diff options
| author | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2018-05-31 15:02:36 +0000 |
|---|---|---|
| committer | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2018-05-31 15:02:36 +0000 |
| commit | a48d7dbe942c1f56dcce07730a0e0a44681e3256 (patch) | |
| tree | 83ffd5e74b640b0388075037564eb75fd7242a48 /libgcc | |
| parent | 14c9d075813974791bf49a0d4196782d68955509 (diff) | |
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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-8-branch@261026 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libgcc')
0 files changed, 0 insertions, 0 deletions