https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113495
--- Comment #24 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Robin Dapp <rd...@gcc.gnu.org>: https://gcc.gnu.org/g:01260a823073675e13dd1fc85cf2657a5396adf2 commit r14-8282-g01260a823073675e13dd1fc85cf2657a5396adf2 Author: Juzhe-Zhong <juzhe.zh...@rivai.ai> Date: Fri Jan 19 16:34:25 2024 +0800 RISC-V: Fix RVV_VLMAX This patch fixes memory hog found in SPEC2017 wrf benchmark which caused by RVV_VLMAX since RVV_VLMAX generate brand new rtx by gen_rtx_REG (Pmode, X0_REGNUM) every time we call RVV_VLMAX, that is, we are always generating garbage and redundant (reg:DI 0 zero) rtx. After this patch fix, the memory hog is gone. Time variable usr sys wall GGC machine dep reorg : 1.99 ( 9%) 0.35 ( 56%) 2.33 ( 10%) 939M ( 80%) [Before this patch] machine dep reorg : 1.71 ( 6%) 0.16 ( 27%) 3.77 ( 6%) 659k ( 0%) [After this patch] Time variable usr sys wall GGC machine dep reorg : 75.93 ( 18%) 14.23 ( 88%) 90.15 ( 21%) 33383M ( 95%) [Before this patch] machine dep reorg : 56.00 ( 14%) 7.92 ( 77%) 63.93 ( 15%) 4361k ( 0%) [After this patch] Test is running. Ok for trunk if I passed the test with no regresion ? PR target/113495 gcc/ChangeLog: * config/riscv/riscv-protos.h (RVV_VLMAX): Change to regno_reg_rtx[X0_REGNUM]. (RVV_VUNDEF): Ditto. * config/riscv/riscv-vsetvl.cc: Add timevar.
