According to Agner Fog in optimizing_assembly.pdf:
"... write to a partial register may result in false dependencies
between instructions, so it is better to avoid it."
Patch-from: lvqcl <lvqcl.mail@gmail.com>
GCC generates slow ia32 code for FLAC__lpc_restore_signal_wide() and
FLAC__lpc_compute_residual_from_qlp_coefficients_wide() so 24-bit
encoding/decoding is slower for GCC compile than for MSVS or ICC
compile. This patch adds ia32 asm versions of these functions.
Patch-from: lvqcl <lvqcl.mail@gmail.com>
According to Agner Fog, "...you must make sure that all calls
are matched with returns. Never jump out of a subroutine without
a return and never use a return as an indirect jump."
(see paragraph 3.15 in microarchitecture.pdf and
examples 3.5a and 3.5b in optimizing_assembly.pdf)
Patch-from: lvqcl <lvqcl.mail@gmail.com>
For the 32 bit x86 ASM functions there were already versions of this
function for lags (N = 4, 8, 12). They require lpc_order less than N.
The best compression preset (flac -8) uses lpc_order up to 12; it
means that during encoding FLAC also uses unaccelerated C function.
Patch-from: lvqcl <lvqcl.mail@gmail.com>
Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
