From 4810dbfbd115be3180bc36984093e5627804e9f1 Mon Sep 17 00:00:00 2001 From: hjl Date: Fri, 13 Jul 2018 20:36:01 +0000 Subject: [PATCH] x86: Tune Skylake, Cannonlake and Icelake as Haswell 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/ Backport from mainline 2018-07-13 H.J. Lu Sunil K Pandey 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/ Backport from mainline 2018-07-13 H.J. Lu Sunil K Pandey 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. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-8-branch@262650 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ChangeLog | 14 ++++++++++++++ gcc/config/i386/i386.c | 5 ++++- gcc/config/i386/x86-tune.def | 26 +++++++++++++------------- gcc/testsuite/ChangeLog | 11 +++++++++++ gcc/testsuite/gcc.target/i386/pr84413-1.c | 17 +++++++++++++++++ gcc/testsuite/gcc.target/i386/pr84413-2.c | 17 +++++++++++++++++ gcc/testsuite/gcc.target/i386/pr84413-3.c | 17 +++++++++++++++++ 7 files changed, 93 insertions(+), 14 deletions(-) create mode 100644 gcc/testsuite/gcc.target/i386/pr84413-1.c create mode 100644 gcc/testsuite/gcc.target/i386/pr84413-2.c create mode 100644 gcc/testsuite/gcc.target/i386/pr84413-3.c diff --git a/gcc/ChangeLog b/gcc/ChangeLog index de0cde3eeb7..fe31b064090 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,17 @@ +2018-07-13 H.J. Lu + + Backport from mainline + 2018-07-13 H.J. Lu + Sunil K Pandey + + 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. + 2018-07-13 Marek Polacek Backport from trunk diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index d7dad81786a..8a032371e7f 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -139,7 +139,6 @@ const struct processor_costs *ix86_cost = NULL; #define m_NEHALEM (HOST_WIDE_INT_1U< + + Backport from mainline + 2018-07-13 H.J. Lu + Sunil K Pandey + + 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. + 2018-07-13 Nathan Sidwell PR c++/86374 diff --git a/gcc/testsuite/gcc.target/i386/pr84413-1.c b/gcc/testsuite/gcc.target/i386/pr84413-1.c new file mode 100644 index 00000000000..1c94d7715cf --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr84413-1.c @@ -0,0 +1,17 @@ +/* { dg-do compile } */ +/* { dg-options "-O3 -march=skylake-avx512" } */ +/* { dg-final { scan-assembler-not "%zmm\[0-9\]+" } } */ +/* { dg-final { scan-assembler "vmulpd\[ \\t\]+\[^\n\]*%ymm\[0-9\]+" } } */ + +#define N 1024 + +double a[N], b[N], c[N]; + +void +avx512f_test (void) +{ + int i; + + for (i = 0; i < N; i++) + c[i] = a[i] * b[i]; +} diff --git a/gcc/testsuite/gcc.target/i386/pr84413-2.c b/gcc/testsuite/gcc.target/i386/pr84413-2.c new file mode 100644 index 00000000000..adf9b527cd6 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr84413-2.c @@ -0,0 +1,17 @@ +/* { dg-do compile } */ +/* { dg-options "-O3 -march=cannonlake" } */ +/* { dg-final { scan-assembler-not "%zmm\[0-9\]+" } } */ +/* { dg-final { scan-assembler "vmulpd\[ \\t\]+\[^\n\]*%ymm\[0-9\]+" } } */ + +#define N 1024 + +double a[N], b[N], c[N]; + +void +avx512f_test (void) +{ + int i; + + for (i = 0; i < N; i++) + c[i] = a[i] * b[i]; +} diff --git a/gcc/testsuite/gcc.target/i386/pr84413-3.c b/gcc/testsuite/gcc.target/i386/pr84413-3.c new file mode 100644 index 00000000000..76bf25fc56b --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr84413-3.c @@ -0,0 +1,17 @@ +/* { dg-do compile } */ +/* { dg-options "-O3 -march=icelake-server" } */ +/* { dg-final { scan-assembler-not "%zmm\[0-9\]+" } } */ +/* { dg-final { scan-assembler "vmulpd\[ \\t\]+\[^\n\]*%ymm\[0-9\]+" } } */ + +#define N 1024 + +double a[N], b[N], c[N]; + +void +avx512f_test (void) +{ + int i; + + for (i = 0; i < N; i++) + c[i] = a[i] * b[i]; +} -- 2.11.4.GIT