diff options
| author | Andree Buschmann <AndreeBuschmann@t-online.de> | 2010-05-10 20:35:57 +0000 |
|---|---|---|
| committer | Andree Buschmann <AndreeBuschmann@t-online.de> | 2010-05-10 20:35:57 +0000 |
| commit | 7d21e5ab32ef24724c201b5ffc4df3a2637966e7 (patch) | |
| tree | 726bab88f2f3f3849eca32e562f55cd7389e6673 /firmware | |
| parent | 18b5488a4a5c84e64f1d45537ee0e46055f83482 (diff) | |
No need to use alternating registers for dual register read/write sequence. Correct comment.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25939 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/target/arm/ipod/video/lcd-as-video.S | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/firmware/target/arm/ipod/video/lcd-as-video.S b/firmware/target/arm/ipod/video/lcd-as-video.S index 21a04a6529..fa88dbc940 100644 --- a/firmware/target/arm/ipod/video/lcd-as-video.S +++ b/firmware/target/arm/ipod/video/lcd-as-video.S @@ -26,8 +26,7 @@ * int pixelcount); * * Writes pixelcount pixels from src-pointer (lcd_framebuffer) to BCM dataport. - * Use the sequence ld 2, wr 2, ld 2, wr 2 with alternating registers for best - * performance. + * Use the sequence 2:2:2:2 (2 = read/write 2 regs) for best performance. */ .align 2 .global lcd_write_data @@ -41,12 +40,12 @@ lcd_write_data: /* r1 = pixel count, must be even */ .loop16: ldmgeia r0!, {r2-r3} stmgeia lr, {r2-r3} - ldmgeia r0!, {r4, r12} - stmgeia lr, {r4, r12} ldmgeia r0!, {r2-r3} stmgeia lr, {r2-r3} - ldmgeia r0!, {r4, r12} - stmgeia lr, {r4, r12} + ldmgeia r0!, {r2-r3} + stmgeia lr, {r2-r3} + ldmgeia r0!, {r2-r3} + stmgeia lr, {r2-r3} subges r1, r1, #16 bge .loop16 |