Can old version of GCC used with BSD 7.0 without facing any compatibility
problem?
Thanks,
Kailash
-Original Message-
From: Wojciech Puchar [mailto:woj...@wojtek.tensor.gdynia.pl]
Sent: Wednesday, February 18, 2009 1:46 PM
To: Kailash Kailash
Cc: freebsd-questions@freebsd.org
Subject: Re: FreeBSD 7.O compiled code is very slow
looks like they improved gcc. you can install older from ports.
On Wed, 18 Feb 2009, Kailash Kailash wrote:
I am using FreeBSD 7.0 in 64 BIT mode. Same code compiled on BSD 7.0 runs
50% speed (as expected by CPU and code architecture) compared to BSD 6.2.
Here is one real code with binary output. On 3.0 GHz Woodcrest processor,
I
am able to copy from one cache to another cache at the speed of
24Gbytes/second verses 12 Gbytes/second. Any help is appreciated.
Thanks,
Kailash
Source-code:
#define BACKWARD_MEMCOPY_WITH_TYPE(dp, sp, len, type)
BACKWARD_MEMCOPY((type*)(dp), (const type*)(sp),
((len)+(sizeof(type)-1))/sizeof(type))
#define BACKWARD_MEMCOPY(dp, sp, len) \
do { \
smwbits __len = len;/* must be signed value */ \
while (--__len = 0) \
(dp)[__len] = (sp)[__len]; \
} while (0)
BSD 6.2 code
0x004353b2 smcli_memory_copy_performance+434: mov
0x8(%rbp,%rdx,8),%rax
0x004353b7 smcli_memory_copy_performance+439: mov
%rax,0x48(%r12,%rdx,8)
0x004353bc smcli_memory_copy_performance+444: dec%rdx
0x004353bf smcli_memory_copy_performance+447: jns0x4353b2
smcli_memory_copy_performance+434
BSD 7.0 code
0x0040cb80 smcli_memory_copy_performance+272:mov
0xfff8(%rsi),%rax
0x0040cb84 smcli_memory_copy_performance+276:mov
%rax,0xfff8(%rcx)
0x0040cb88 smcli_memory_copy_performance+280:sub
$0x8,%rsi
0x0040cb8c smcli_memory_copy_performance+284:sub
$0x8,%rcx
0x0040cb90 smcli_memory_copy_performance+288:sub
$0x1,%rdx
0x0040cb94 smcli_memory_copy_performance+292:jns
0x40cb80 smcli_memory_copy_performance2+272
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