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authorJens Arnold <amiconn@rockbox.org>2010-05-31 20:13:27 +0000
committerJens Arnold <amiconn@rockbox.org>2010-05-31 20:13:27 +0000
commit64adb32cbfc805c01084ff935049998846c70dcd (patch)
tree98a9146856353fd6be1e5822099f76bc7b356e07 /firmware/target/arm/olympus/mrobe-100
parent85fd2d8be90ab3eb9f134180357725a60f988243 (diff)
downloadrockbox-64adb32cbfc805c01084ff935049998846c70dcd.tar.gz
rockbox-64adb32cbfc805c01084ff935049998846c70dcd.zip
Port the greylib blitting optimisation to m:robe 100. It's even more efficient on monochrome LCDs - about 20% ISR speedup.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26435 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm/olympus/mrobe-100')
-rw-r--r--firmware/target/arm/olympus/mrobe-100/lcd-as-mr100.S42
1 files changed, 15 insertions, 27 deletions
diff --git a/firmware/target/arm/olympus/mrobe-100/lcd-as-mr100.S b/firmware/target/arm/olympus/mrobe-100/lcd-as-mr100.S
index 2aede6d5e7..6db6c7efad 100644
--- a/firmware/target/arm/olympus/mrobe-100/lcd-as-mr100.S
+++ b/firmware/target/arm/olympus/mrobe-100/lcd-as-mr100.S
@@ -74,39 +74,27 @@ lcd_grey_data:
ldr lr, =LCD1_BASE
.greyloop:
- ldmia r1, {r3-r4} /* Fetch 8 pixel phases */
- ldmia r0!, {r5-r6} /* Fetch 8 pixel values */
-
- mov r7, #0xff
- tst r3, #0x80
- biceq r7, r7, #0x80
- tst r3, #0x8000
- biceq r7, r7, #0x40
- tst r3, #0x800000
- biceq r7, r7, #0x20
- tst r3, #0x80000000
- biceq r7, r7, #0x10
+ ldmia r1, {r3-r4}
+
+ and r5, r12, r3 /* r5 = 3.......2.......1.......0....... */
+ and r6, r12, r4 /* r6 = 7.......6.......5.......4....... */
+ orr r5, r5, r6, lsr #4 /* r5 = 3...7...2...6...1...5...0...4... */
+ orr r5, r5, r5, lsr #9 /* r5 = 3...7...23..67..12..56..01..45.. */
+ orr r5, r5, r5, lsr #9 /* r5 = 3...7...23..67..123.567.012.456. */
+ orr r5, r5, r5, lsr #9 /* r5 = 3...7...23..67..123.567.01234567 */
+
+ ldmia r0!, {r6-r7}
bic r3, r3, r12
- add r3, r3, r5
-
- tst r4, #0x80
- biceq r7, r7, #0x08
- tst r4, #0x8000
- biceq r7, r7, #0x04
- tst r4, #0x800000
- biceq r7, r7, #0x02
- tst r4, #0x80000000
- biceq r7, r7, #0x01
+ add r3, r3, r6
bic r4, r4, r12
- add r4, r4, r6
-
+ add r4, r4, r7
stmia r1!, {r3-r4}
1:
- ldr r5, [lr]
- tst r5, #LCD1_BUSY_MASK
+ ldr r6, [lr]
+ tst r6, #LCD1_BUSY_MASK
bne 1b
- str r7, [lr, #0x10]
+ str r5, [lr, #0x10]
subs r2, r2, #1
bne .greyloop