RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-06 15:48:05 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

fast dma

Browse source 
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@35 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-02-09 23:39:03 +00:00
parent e11c55481f
commit cea6590346
10 changed files with 69 additions and 99 deletions
Download patch file Download diff file Expand all files Collapse all files

58
Pico/sound/mix.s
View file

@ -1,63 +1,5 @@
@ vim:filetype=armasm
.global memcpy32 @ int *dest, int *src, int count
memcpy32:
stmfd sp!, {r4,lr}
subs r2, r2, #4
bmi mcp32_fin
mcp32_loop:
ldmia r1!, {r3,r4,r12,lr}
subs r2, r2, #4
stmia r0!, {r3,r4,r12,lr}
bpl mcp32_loop
mcp32_fin:
tst r2, #3
ldmeqfd sp!, {r4,pc}
tst r2, #1
ldrne r3, [r1], #4
strne r3, [r0], #4
mcp32_no_unal1:
tst r2, #2
ldmneia r1!, {r3,r12}
ldmfd sp!, {r4,lr}
stmneia r0!, {r3,r12}
bx lr
.global memset32 @ int *dest, int c, int count
memset32:
stmfd sp!, {lr}
mov r3, r1
subs r2, r2, #4
bmi mst32_fin
mov r12,r1
mov lr, r1
mst32_loop:
subs r2, r2, #4
stmia r0!, {r1,r3,r12,lr}
bpl mst32_loop
mst32_fin:
tst r2, #1
strne r1, [r0], #4
tst r2, #2
stmneia r0!, {r1,r3}
ldmfd sp!, {lr}
bx lr
@ this assumes src is word aligned
.global mix_16h_to_32 @ int *dest, short *src, int count