https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120476
--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-15 branch has been updated by LuluCheng <chengl...@gcc.gnu.org>: https://gcc.gnu.org/g:c4e96a094636b3c15b5e3bfde8673ec3b8172993 commit r15-10223-gc4e96a094636b3c15b5e3bfde8673ec3b8172993 Author: Lulu Cheng <chengl...@loongson.cn> Date: Wed Aug 13 11:04:35 2025 +0800 LoongArch: Define hook TARGET_COMPUTE_PRESSURE_CLASSES[PR120476]. The rtx cost value defined by the target backend affects the calculation of register pressure classes in the IRA, thus affecting scheduling. This may cause program performance degradation. For example, OpenSSL 3.5.1 SHA512 and SPEC CPU 2017 exchange_r. This problem can be avoided by defining a set of register pressure classes in the target backend instead of using the default IRA to automatically calculate them. gcc/ChangeLog: PR target/120476 * config/loongarch/loongarch.cc (loongarch_compute_pressure_classes): New function. (TARGET_COMPUTE_PRESSURE_CLASSES): Define. (cherry picked from commit d94178d9b3fb1cb869b90d6f061990eae75c770e)
