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No need to use alternating registers for dual register read/write sequence. Correct comment.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25939 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann 2010-05-10 20:35:57 +00:00
parent 18b5488a4a
commit 7d21e5ab32
1 changed files with 5 additions and 6 deletions
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11
firmware/target/arm/ipod/video/lcd-as-video.S
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@ -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