This patch series adds support for Function Multi-Versioning (FMV) to RISC-V. The FMV feature allows users to specify multiple versions of a function and select the version at runtime based on the target_clones and target_version attributes, which follow the RISC-V C-API Docs [1] and the existing proposal about priority syntax [2].
To test this series with the GLIBC dynamic loader, you should apply patch [3] for GLIBC to ensure the dynamic loader will initialize the gp register correctly. Changes since v4: - Update document for TARGET_CLONES_ATTR_SEPARATOR v4: https://patchwork.sourceware.org/project/gcc/list/?series=40198&state=* Changes since v3: - Remove committed patches - Remove skip splitter ';' in riscv_process_one_target_attr - Rename feature_bits.h to riscv_feature_bits.h - Split "target" and "target_version" parser [4] - Keep free arch string in riscv_target_attr_parser::update_settings [5] - Remove reapply target_version in riscv_process_target_attr [6] - Fix LTO error as patch [7] - Use std::vector and std::sort in dispatch_function_versions v3: https://patchwork.sourceware.org/project/gcc/list/?series=39863&state=* Changes since v2: - Add missing replacement for TARGET_CLONES_ATTR_SEPARATOR - Move RISC-V Extension Bitmask Definitions to riscv-ext-bitmask.def v2: https://patchwork.sourceware.org/project/gcc/list/?series=39772&state=* Changes since v1: - Add RISC-V FMV test cases - Split patches for better review - Fix commet typo in dispatch_function_versions - Severial improvements in function riscv_process_target_version_attr - Initialize m_priority in riscv_target_attr_parser constructor - Use unsigned to reference feature bits array in compare_fmv_features - Never check "default" target in riscv_process_target_attr since we have already checked it in riscv_process_target_version_attr v1: https://patchwork.sourceware.org/project/gcc/patch/tencent_3b2442361b6df87e046fb4e71d55715d6...@qq.com/ [1] https://github.com/riscv-non-isa/riscv-c-api-doc/blob/c6c5d6d9cf96b342293315a5dff3d25e96ef8191/src/c-api.adoc#__attribute__targetattr-string [2] https://github.com/riscv-non-isa/riscv-c-api-doc/pull/85 [3] https://patchwork.sourceware.org/project/glibc/patch/tencent_71d182fbda6e8e57b80731dd218d8d5c7...@qq.com/ [4] https://inbox.sourceware.org/gcc-patches/CA+yXCZBG9gKnAQ1xuxw=_j5Ry3cRNDuSNp58Tgpt=pzm4dg...@mail.gmail.com/ [5] https://inbox.sourceware.org/gcc-patches/tencent_fd68a30bdf936092b6a663146e634c76c...@qq.com/ [6] https://inbox.sourceware.org/gcc-patches/tencent_a646c713dc9218dd10ca460ebe074153e...@qq.com/ [7] https://patchwork.sourceware.org/project/gcc/patch/tencent_f08be088f6b1e3152e508c63c870e31cd...@qq.com/ Yangyu Chen (8): Introduce TARGET_CLONES_ATTR_SEPARATOR for RISC-V RISC-V: Implement Priority syntax parser for Function Multi-Versioning RISC-V: Implement riscv_minimal_hwprobe_feature_bits RISC-V: Implement TARGET_OPTION_VALID_VERSION_ATTRIBUTE_P RISC-V: Implement TARGET_COMPARE_VERSION_PRIORITY and TARGET_OPTION_FUNCTION_VERSIONS RISC-V: Implement TARGET_MANGLE_DECL_ASSEMBLER_NAME RISC-V: Implement TARGET_GENERATE_VERSION_DISPATCHER_BODY and TARGET_GET_FUNCTION_VERSIONS_DISPATCHER RISC-V: Add Multi-Versioning Test Cases gcc/attribs.cc | 17 +- gcc/common/config/riscv/riscv-common.cc | 94 +++ gcc/common/config/riscv/riscv-ext-bitmask.def | 83 ++ gcc/config/riscv/riscv-feature-bits.h | 44 + gcc/config/riscv/riscv-protos.h | 4 +- gcc/config/riscv/riscv-subset.h | 5 + gcc/config/riscv/riscv-target-attr.cc | 142 +++- gcc/config/riscv/riscv.cc | 757 ++++++++++++++++++ gcc/config/riscv/riscv.h | 7 + gcc/config/riscv/riscv.opt | 3 + gcc/defaults.h | 4 + gcc/doc/tm.texi | 7 + gcc/doc/tm.texi.in | 7 + gcc/multiple_target.cc | 19 +- gcc/testsuite/g++.target/riscv/mv-symbols1.C | 70 ++ gcc/testsuite/g++.target/riscv/mv-symbols2.C | 61 ++ gcc/testsuite/g++.target/riscv/mv-symbols3.C | 50 ++ gcc/testsuite/g++.target/riscv/mv-symbols4.C | 56 ++ gcc/testsuite/g++.target/riscv/mv-symbols5.C | 62 ++ gcc/testsuite/g++.target/riscv/mvc-symbols1.C | 49 ++ gcc/testsuite/g++.target/riscv/mvc-symbols2.C | 36 + gcc/testsuite/g++.target/riscv/mvc-symbols3.C | 42 + gcc/testsuite/g++.target/riscv/mvc-symbols4.C | 32 + gcc/tree.cc | 4 +- 24 files changed, 1627 insertions(+), 28 deletions(-) create mode 100644 gcc/common/config/riscv/riscv-ext-bitmask.def create mode 100644 gcc/config/riscv/riscv-feature-bits.h create mode 100644 gcc/testsuite/g++.target/riscv/mv-symbols1.C create mode 100644 gcc/testsuite/g++.target/riscv/mv-symbols2.C create mode 100644 gcc/testsuite/g++.target/riscv/mv-symbols3.C create mode 100644 gcc/testsuite/g++.target/riscv/mv-symbols4.C create mode 100644 gcc/testsuite/g++.target/riscv/mv-symbols5.C create mode 100644 gcc/testsuite/g++.target/riscv/mvc-symbols1.C create mode 100644 gcc/testsuite/g++.target/riscv/mvc-symbols2.C create mode 100644 gcc/testsuite/g++.target/riscv/mvc-symbols3.C create mode 100644 gcc/testsuite/g++.target/riscv/mvc-symbols4.C -- 2.45.2
