r259399, which added PROCESSOR_SKYLAKE, disabled many x86 optimizations which are enabled by PROCESSOR_HASWELL. As the result, -mtune=skylake generates slower codes on Skylake than before. The same also applies to Cannonlake and Icelak tuning. This patch changes -mtune={skylake|cannonlake|icelake} to tune like -mtune=haswell for until their tuning is properly adjusted. It also enables -mprefer-vector-width=256 for -mtune=haswell, which has no impact on codegen when AVX512 isn't enabled. Performance impacts on SPEC CPU 2017 rate with 1 copy using -march=native -mfpmath=sse -O2 -m64 are 1. On Broadwell server: 500.perlbench_r -0.56% 502.gcc_r -0.18% 505.mcf_r 0.24% 520.omnetpp_r 0.00% 523.xalancbmk_r -0.32% 525.x264_r -0.17% 531.deepsjeng_r 0.00% 541.leela_r 0.00% 548.exchange2_r 0.12% 557.xz_r 0.00% Geomean 0.00% 503.bwaves_r 0.00% 507.cactuBSSN_r 0.21% 508.namd_r 0.00% 510.parest_r 0.19% 511.povray_r -0.48% 519.lbm_r 0.00% 521.wrf_r 0.28% 526.blender_r 0.19% 527.cam4_r 0.39% 538.imagick_r 0.00% 544.nab_r -0.36% 549.fotonik3d_r 0.51% 554.roms_r 0.00% Geomean 0.17% On Skylake client: 500.perlbench_r 0.96% 502.gcc_r 0.13% 505.mcf_r -1.03% 520.omnetpp_r -1.11% 523.xalancbmk_r 1.02% 525.x264_r 0.50% 531.deepsjeng_r 2.97% 541.leela_r 0.50% 548.exchange2_r -0.95% 557.xz_r 2.41% Geomean 0.56% 503.bwaves_r 0.49% 507.cactuBSSN_r 3.17% 508.namd_r 4.05% 510.parest_r 0.15% 511.povray_r 0.80% 519.lbm_r 3.15% 521.wrf_r 10.56% 526.blender_r 2.97% 527.cam4_r 2.36% 538.imagick_r 46.40% 544.nab_r 2.04% 549.fotonik3d_r 0.00% 554.roms_r 1.27% Geomean 5.49% On Skylake server: 500.perlbench_r 0.71% 502.gcc_r -0.51% 505.mcf_r -1.06% 520.omnetpp_r -0.33% 523.xalancbmk_r -0.22% 525.x264_r 1.72% 531.deepsjeng_r -0.26% 541.leela_r 0.57% 548.exchange2_r -0.75% 557.xz_r -1.28% Geomean -0.21% 503.bwaves_r 0.00% 507.cactuBSSN_r 2.66% 508.namd_r 3.67% 510.parest_r 1.25% 511.povray_r 2.26% 519.lbm_r 1.69% 521.wrf_r 11.03% 526.blender_r 3.39% 527.cam4_r 1.69% 538.imagick_r 64.59% 544.nab_r -0.54% 549.fotonik3d_r 2.68% 554.roms_r 0.00% Geomean 6.19% This patch improves -march=native performance on Skylake up to 60% and leaves -march=native performance unchanged on Haswell. gcc/ 2018-07-13 H.J. Lu <hongjiu.lu@intel.com> Sunil K Pandey <sunil.k.pandey@intel.com> PR target/84413 * config/i386/i386.c (m_CORE_AVX512): New. (m_CORE_AVX2): Likewise. (m_CORE_ALL): Add m_CORE_AVX2. * config/i386/x86-tune.def: Replace m_HASWELL with m_CORE_AVX2. Replace m_SKYLAKE_AVX512 with m_CORE_AVX512 on avx256_optimal and remove the rest of m_SKYLAKE_AVX512. gcc/testsuite/ 2018-07-13 H.J. Lu <hongjiu.lu@intel.com> Sunil K Pandey <sunil.k.pandey@intel.com> PR target/84413 * gcc.target/i386/pr84413-1.c: New test. * gcc.target/i386/pr84413-2.c: Likewise. * gcc.target/i386/pr84413-3.c: Likewise. Co-Authored-By: Sunil K Pandey <sunil.k.pandey@intel.com> From-SVN: r262649
