RISC-V Code Size Reduction(ZC*) extensions is a group of extensions which define subsets of the existing C extension (Zca, Zcd, Zcf) and new extensions(Zcb, Zcmp, Zcmt) which only contain 16-bit encodings.[1]
The implementation of the RISC-V Code Size Reduction extension in GCC is an important step towards making the RISC-V architecture more efficient. The cooperation with OpenHW group has played a crucial role in this effort, with facilitating the implementation, testing and validation. Currently works can also find in OpenHW group's github repo.[2] Thanks to Tariq Kurd, Ibrahim Abu Kharmeh for help with explain the specification, and Jeremy Bennett's patient guidance throughout the whole development process.a V2 changes: Fix Kito's comments in first version, Eswin assisted in optimizing the implementation of Zcmp extension: https://gcc.gnu.org/pipermail/gcc-patches/2023-May/617440.html https://gcc.gnu.org/pipermail/gcc-patches/2023-May/617442.html https://gcc.gnu.org/pipermail/gcc-patches/2023-June/620869.html [1] github.com/riscv/riscv-code-size-reduction/tree/main/Zc-specification [2] github.com/openhwgroup/corev-gcc Co-Authored by: Charlie Keaney <charlie.kea...@embecosm.com> Co-Authored by: Mary Bennett <mary.benn...@embecosm.com> Co-Authored by: Nandni Jamnadas <nandni.jamna...@embecosm.com> Co-Authored by: Sinan Lin <sinan....@linux.alibaba.com> Co-Authored by: Simon Cook <simon.c...@embecosm.com> Co-Authored by: Shihua Liao <shi...@iscas.ac.cn> Co-Authored by: Yulong Shi <yul...@iscas.ac.cn> RISC-V: Minimal support for ZC extensions. RISC-V: Enable compressible features when use ZC* extensions. RISC-V: Add ZC* test for march args being passed. Jiawei (3): RISC-V: Minimal support for ZC* extensions. RISC-V: Enable compressible features when use ZC* extensions. RISC-V: Add ZC* test for failed march args being passed. gcc/common/config/riscv/riscv-common.cc | 38 +++++++++++++++++++++++ gcc/config/riscv/riscv-c.cc | 2 +- gcc/config/riscv/riscv-opts.h | 16 ++++++++++ gcc/config/riscv/riscv-shorten-memrefs.cc | 3 +- gcc/config/riscv/riscv.cc | 11 ++++--- gcc/config/riscv/riscv.h | 2 +- gcc/config/riscv/riscv.opt | 3 ++ gcc/testsuite/gcc.target/riscv/arch-22.c | 5 +++ gcc/testsuite/gcc.target/riscv/arch-23.c | 5 +++ 9 files changed, 78 insertions(+), 7 deletions(-) create mode 100644 gcc/testsuite/gcc.target/riscv/arch-22.c create mode 100644 gcc/testsuite/gcc.target/riscv/arch-23.c -- 2.25.1
