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core: Add ARM NEON optimized sample conversion code

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final:
* includes some minor style fixes and build-time changes to allow
  building a single binary for neon and non-neon systems
v4:
* fix for sample length < 4
v3:
* convert from intrinsics to inline assembly
v2:
* load and store data with vld1/vld1q and vst1/vst1q, resp., to work
  around alignment issues of compiler-generated vldmia instruction
* remove redundant check for NEON flags

Ubuntu/Linaro gcc 4.6.3
arm-linux-gnueabi-gcc -O2 -mcpu=cortex-a8 -mfloat-abi=softfp -mfpu=neon

runtime on beagle-xm:

D: [pulseaudio] sconv_neon.c: checking NEON sconv_s16le_from_float
I: [pulseaudio] sconv_neon.c: NEON: 3754 usec.
I: [pulseaudio] sconv_neon.c: ref: 58594 usec.
D: [pulseaudio] sconv_neon.c: checking NEON sconv_s16le_to_float
I: [pulseaudio] sconv_neon.c: NEON: 1831 usec.
I: [pulseaudio] sconv_neon.c: ref: 10528 usec.
I: [pulseaudio] sconv_neon.c: Initialising ARM NEON optimized conversions.

conversion may be off by one for some samples due to rounding issues
This commit is contained in:
Peter Meerwald 2012-10-23 17:54:57 +02:00 • committed by Arun Raghavan
parent 4171df3019
commit 1319c4533a
6 changed files with 193 additions and 1 deletions
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4
src/pulsecore/cpu-arm.c
View file

@ -142,6 +142,10 @@ pa_bool_t pa_cpu_init_arm(pa_cpu_arm_flag_t *flags) {
if (*flags & PA_CPU_ARM_V6)
pa_volume_func_init_arm(*flags);
#ifdef HAVE_NEON
if (*flags & PA_CPU_ARM_NEON)
pa_convert_func_init_neon(*flags);
#endif
return TRUE;