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| author | H.J. Lu <hongjiu.lu@intel.com> | 2018-05-31 15:37:22 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl@gcc.gnu.org> | 2018-05-31 08:37:22 -0700 |
| commit | 3217e694854fe50be13091f071283f47aad9b348 (patch) | |
| tree | 711df1b4cb3a1740a15ade8d61067cd35139f4f8 /gcc/tree-ssa-structalias.c | |
| parent | bd1cab35c5eabf51d9392751036fa3a71758d263 (diff) | |
| download | gcc-3217e694854fe50be13091f071283f47aad9b348.zip gcc-3217e694854fe50be13091f071283f47aad9b348.tar.gz gcc-3217e694854fe50be13091f071283f47aad9b348.tar.bz2 | |
x86: Re-enable partial_reg_dependency and movx for Haswell
r254152 disabled partial_reg_dependency and movx for Haswell and newer
Intel processors. r258972 restored them for skylake-avx512. For Haswell,
movx improves performance. But partial_reg_stall may be better than
partial_reg_dependency in theory. We will investigate performance impact
of partial_reg_stall vs partial_reg_dependency on Haswell for GCC 9. In
the meantime, this patch restores both partial_reg_dependency and mox for
Haswell in GCC 8.
On Haswell, improvements for EEMBC benchmarks with
-mtune-ctrl=movx,partial_reg_dependency -Ofast -march=haswell
vs
-Ofast -mtune=haswell
are
automotive
=========
aifftr01 (default) - goodperf: Runtime improvement of 2.6% (time).
aiifft01 (default) - goodperf: Runtime improvement of 2.2% (time).
networking
=========
ip_pktcheckb1m (default) - goodperf: Runtime improvement of 3.8% (time).
ip_pktcheckb2m (default) - goodperf: Runtime improvement of 5.2% (time).
ip_pktcheckb4m (default) - goodperf: Runtime improvement of 4.4% (time).
ip_pktcheckb512k (default) - goodperf: Runtime improvement of 4.2% (time).
telecom
=========
fft00data_1 (default) - goodperf: Runtime improvement of 8.4% (time).
fft00data_2 (default) - goodperf: Runtime improvement of 8.6% (time).
fft00data_3 (default) - goodperf: Runtime improvement of 9.0% (time).
PR target/85829
* config/i386/x86-tune.def: Re-enable partial_reg_dependency
and movx for Haswell.
From-SVN: r261028
Diffstat (limited to 'gcc/tree-ssa-structalias.c')
0 files changed, 0 insertions, 0 deletions