Commit Graph

4 Commits

Author SHA1 Message Date
Jeff Muizelaar
e6b3a462fa Bug 548612. qcms: Reduce size of output lookup tables. r=bgirard
We currently use a larger output lookup table than we probably need. Switch to
a common define for the table size and lower it. The should also give a small
improvement to startup time because we have fewer lookup table entries to
compute.
2010-06-04 14:48:30 -04:00
Steve Snyder
726ac89b07 Bug 512865. qcms: Improve SSE2 performance, add SSE support. r=jrmuizel
This patch greatly improves the performance of QCMS transformations on x86 &
x86_64 systems.  Some notes:

0. On 32-bit x86 systems it does runtime selection between non-SIMD, SSE, and
SSE2 code paths.

1. On x86_64 systems the SSE2 code path is always taken.  The non-SIMD and SSE
code paths are left intact, but contemporary versions of the GCC and MSVC
compilers will see that they cannot be reached and optimize them away.

2. The execution of the SSE2 code path is reduced by 67%, relative to the
original Intel/Microsoft formatted ASM code.  The relative performance is seen
on a Pentium4 (Northwood) 2.4GHz CPU with DDR1 RAM.

3. The SSE code path provides a 80% reduction in execution time, relative to
the non-SIMD code path.  The relative performance is seen on a Pentium3
(Coppermine) 1.26GHz CPU with SDRAM.

4. The code has been split out into separate files so that it can be built
with different cflags (-msse, and -msse2) when using gcc.

5. Try to land again, this time with __attribute__((__force_align_arg_pointer__))
to avoid crashes on linux.
2009-10-01 14:19:41 -04:00
Jeff Muizelaar
3f907e258a Backed out changeset cb4f078cc8cb (bug 512865)
Was causing crashes on the leak test box.
2009-09-24 23:35:53 -04:00
Steve Snyder
7e089e6fae Bug 512865. qcms: Improve SSE2 performance, add SSE support. r=jrmuizel
This patch greatly improves the performance of QCMS transformations on x86 &
x86_64 systems.  Some notes:

0. On 32-bit x86 systems it does runtime selection between non-SIMD, SSE, and
SSE2 code paths.

1. On x86_64 systems the SSE2 code path is always taken.  The non-SIMD and SSE
code paths are left intact, but contemporary versions of the GCC and MSVC
compilers will see that they cannot be reached and optimize them away.

2. The execution of the SSE2 code path is reduced by 67%, relative to the
original Intel/Microsoft formatted ASM code.  The relative performance is seen
on a Pentium4 (Northwood) 2.4GHz CPU with DDR1 RAM.

3. The SSE code path provides a 80% reduction in execution time, relative to
the non-SIMD code path.  The relative performance is seen on a Pentium3
(Coppermine) 1.26GHz CPU with SDRAM.

4. The code has been split out into separate files so that it can be built
with different cflags (-msse, and -msse2) when using gcc.
2009-09-24 11:58:24 -04:00