https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119100
--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Paul-Antoine Arras <par...@gcc.gnu.org>: https://gcc.gnu.org/g:b437418bc9547073ec2704398c85c52e060e1fab commit r16-1071-gb437418bc9547073ec2704398c85c52e060e1fab Author: Paul-Antoine Arras <par...@baylibre.com> Date: Mon May 12 14:42:24 2025 +0200 RISC-V: Add pattern for vector-scalar multiply-add/sub [PR119100] This pattern enables the combine pass (or late-combine, depending on the case) to merge a vec_duplicate into a plus-mult or minus-mult RTL instruction. Before this patch, we have two instructions, e.g.: vfmv.v.f v6,fa0 vfmadd.vv v9,v6,v7 After, we get only one: vfmadd.vf v9,fa0,v7 On SPEC2017's 503.bwaves_r, depending on the workload, the reduction in dynamic instruction count varies from -4.66% to -4.75%. PR target/119100 gcc/ChangeLog: * config/riscv/autovec-opt.md (*<optab>_vf_<mode>): Add new pattern to combine vec_duplicate + vfm{add,sub}.vv into vfm{add,sub}.vf. * config/riscv/riscv-opts.h (FPR2VR_COST_UNPROVIDED): Define. * config/riscv/riscv-protos.h (get_fr2vr_cost): Declare function. * config/riscv/riscv.cc (riscv_rtx_costs): Add cost model for MULT with VEC_DUPLICATE. (get_fr2vr_cost): New function. * config/riscv/riscv.opt: Add new option --param=fpr2vr-cost. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/autovec/vx_vf/vf-1-f16.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-1-f32.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-1-f64.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-2-f16.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-2-f32.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-2-f64.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-3-f16.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-3-f32.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-3-f64.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-4-f16.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-4-f32.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf-4-f64.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf_mulop.h: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf_mulop_data.h: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf_mulop_run.h: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf_vfmadd-run-1-f16.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf_vfmadd-run-1-f32.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf_vfmadd-run-1-f64.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf_vfmsub-run-1-f16.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf_vfmsub-run-1-f32.c: New test. * gcc.target/riscv/rvv/autovec/vx_vf/vf_vfmsub-run-1-f64.c: New test.
