Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

libmusepack: use postindexing on the pointer when storing to increment it for free, saves another instruction in the loop in mpc_decoder_windowing_D speed difference is in the noise though.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28492 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nils Wallménius 2010-11-05 16:21:25 +00:00
parent 34fb311638
commit f174c3513b
1 changed files with 3 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
apps/codecs/libmusepack/synth_filter_arm.S
View file

@ -238,13 +238,12 @@ mpc_decoder_windowing_D:
/* store Data[01..15] */ /* store Data[01..15] */
mov r8, r8, lsr #16 mov r8, r8, lsr #16
orr r8, r8, r9, lsl #16 /* (lo>>16) || (hi<<16) */ orr r8, r8, r9, lsl #16 /* (lo>>16) || (hi<<16) */
str r8, [r0] /* store Data */
/* store Data[31..17] */ /* store Data[31..17] */
mov r10, r10, lsr #16 mov r10, r10, lsr #16
orr r10, r10, r11, lsl #16 /* (lo>>16) || (hi<<16) */ orr r10, r10, r11, lsl #16 /* (lo>>16) || (hi<<16) */
rsb r10, r10, #0 /* r10 = -r10 */ rsb r10, r10, #0 /* r10 = -r10 */
str r10, [r0, lr] /* store Data */ str r10, [r0, lr] /* store Data */
add r0, r0, #4 /* r0++ */ str r8, [r0], #4 /* store Data */
/* correct adresses for next loop */ /* correct adresses for next loop */
sub r12, r12, #4 /* r12 = V-- */ sub r12, r12, #4 /* r12 = V-- */
add r1, r1, #4 /* r1 = V++ */ add r1, r1, #4 /* r1 = V++ */
@ -441,13 +440,12 @@ mpc_decoder_windowing_D:
/* store Data[01..15] */ /* store Data[01..15] */
mov r8, r8, lsr #16 mov r8, r8, lsr #16
orr r8, r8, r9, lsl #16 /* (lo>>16) || (hi<<16) */ orr r8, r8, r9, lsl #16 /* (lo>>16) || (hi<<16) */
str r8, [r0] /* store Data */
/* store Data[31..17] */ /* store Data[31..17] */
mov r10, r10, lsr #16 mov r10, r10, lsr #16
orr r10, r10, r11, lsl #16 /* (lo>>16) || (hi<<16) */ orr r10, r10, r11, lsl #16 /* (lo>>16) || (hi<<16) */
rsb r10, r10, #0 /* r10 = -r10 */ rsb r10, r10, #0 /* r10 = -r10 */
str r10, [r0, lr] /* store Data */ str r10, [r0, lr] /* store Data */
add r0, r0, #4 /* r0++ */ str r8, [r0], #4 /* store Data */
/* correct adresses for next loop */ /* correct adresses for next loop */
sub r12, r12, #4 /* r12 = V-- */ sub r12, r12, #4 /* r12 = V-- */
add r1, r1, #4 /* r1 = V++ */ add r1, r1, #4 /* r1 = V++ */
@ -641,11 +639,10 @@ mpc_decoder_windowing_D:
rsb r11, r11, #0 /* r11 = -r11 */ rsb r11, r11, #0 /* r11 = -r11 */
/* store Data[01..15] */ /* store Data[01..15] */
mov r9, r9, lsl #2 mov r9, r9, lsl #2
str r9, [r0] /* store Data */
/* store Data[31..17] */ /* store Data[31..17] */
mov r11, r11, lsl #2 mov r11, r11, lsl #2
str r11, [r0, lr] /* store Data */ str r11, [r0, lr] /* store Data */
add r0, r0, #4 /* r0++ */ str r9, [r0], #4 /* store Data */
/* next loop */ /* next loop */
subs lr, lr, #8 subs lr, lr, #8
bgt .loop15 bgt .loop15