Mail Archives: pgcc/1998/03/17/16:51:47
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Yo 'Ric Dude wrote:
> Hi,
>
> I'm not on the mailing list, but would like to know if
> there is any data on performance comparisons between
> gcc/egcs and pgcc for the AMD K5/K6 series of CPUs.
>
> If not, is there a recommendation on how to acquire
> such data? Once acquired, would anyone be interested
> in adding that data to the FAQ/pgcc pages for others
> who may be curious?
>
> Any information appreciated.
>
> -- ebm
> +=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
> | __ a.k.a. Eric B. Mitchell |
> | |_) . _ _| _| _ ericmit AT ix DOT netcom DOT com |
> | | \ ( (_ (_| (_| (_| (/_ www.netcom.com/~ericmit |
> | How's My Programming? Call: 1 - 800 - DEV - NULL |
> +=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
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Subject: Re: PGCC optimizing AMD K6?
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Yes it does. Use the -mamdk6 command line option.
I've run the Byte Benchmark (nbench-byte-2.1) with gcc, egcs, and pgcc to
see what execution improvements can be expected.
All tests were executed on the same platform:
K6 200MHz, 512kb 2nd-level Cache, linux-2.1.79, glibc-2.0.5
===========================================================================
(0) (1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
===========================================================================
NUMERIC SORT 0.84 0.84 0.79 0.84 0.84 0.84 0.79 0.88 0.82 0.72 0.91
STRING SORT 0.75 0.77 0.78 0.78 0.82 0.83 0.82 0.84 0.80 0.78 0.82
BITFIELD 0.87 0.88 0.87 0.89 0.87 0.94 0.86 0.91 0.87 0.83 0.90
FP EMULATION 0.81 0.71 0.74 0.80 0.75 0.76 0.85 0.78 0.82 0.89 0.88
FOURIER 1.23 1.23 1.20 1.20 1.20 1.21 1.22 1.23 1.22 1.17 1.22
ASSIGNMENT 1.08 0.83 0.84 1.10 0.93 0.93 1.21 ++ ++ 1.18 1.19
IDEA 0.87 0.69 0.70 0.91 0.68 0.74 0.89 0.67 0.74 0.98 0.94
HUFFMAN 0.81 0.79 0.82 0.78 0.77 0.76 0.78 0.88 0.87 0.83 0.93
NEURAL NET 0.83 0.89 0.86 0.89 0.91 0.88 0.92 ** ** ** **
LU DECOMPOSITION 1.11 1.13 1.12 1.25 1.19 1.19 1.34 1.15 1.17 1.35 1.34
===========================================================================
MEMORY INDEX 0.89 0.82 0.83 0.91 0.87 0.90 0.95 0.91 0.87 0.92 0.96
INTEGER INDEX 0.83 0.75 0.76 0.83 0.76 0.77 0.83 0.80 0.81 0.85 0.91
FLOATING-POINT INDEX 1.04 1.07 1.05 1.11 1.09 1.08 1.15 1.12 1.13 1.17 1.18
(0) gcc-2.7.2.3 -O6 -m486 -funroll-loops
(1) gcc-2.8.0 -O6 -m486 -funroll-loops
(2) gcc-2.8.0 -O6 -mpentium -funroll-loops
(3) gcc-2.8.0 -O6 -mpentiumpro -funroll-loops
(4) egcs-980115 (haifa sched) -O6 -m486 -funroll-loops
(5) egcs-980115 (haifa sched) -O6 -mpentium -funroll-loops
(6) egcs-980115 (haifa sched) -O6 -mpentiumpro -funroll-loops
(7) pgcc-980115 (haifa sched) -O6 -mpentiumpro -funroll-loops
(8) pgcc-980115 (haifa sched) -O6 -mpentiumpro -funroll-loops
(9) pgcc-980115 (haifa sched) -O6 -mpentiumpro -funroll-loops
(10) pgcc-980115 (haifa sched) -O6 -mamdk6 -funroll-loops
++ segmentation fault
** non-terminating
These problems are not K6 specific. They do occur on 486 and pentium, too.
--
"Nobody will ever need more than 640k RAM!" (Bill Gates)
"Windows 95 needs atleast 8 MB RAM." (Bill Gates)
"Nobody will ever need Windows 95." (logical conclusion)
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