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HDD6330: speedup lcd_blit_yuv() function (~4%).

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28828 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Szymon Dziok 2010-12-13 23:51:48 +00:00
parent c43fb3cf1b
commit 703db94de6
1 changed files with 25 additions and 34 deletions
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59
firmware/target/arm/philips/hdd6330/lcd-as-hdd6330.S
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@ -48,38 +48,34 @@ lcd_yuv_write_inner_loop:
ldrb r7, [r1], #1 @ *usrc++
ldrb r8, [r2], #1 @ *vsrc++
add r10, r8, r8, asl #2 @ 101* vsrc
sub r7, r7, #128 @ Cb -= 128
sub r8, r8, #128 @ Cr -= 128
add r10, r8, r8, asl #2 @ Cr*101
add r10, r10, r8, asl #5
add r10, r10, r8, asl #6
sub r10, r10, #0x3600
sub r10, r10, #0x0020 @ -13856 (ROUNDOFFSR)
add r11, r8, r8, asl #1 @ 51*vsrc + 24*usrc
add r11, r8, r8, asl #1 @ Cr*51 + Cb*24
add r11, r11, r11, asl #4
add r11, r11, r7, asl #3
add r11, r11, r7, asl #4
mov r12, #0x2100
add r12, r12, #0x60 @ +8544 (ROUNDOFFSG) - r11
rsb r11, r11, r12
mov r12, r7, asl #7 @ 128 * usrc
sub r12, r12, #0x4300
sub r12, r12, #0x00a0 @ -17312 (ROUNDOFFSB)
add r12, r7, #2 @ r12 = bu = (Cb*128 + 256) >> 9
mov r12, r12, asr #2
add r10, r10, #256 @ r10 = rv = (Cr*101 + 256) >> 9
mov r10, r10, asr #9
rsb r11, r11, #128 @ r11 = guv = (-r11 + 128) >> 8
mov r11, r11, asr #8
@ pixel_1
ldrb r8, [r0], #1 @ *ysrc++
mov r7, r8, asl #1
add r7, r7, r8, asl #3
add r7, r7, r8, asl #6 @ ysrc * 74
ldrb r7, [r0], #1 @ *ysrc++
sub r7, r7, #16 @ Y = (Y' - 16) * 37
add r8, r7, r7, asl #2
add r7, r8, r7, asl #5
add r9, r10, r7
mov r9, r9, asr #9 @ R
add r8, r11, r7
mov r8, r8, asr #8 @ G
add r7, r12, r7
mov r7, r7, asr #9 @ B
add r9, r10, r7, asr #8 @ R = (Y >> 8) + rv
add r8, r11, r7, asr #7 @ G = (Y >> 7) + guv
add r7, r12, r7, asr #8 @ B = (Y >> 8) + bu
cmp r9, #31 @ clamp R
mvnhi r9, r9, asr #31
@ -101,19 +97,14 @@ lcd_yuv_write_inner_loop:
add r6, r7, r6, lsr #8
@ pixel_2
ldrb r8, [r0], #1 @ *ysrc++
mov r7, r8, asl #1
add r7, r7, r8, asl #3
add r7, r7, r8, asl #6 @ ysrc * 74
ldrb r7, [r0], #1 @ *ysrc++
sub r7, r7, #16 @ Y = (Y' - 16) * 37
add r8, r7, r7, asl #2
add r7, r8, r7, asl #5
add r9, r10, r7
mov r9, r9, asr #9 @ R
add r8, r11, r7
mov r8, r8, asr #8 @ G
add r7, r12, r7
mov r7, r7, asr #9 @ B
add r9, r10, r7, asr #8 @ R = (Y >> 8) + rv
add r8, r11, r7, asr #7 @ G = (Y >> 7) + guv
add r7, r12, r7, asr #8 @ B = (Y >> 8) + bu
cmp r9, #31 @ clamp R
mvnhi r9, r9, asr #31