Mail Archives: pgcc/1999/03/03/03:58:41
| Message-ID: | <000b01be6553$1b412e20$2f8230d4@main.medtech.ru>
|
| From: | "Eugene M. Indenbom" <bom AT classic DOT iki DOT rssi DOT ru>
|
| To: | <pgcc AT delorie DOT com>
|
| Subject: | gcc-2.7.2.3 optimizes gzip better than pgcc-1.1.1
|
| Date: | Wed, 3 Mar 1999 11:50:42 +0300
|
| MIME-Version: | 1.0
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| X-Priority: | 3
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| X-MSMail-Priority: | Normal
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| X-Mailer: | Microsoft Outlook Express 4.72.3155.0
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| X-MimeOLE: | Produced By Microsoft MimeOLE V4.72.3155.0
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| Reply-To: | pgcc AT delorie DOT com
|
This is a multi-part message in MIME format.
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I finally find the version of gcc that generates better gzip code than pgcc.
This is gcc-2.7.2.3. Here goes comparision (gzip-1.2.4a)
$ make
CC="/home/ddict/glibc/pgcc-1.1.1/gcc/xgcc -B/home/ddict/glibc/pgcc-1.1.1/gcc
/" \
CFLAGS="-O6 -mpentiumpro"
$ time ./gzip -cd egcs-1.1.1.tar.gz > tmp.gz
real 0m10.693s
user 0m7.720s
sys 0m2.050s
As I already wrote the best optimization is -Os. Is it surprise?
After attempt to use CFLAGS+=-pg I got a seg fault. BUG!!!!!
Here goes gprof output (I do not use gcov as there is no gcov in 2.7.2.3):
(CFLAGS=-O2 -mpentiumpro -pg, full output attached to this message as
gprof.pgcc):
% cumulative self self total
time seconds seconds calls ms/call ms/call name
55.87 3.90 3.90 1602 2.43 2.43 updcrc
43.41 6.93 3.03 239 12.68 29.01 inflate_codes
0.57 6.97 0.04 717 0.06 0.06 huft_build
0.14 6.98 0.01 1600 0.01 0.01 write_buf
Now gcc-2.7.2.3:
$ make CC="usr/bin/gcc -Busr/lib/gcc-lib/i586-unknown-linux-gnu/2.7.2.3/"
CFLAGS="-O6"
$ time ./gzip -cd egcs-1.1.1.tar.gz > tmp.gz
real 0m8.756s
user 0m6.110s
sys 0m2.310s
gprof output, CFLAGS=-O6 -pg, , full output attached to this message as
gprof.ogcc:
% cumulative self self total
time seconds seconds calls ms/call ms/call name
50.29 2.63 2.63 239 11.00 21.50 inflate_codes
47.80 5.13 2.50 1600 1.56 1.57 flush_window
1.34 5.20 0.07 717 0.10 0.10 huft_build
0.38 5.22 0.02 239 0.08 21.88 inflate_dynamic
0.19 5.23 0.01 1600 0.01 0.01 write_buf
Note that updcrc and flush_window are the same thing:
flush_window is effectively a wrapper for updcrc that was not
inlined for some reason by pgcc in -O2 compilation.
gcc-2.7.2.3 -S output for flush_window goes here:
.align 16
.globl flush_window
.type flush_window,@function
flush_window:
pushl %ebp
movl %esp,%ebp
pushl %edi
pushl %esi
pushl %ebx
movl outcnt,%eax
testl %eax,%eax
je .L242
movl $window,%ebx
movl %eax,%esi
testl %ebx,%ebx
jne .L245
movl $-1,%ecx
jmp .L246
.align 16
.L245:
movl crc.78,%ecx
.align 4
.L248:
movb %cl,%al
xorb (%ebx),%al
movzbl %al,%edx
movl %ecx,%eax
shrl $8,%eax
movl crc_32_tab(,%edx,4),%ecx
xorl %eax,%ecx
incl %ebx
decl %esi
jne .L248
.L246:
movl %ecx,crc.78
cmpl $0,test
jne .L252
movl outcnt,%eax
pushl %eax
pushl $window
movl ofd,%eax
pushl %eax
call write_buf
.L252:
movl outcnt,%edi
addl %edi,bytes_out
movl $0,outcnt
.L242:
leal -12(%ebp),%esp
popl %ebx
popl %esi
popl %edi
movl %ebp,%esp
popl %ebp
ret
.Lfe6:
.size flush_window,.Lfe6-flush_window
Happy hacking!!! Sincerely Yours, Eugene.
P.S If you do not believe me just try gzip from RedHat 5.2.
It is gcc-2.7.2.3 compiled and glibc based.
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