.\n\t* backend/rust-intrinsic-handlers.cc (cttz_handler): Implemnt cttz_handler.\n\t(cttz_nonzero_handler): Implemnt cttz_nonzero_handler.\n\t* backend/rust-intrinsic-handlers.h (cttz_handler): Add decl for cttz_handler.\n\t(cttz_nonzero_handler): Add decl for cttz_handler.\n\t* util/rust-intrinsic-values.h: map cttz_nonzero to its name.\n\nSigned-off-by: Mohamed Ali <mohmedali1462005@gmail.com>\n---\nThis change was merged into the gccrs repository and is posted here for\nupstream visibility and potential drive-by review, as requested by GCC\nrelease managers.\nEach commit email contains a link to its details on github from where you can\nfind the Pull-Request and associated discussions.\n\n\nCommit on github: https://github.com/Rust-GCC/gccrs/commit/2e6205babb0fcd025490cbb94b022f33f5a3035e\n\nThe commit has been mentioned in the following pull-request(s):\n - https://github.com/Rust-GCC/gccrs/pull/4511\n\n gcc/rust/backend/rust-compile-intrinsic.cc | 4 +-\n gcc/rust/backend/rust-intrinsic-handlers.cc | 142 ++++++++++++++++++++\n gcc/rust/backend/rust-intrinsic-handlers.h | 2 +\n gcc/rust/util/rust-intrinsic-values.h | 1 +\n 4 files changed, 148 insertions(+), 1 deletion(-)\n\n\nbase-commit: 6211b044aa5192c737ced7e2aa1fad2ff1423293", "diff": "diff --git a/gcc/rust/backend/rust-compile-intrinsic.cc b/gcc/rust/backend/rust-compile-intrinsic.cc\nindex 9263883e9..1456f88df 100644\n--- a/gcc/rust/backend/rust-compile-intrinsic.cc\n+++ b/gcc/rust/backend/rust-compile-intrinsic.cc\n@@ -70,7 +70,9 @@ static const std::map<std::string, handlers::HandlerBuilder> generic_intrinsics\n {IValue::VARIANT_COUNT, handlers::variant_count},\n {IValue::BSWAP, handlers::bswap_handler},\n {IValue::CTLZ, handlers::ctlz_handler},\n- {IValue::CTLZ_NONZERO, handlers::ctlz_nonzero_handler}};\n+ {IValue::CTLZ_NONZERO, handlers::ctlz_nonzero_handler},\n+ {IValue::CTTZ, handlers::cttz_handler},\n+ {IValue::CTTZ_NONZERO, handlers::cttz_nonzero_handler}};\n \n Intrinsics::Intrinsics (Context *ctx) : ctx (ctx) {}\n \ndiff --git a/gcc/rust/backend/rust-intrinsic-handlers.cc b/gcc/rust/backend/rust-intrinsic-handlers.cc\nindex eb86c8ad9..8cbcb9ca4 100644\n--- a/gcc/rust/backend/rust-intrinsic-handlers.cc\n+++ b/gcc/rust/backend/rust-intrinsic-handlers.cc\n@@ -893,6 +893,136 @@ ctlz_handler (Context *ctx, TyTy::FnType *fntype, bool nonzero)\n return fndecl;\n }\n \n+// Shared inner implementation for cttz and cttz_nonzero.\n+//\n+// nonzero=false → cttz: cttz(0) is well-defined in Rust and must return\n+// bit_size, but __builtin_ctz*(0) is undefined behaviour in C, so an\n+// explicit arg==0 guard is emitted.\n+//\n+// nonzero=true → cttz_nonzero: the caller guarantees arg != 0 (passing 0\n+// is immediate UB in Rust), so the zero guard is omitted entirely.\n+static tree\n+cttz_handler (Context *ctx, TyTy::FnType *fntype, bool nonzero)\n+{\n+ rust_assert (fntype->get_params ().size () == 1);\n+\n+ tree lookup = NULL_TREE;\n+ if (check_for_cached_intrinsic (ctx, fntype, &lookup))\n+ return lookup;\n+\n+ auto fndecl = compile_intrinsic_function (ctx, fntype);\n+\n+ std::vector<Bvariable *> param_vars;\n+ compile_fn_params (ctx, fntype, fndecl, ¶m_vars);\n+\n+ auto arg_param = param_vars.at (0);\n+ if (!Backend::function_set_parameters (fndecl, param_vars))\n+ return error_mark_node;\n+\n+ rust_assert (fntype->get_num_substitutions () == 1);\n+ auto *monomorphized_type\n+ = fntype->get_substs ().at (0).get_param_ty ()->resolve ();\n+ if (!check_for_basic_integer_type (\"cttz\", fntype->get_locus (),\n+\t\t\t\t monomorphized_type))\n+ return error_mark_node;\n+\n+ enter_intrinsic_block (ctx, fndecl);\n+\n+ // BUILTIN cttz FN BODY BEGIN\n+ auto locus = fntype->get_locus ();\n+ auto arg_expr = Backend::var_expression (arg_param, locus);\n+ tree arg_type = TREE_TYPE (arg_expr);\n+ unsigned bit_size = TYPE_PRECISION (arg_type);\n+\n+ // Convert signed types to their same-width unsigned equivalent before\n+ // widening. For cttz this is not strictly required for correctness (sign\n+ // extension fills high bits with 1s, which does not alter the trailing-zero\n+ // count at the low end), but it avoids relying on signed-integer\n+ // representations and keeps the approach consistent with ctlz.\n+ tree unsigned_type\n+ = !TYPE_UNSIGNED (arg_type) ? unsigned_type_for (arg_type) : arg_type;\n+ tree unsigned_arg = fold_convert (unsigned_type, arg_expr);\n+\n+ // Pick the narrowest GCC ctz builtin whose operand type is wide enough to\n+ // hold bit_size bits. Unlike ctlz, no diff adjustment is needed: widening\n+ // a value zero-extends it (fills the added high bits with 0s), which does\n+ // not introduce new trailing zeros at the low end.\n+ //\n+ // Example: cttz(0b00001000_u8) = 3\n+ // Widened to u32: 0x00000008. __builtin_ctz(0x00000008) = 3.\n+ //\n+ // TODO: 128-bit integers are not yet handled.\n+ unsigned int_prec = TYPE_PRECISION (unsigned_type_node);\n+ unsigned long_prec = TYPE_PRECISION (long_unsigned_type_node);\n+ unsigned longlong_prec = TYPE_PRECISION (long_long_unsigned_type_node);\n+\n+ const char *builtin_name = nullptr;\n+ tree cast_type = NULL_TREE;\n+\n+ if (bit_size <= int_prec)\n+ {\n+ // Fits in unsigned int: covers 8/16/32-bit integers on most targets.\n+ builtin_name = \"__builtin_ctz\";\n+ cast_type = unsigned_type_node;\n+ }\n+ else if (bit_size <= long_prec)\n+ {\n+ // Fits in unsigned long but not unsigned int.\n+ builtin_name = \"__builtin_ctzl\";\n+ cast_type = long_unsigned_type_node;\n+ }\n+ else if (bit_size <= longlong_prec)\n+ {\n+ // Fits in unsigned long long but not unsigned long.\n+ builtin_name = \"__builtin_ctzll\";\n+ cast_type = long_long_unsigned_type_node;\n+ }\n+ else\n+ {\n+ rust_sorry_at (locus, \"cttz for %u-bit integers is not yet implemented\",\n+\t\t bit_size);\n+ return error_mark_node;\n+ }\n+\n+ tree call_arg = fold_convert (cast_type, unsigned_arg);\n+\n+ tree builtin_decl = error_mark_node;\n+ BuiltinsContext::get ().lookup_simple_builtin (builtin_name, &builtin_decl);\n+ rust_assert (builtin_decl != error_mark_node);\n+\n+ tree builtin_fn = build_fold_addr_expr_loc (locus, builtin_decl);\n+ tree ctz_expr\n+ = Backend::call_expression (builtin_fn, {call_arg}, nullptr, locus);\n+\n+ ctz_expr = fold_convert (uint32_type_node, ctz_expr);\n+\n+ tree final_expr;\n+ if (!nonzero)\n+ {\n+ // cttz(0) must return bit_size per the Rust reference.\n+ // We cannot pass 0 to __builtin_ctz* (UB), so emit:\n+ // arg == 0 ? bit_size : ctz_expr\n+ tree zero = build_int_cst (arg_type, 0);\n+ tree cmp = fold_build2 (EQ_EXPR, boolean_type_node, arg_expr, zero);\n+ tree width_cst = build_int_cst (uint32_type_node, bit_size);\n+ final_expr\n+\t= fold_build3 (COND_EXPR, uint32_type_node, cmp, width_cst, ctz_expr);\n+ }\n+ else\n+ {\n+ // cttz_nonzero: arg != 0 is guaranteed by the caller, no guard needed.\n+ final_expr = ctz_expr;\n+ }\n+\n+ tree result = fold_convert (TREE_TYPE (DECL_RESULT (fndecl)), final_expr);\n+ auto return_stmt = Backend::return_statement (fndecl, result, locus);\n+ ctx->add_statement (return_stmt);\n+ // BUILTIN cttz FN BODY END\n+\n+ finalize_intrinsic_block (ctx, fndecl);\n+ return fndecl;\n+}\n+\n } // namespace inner\n \n const HandlerBuilder\n@@ -1687,6 +1817,18 @@ ctlz_nonzero_handler (Context *ctx, TyTy::FnType *fntype)\n return inner::ctlz_handler (ctx, fntype, true);\n }\n \n+tree\n+cttz_handler (Context *ctx, TyTy::FnType *fntype)\n+{\n+ return inner::cttz_handler (ctx, fntype, false);\n+}\n+\n+tree\n+cttz_nonzero_handler (Context *ctx, TyTy::FnType *fntype)\n+{\n+ return inner::cttz_handler (ctx, fntype, true);\n+}\n+\n } // namespace handlers\n } // namespace Compile\n } // namespace Rust\ndiff --git a/gcc/rust/backend/rust-intrinsic-handlers.h b/gcc/rust/backend/rust-intrinsic-handlers.h\nindex 52462407f..f4c36b3fe 100644\n--- a/gcc/rust/backend/rust-intrinsic-handlers.h\n+++ b/gcc/rust/backend/rust-intrinsic-handlers.h\n@@ -67,6 +67,8 @@ tree variant_count (Context *ctx, TyTy::FnType *fntype);\n tree bswap_handler (Context *ctx, TyTy::FnType *fntype);\n tree ctlz_handler (Context *ctx, TyTy::FnType *fntype);\n tree ctlz_nonzero_handler (Context *ctx, TyTy::FnType *fntype);\n+tree cttz_handler (Context *ctx, TyTy::FnType *fntype);\n+tree cttz_nonzero_handler (Context *ctx, TyTy::FnType *fntype);\n \n tree prefetch_data (Context *ctx, TyTy::FnType *fntype, Prefetch kind);\n \ndiff --git a/gcc/rust/util/rust-intrinsic-values.h b/gcc/rust/util/rust-intrinsic-values.h\nindex 1b2d968b9..c868c851d 100644\n--- a/gcc/rust/util/rust-intrinsic-values.h\n+++ b/gcc/rust/util/rust-intrinsic-values.h\n@@ -83,6 +83,7 @@ public:\n static constexpr auto &CTLZ = \"ctlz\";\n static constexpr auto &CTLZ_NONZERO = \"ctlz_nonzero\";\n static constexpr auto &CTTZ = \"cttz\";\n+ static constexpr auto &CTTZ_NONZERO = \"cttz_nonzero\";\n static constexpr auto &BSWAP = \"bswap\";\n static constexpr auto &BITREVERSE = \"bitreverse\";\n static constexpr auto &TYPE_ID = \"type_id\";\n", "prefixes": [ "gccrs", "COMMIT", "1/2" ] }