https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112936
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Xi Ruoyao <xry...@gcc.gnu.org>: https://gcc.gnu.org/g:50b3f596bd943ec6110c1987f14e5497ce39622f commit r14-6642-g50b3f596bd943ec6110c1987f14e5497ce39622f Author: Xi Ruoyao <xry...@xry111.site> Date: Sat Dec 9 17:41:32 2023 +0800 LoongArch: Fix instruction costs [PR112936] Replace the instruction costs in loongarch_rtx_cost_data constructor based on micro-benchmark results on LA464 and LA664. This allows optimizations like "x * 17" to alsl, and "x * 68" to alsl and slli. gcc/ChangeLog: PR target/112936 * config/loongarch/loongarch-def.cc (loongarch_rtx_cost_data::loongarch_rtx_cost_data): Update instruction costs per micro-benchmark results. (loongarch_rtx_cost_optimize_size): Set all instruction costs to (COSTS_N_INSNS (1) + 1). * config/loongarch/loongarch.cc (loongarch_rtx_costs): Remove special case for multiplication when optimizing for size. Adjust division cost when TARGET_64BIT && !TARGET_DIV32. Account the extra cost when TARGET_CHECK_ZERO_DIV and optimizing for speed. gcc/testsuite/ChangeLog PR target/112936 * gcc.target/loongarch/mul-const-reduction.c: New test.
