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core: Document ARM-optimised svolume code a bit

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This commit is contained in:
Arun Raghavan 2012-10-18 10:42:48 +05:30
parent b87067a007
commit 600e3daa56
1 changed files with 7 additions and 7 deletions
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14
src/pulsecore/svolume_arm.c
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@ -50,19 +50,19 @@ static void pa_volume_s16ne_arm(int16_t *samples, const int32_t *volumes, unsign
ve = volumes + channels;
__asm__ __volatile__ (
" mov r6, %1 \n\t"
" mov r6, %1 \n\t" /* r6 = volumes */
" mov %3, %3, LSR #1 \n\t" /* length /= sizeof (int16_t) */
" tst %3, #1 \n\t" /* check for odd samples */
" beq 2f \n\t"
"1: \n\t"
" ldr r0, [r6], #4 \n\t" /* odd samples volumes */
" ldrh r2, [%0] \n\t"
"1: \n\t" /* odd samples volumes */
" ldr r0, [r6], #4 \n\t" /* r0 = volume */
" ldrh r2, [%0] \n\t" /* r2 = sample */
" smulwb r0, r0, r2 \n\t"
" ssat r0, #16, r0 \n\t"
" smulwb r0, r0, r2 \n\t" /* r0 = (r0 * r2) >> 16 */
" ssat r0, #16, r0 \n\t" /* r0 = PA_CLAMP(r0, 0x7FFF) */
" strh r0, [%0], #2 \n\t"
" strh r0, [%0], #2 \n\t" /* sample = r0 */
MOD_INC()