[patch] Excessive alignment in ix86_data_alignment

[Kirill Yukhin]

On 08 Oct 23:02, Petr Murzin wrote:
> Hi,
> I have measured performance impact on Haswell platform according to this
> input:
> https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00978.html
Same in plain text:
For `-O2':
Test		Previous Current Ratio(%)
400.perlbench	46.2000	46.2000	+0%
401.bzip2       29.0000	29.0000	+0%
403.gcc	        41.0000	41.2000	+0.48%
429.mcf	        53.7000	53.3000	-0.74%
445.gobmk       32.3000	32.3000	+0%
456.hmmer       32.3000	32.3000	+0%
458.sjeng       36.1000	36.4000	+0.83%
462.libquantum	84.5000	84.3000	-0.23%
464.h264ref	64.4000	64.4000	+0%
471.omnetpp	27.7000	27.9000	+0.72%
473.astar	28.1000	28.0000	-0.35%
483.xalancbmk	49.9000	50.2000	+0.60%
410.bwaves	93.2000	93.4000	+0.21%
416.gamess	41.9000	41.8000	-0.23%
433.milc	37.9000	37.8000	-0.26%
434.zeusmp	48.5000	48.4000	-0.20%
435.gromacs	32.5000	32.6000	+0.30%
436.cactusADM	82.8000	80.9000	-2.29%
437.leslie3d	55.6000	55.7000	+0.17%
444.namd	32.1000	32.1000	+0%
447.dealII	67.5000	67.5000	+0%
450.soplex	48.0000	47.9000	-0.20%
453.povray	58.3000	58.4000	+0.17%
454.calculix	37.6000	37.6000	+0%
459.GemsFDTD	44.5000	44.7000	+0.44%
465.tonto	28.6000	28.6000	+0%
470.lbm		67.9000	67.8000	-0.14%
481.wrf		49.4000	49.5000	+0.20%
482.sphinx3	68.7000	68.6000	-0.14%
Geomeans:
INT     	41.14	41.18	+0.11%
FP      	49.82	49.76	-0.12%
ALL     	46.03	46.01	-0.02%

For `-O3':
Test		Previous Current Ratio(%)
400.perlbench	46.2000	46.2000	+0%
401.bzip2	29.0000	29.1000	+0.34%
403.gcc		41.1000	41.2000	+0.24%
429.mcf		53.4000	54.6000	+2.24%
445.gobmk	32.3000	32.3000	+0%
456.hmmer	32.3000	32.3000	+0%
458.sjeng	36.1000	36.4000	+0.83%
462.libquantum	84.0000	84.8000	+0.95%
464.h264ref	64.2000	64.3000	+0.15%
471.omnetpp	27.6000	27.8000	+0.72%
473.astar	28.0000	28.0000	+0%
483.xalancbmk	50.1000	49.8000	-0.59%
410.bwaves	93.5000	93.6000	+0.10%
416.gamess	41.8000	41.9000	+0.23%
433.milc	37.8000	37.8000	+0%
434.zeusmp	48.5000	48.4000	-0.20%
435.gromacs	32.6000	32.4000	-0.61%
436.cactusADM	80.4000	81.2000	+0.99%
437.leslie3d	55.7000	55.7000	+0%
444.namd	32.1000	32.1000	+0%
447.dealII	67.6000	67.6000	+0%
450.soplex	48.6000	48.2000	-0.82%
453.povray	58.3000	58.5000	+0.34%
454.calculix	37.6000	37.6000	+0%
459.GemsFDTD	44.7000	44.6000	-0.22%
465.tonto	28.6000	28.6000	+0%
470.lbm		68.1000	68.1000	+0%
481.wrf		49.5000	49.6000	+0.20%
482.sphinx3	68.5000	68.0000	-0.72%
Geomeans:
INT     	41.08	41.25	+0.41%
FP      	49.80	49.78	-0.04%
ALL     	45.99	46.06	+0.14%

--
Thanks, K