Pick up sfront 0.65 09/07/00 at:
http://www.cs.berkeley.edu/~lazzaro/sa/
Change log message:
[1] C code generated for
SAOL and SASL wavetables
compiles much quicker and
runs with improved cache
behavior. C code created
for the "sample" wavetable
generator no longer includes
an WAV or AIFF parser,
and moderately-sized constant
tables for all generators are
computed by sfront and placed
into the sa.c file as constant
float arrays. On some machine/
compiler configurations,
the sfront -hexdata flag
offers additional compilation
speedup, by encoding arrays
as hexadecimal strings.
[2] C code generated for
wide oparrays compiles much
quicker and runs with improved
cache behavior (thanks to
Richard Dobson).
[3] Many sa.c memory leaks
involving wavetables have
been fixed, reducing the
working memory space of
table-intensive programs.
[4] Bugfixes involving the
dur standard name (thanks to
Tobiah), empty opcode
return() statements (thanks
to Ross Bencina), name
space collisions (thanks to
Aaron Finch), oparrays, and
wavetables.
-----
Several test examples drove
these optimizations:
[A] The perc example, which
took sfront 0.64 a long time
to compile, due to lengthy
WAV file reading code. Sfront
0.65 produces code that
compiles 15X faster on perc:
0.64 0.65
sfront 0.11s 0.09s
run
time
gcc 50s 3.3s
run
time
[B] A simple sdiff2mp4 example
of a trumpet blast, created
by Richard Dobson. Sfront64
behaved very poorly for this
MP4 file, taking many many
minutes to compile the sa.c
file, which ran slowly. One
major problem was this
oparray call:
instr track(){
oparray oscil[ 1024 ];
}
which sfront created 1024
functions for! A second
problem was the 228 SASL
data wavegenerator tables,
each of which sfront generated
several hundreds of lines of code
for. Sfront 0.65 generates
sensible oparray and SASL table
C code for these SAOL constructs,
here's a performance measurment
of the trumpet blast for 0.65:
--% /usr/bin/time -p sfront65 -aout linux -playback \ -orc trump.saol -sco trump.sasl -latency 0.743039
sfront, a SAOL to C translator. Version 0.65 09/07/00. Run sfront with -license option for Copyright/License info.
real 0.71 user 0.58 sys 0.13
% /usr/bin/time -p gcc -O3 sa.c -lm -o sa real 3.84 user 3.73 sys 0.11
--
and the trumpet blast plays in real-time on my 450MHz PIII.
------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------
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