https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56244
wbrana <wbrana at gmail dot com> changed:
What |Removed |Added
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CC| |wbrana at gmail dot com
--- Comment #4 from wbrana <wbrana at gmail dot com> ---
It should be enabled with sane default parameters like --param
max-unrolled-insns=32, which can cause up to 75% speedup in nbench benchmark
with 4.8.3
-fno-builtin-memcmp -O2 -g0 -march=native -mtune=native -fomit-frame-pointer
NUMERIC SORT : 1530.8 : 39.26 : 12.89
STRING SORT : 734.73 : 328.30 : 50.81
BITFIELD : 5.4495e+08 : 93.48 : 19.53
FP EMULATION : 304.53 : 146.13 : 33.72
FOURIER : 39030 : 44.39 : 24.93
ASSIGNMENT : 52.865 : 201.16 : 52.18
IDEA : 6828.3 : 104.44 : 31.01
HUFFMAN : 4641.2 : 128.70 : 41.10
NEURAL NET : 72.618 : 116.66 : 49.07
LU DECOMPOSITION : 2360 : 122.26 : 88.28
-fno-builtin-memcmp -O2 -g0 -march=native -mtune=native -fomit-frame-pointer
-funroll-loops --param max-unrolled-insns=32
NUMERIC SORT : 1485.9 : 38.11 : 12.52
STRING SORT : 767.45 : 342.92 : 53.08
BITFIELD : 4.9745e+08 : 85.33 : 17.82
FP EMULATION : 532.92 : 255.72 : 59.01
FOURIER : 38853 : 44.19 : 24.82
ASSIGNMENT : 57.971 : 220.59 : 57.22
IDEA : 6866.9 : 105.03 : 31.18
HUFFMAN : 4648 : 128.89 : 41.16
NEURAL NET : 87.502 : 140.56 : 59.13
LU DECOMPOSITION : 3348.2 : 173.45 : 125.25
