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util/spkmodem-recv: also cache sep_pos in decode

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yet another optimisation for weaker compilers - but
some modern compilers may not optimise well for this
code either.

this reduces the amount of references to the struct,
which is very expensive (48000 times per second) on
very old CPUs.

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-12 19:57:24 +00:00
parent 9f41591a46
commit 8ccaff0d8e
1 changed files with 8 additions and 5 deletions
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util/spkmodem_recv/spkmodem-recv.c
+8 -5
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@@ -180,12 +180,14 @@ decode_pulse(struct decoder_state *st)
unsigned char old_ring, old_sep;
unsigned char new_pulse;
int ringpos;
int sep_pos;
signed short sample;
ringpos = st->ringpos;
sep_pos = st->sep_pos;
old_ring = st->pulse[ringpos];
old_sep = st->pulse[st->sep_pos];
old_sep = st->pulse[sep_pos];
st->freq_data -= old_ring;
st->freq_data += old_sep;
@@ -206,11 +208,12 @@ decode_pulse(struct decoder_state *st)
if (ringpos >= MAX_SAMPLES)
ringpos = 0;
st->ringpos = ringpos;
sep_pos++;
if (sep_pos >= MAX_SAMPLES)
sep_pos = 0;
st->sep_pos++;
if (st->sep_pos >= MAX_SAMPLES)
st->sep_pos = 0;
st->ringpos = ringpos;
st->sep_pos = sep_pos;
st->sample_count++;
}