https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100089
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>: https://gcc.gnu.org/g:819b7c3a339e3bdaf85cd55954c5536bd98aae09 commit r12-3103-g819b7c3a339e3bdaf85cd55954c5536bd98aae09 Author: liuhongt <hongtao....@intel.com> Date: Wed Aug 4 16:39:31 2021 +0800 Disable slp in loop vectorizer when cost model is very-cheap. Performance impact for the commit with option: -march=x86-64 -O2 -ftree-vectorize -fvect-cost-model=very-cheap SPEC2017 fprate 503.bwaves_r BuildSame 507.cactuBSSN_r -0.04 508.namd_r 0.14 510.parest_r -0.54 511.povray_r 0.10 519.lbm_r BuildSame 521.wrf_r 0.64 526.blender_r -0.32 527.cam4_r 0.17 538.imagick_r 0.09 544.nab_r BuildSame 549.fotonik3d_r BuildSame 554.roms_r BuildSame 997.specrand_fr -0.09 Geometric mean: 0.02 SPEC2017 intrate 500.perlbench_r 0.26 502.gcc_r 0.21 505.mcf_r -0.09 520.omnetpp_r BuildSame 523.xalancbmk_r BuildSame 525.x264_r -0.41 531.deepsjeng_r BuildSame 541.leela_r 0.13 548.exchange2_r BuildSame 557.xz_r BuildSame 999.specrand_ir BuildSame Geometric mean: 0.02 EEMBC: no regression, only improvement or build the same, the below is improved benchmarks. mp2decoddata1 7.59 mp2decoddata2 31.80 mp2decoddata3 12.15 mp2decoddata4 11.16 mp2decoddata5 11.19 mp2decoddata1 7.06 mp2decoddata2 24.12 mp2decoddata3 10.83 mp2decoddata4 10.04 mp2decoddata5 10.07 gcc/ChangeLog: PR tree-optimization/100089 * tree-vectorizer.c (try_vectorize_loop_1): Disable slp in loop vectorizer when cost model is very-cheap.
