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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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8
src/pulsecore/cpu-arm.h
View file

@ -26,6 +26,10 @@
#include <stdint.h>
#include <pulsecore/macro.h>
#ifndef PACKAGE
#error "Please include config.h before including this file!"
#endif
typedef enum pa_cpu_arm_flag {
PA_CPU_ARM_V6 = (1 << 0),
PA_CPU_ARM_V7 = (1 << 1),
@ -41,4 +45,8 @@ pa_bool_t pa_cpu_init_arm(pa_cpu_arm_flag_t *flags);
/* some optimized functions */
void pa_volume_func_init_arm(pa_cpu_arm_flag_t flags);
#ifdef HAVE_NEON
void pa_convert_func_init_neon(pa_cpu_arm_flag_t flags);
#endif
#endif /* foocpuarmhfoo */