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opus: arm asm for C_MULC

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speeds up decoding of a 64kbps test_file by 1.5MHz on c200 (pp)
and 1.9MHz on fuzev1 (amsv1)

Change-Id: I1db460b634eba608c3e00541d96fc93d5a05710b
Signed-off-by: Nils Wallménius <nils@rockbox.org>
This commit is contained in:
Andree Buschmann 2012-10-10 22:49:37 +02:00 • committed by Nils Wallménius
parent 2326f1517e
commit 823d090d6b
1 changed files with 22 additions and 0 deletions
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22
lib/rbcodec/codecs/libopus/celt/_kiss_fft_guts.h
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@ -80,6 +80,28 @@
: [ap] "a" (&(a)), [bp] "a" (&(b)) \
: "d0", "d1", "d2", "d3", "cc"); \
}
#elif defined(CPU_ARM)
# define C_MULC(m,a,b) \
{ \
asm volatile( \
"ldmia %[ap], {r0,r1} \n\t" \
"ldrsh r2, [%[bp], #0] \n\t" \
"ldrsh r3, [%[bp], #2] \n\t" \
\
"smull r4, %[mr], r0, r2 \n\t" \
"smlal r4, %[mr], r1, r3 \n\t" \
"mov r4, r4, lsr #15 \n\t" \
"orr %[mr], r4, %[mr], lsl #17 \n\t" \
\
"smull r4, %[mi], r1, r2 \n\t" \
"rsb r3, r3, #0 \n\t" \
"smlal r4, %[mi], r0, r3 \n\t" \
"mov r4, r4, lsr #15 \n\t" \
"orr %[mi], r4, %[mi], lsl #17 \n\t" \
: [mr] "=r" ((m).r), [mi] "=r" ((m).i) \
: [ap] "r" (&(a)), [bp] "r" (&(b)) \
: "r0", "r1", "r2", "r3", "r4"); \
}
#else
# define C_MULC(m,a,b) \
do{ (m).r = ADD32(S_MUL((a).r,(b).r) , S_MUL((a).i,(b).i)); \