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MPIO HD200 grey blitting: Use line reads for the pixel values as well. Almost doubles the ISR speed (47% -> 24% load), giving 42% faster greylib framebuffer updates.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27444 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2010-07-16 07:08:39 +00:00
parent bb236ce89c
commit 701dafdf30
1 changed files with 56 additions and 24 deletions
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80
firmware/target/coldfire/mpio/hd200/lcd-as-hd200.S
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@ -125,16 +125,16 @@ lcd_mono_data:
.type lcd_grey_data,@function
lcd_grey_data:
lea.l (-8*4, %sp), %sp
movem.l %d2-%d7/%a2-%a3, (%sp) /* save some registers */
movem.l (8*4+4, %sp), %a0-%a2 /* values, phases, length */
lea.l (-11*4, %sp), %sp
movem.l %d2-%d7/%a2-%a6, (%sp) /* save some registers */
movem.l (11*4+4, %sp), %a0-%a2 /* values, phases, length */
add.l %a2, %a2
lea.l (%a1, %a2.l*4), %a2 /* end address */
lea.l LCD_BASE_ADDRESS+2, %a3 /* LCD data port address */
moveq.l #24, %d4 /* shift count */
move.l #0x204081, %d5 /* bit shuffle factor */
moveq.l #12, %d2
moveq.l #8, %d2
add.l %a1, %d2
and.l #0xfffffff0, %d2 /* first line bound */
cmp.l %d2, %a2 /* end address lower than first line bound? */
@ -142,14 +142,14 @@ lcd_grey_data:
move.l %a2, %d2 /* -> adjust end address of head loop */
1:
cmp.l %a1, %d2
bls.s .g_head_tail_end
bls.s .g_hend
.g_head_tail:
/* process head pixels */
movem.l (%a1), %d0-%d1 /* fetch 8 pixel phases */
move.l %d0, %d2
and.l #0x80808080, %d2 /* %d2 = 0.......1.......2.......3....... */
eor.l %d2, %d0
eor.l %d2, %d0
add.l (%a0)+, %d0 /* add values to first 4 phases */
move.l %d1, %d3
@ -170,26 +170,24 @@ lcd_grey_data:
move.w %d2, (%a3) /* transfer second LCD byte */
.g_head_tail_end:
.g_hend:
cmp.l %a1, %a2
bls.w .g_end
lea.l (-8, %a2), %a2
bls.w .g_tend
subq.l #8, %a2
cmp.l %a1, %a2
bls.s .g_line_end
bls.s .g_lend
.g_line_loop:
/* loop that utilize line transfers */
/* loop that utilizes line transfers */
movem.l (%a1), %d0-%d3 /* fetch 2 * 8 pixels phases */
move.l %d0, %d6
and.l #0x80808080, %d6 /* %d6 = 0.......1.......2.......3....... */
eor.l %d6, %d0
add.l (%a0)+, %d0 /* add values to first 4 phases */
move.l %d1, %d7
and.l #0x80808080, %d7 /* %d7 = 4.......5.......6.......7....... */
eor.l %d7, %d1
add.l (%a0)+, %d1 /* add values to second 4 phases */
lsr.l #4, %d7 /* %d7 = ....4.......5.......6.......7... */
or.l %d7, %d6 /* %d6 = 0...4...1...5...2...6...3...7... */
@ -198,17 +196,22 @@ lcd_grey_data:
lsr.l %d4, %d6 /* %d6 = ........................01234567 */
move.w %d6, (%a3) /* transfer first LCD byte */
movem.l (%a0), %d7/%a4-%a6 /* fetch 2 * 8 pixel values */
lea.l (16, %a0), %a0
move.w %d6, (%a3) /* transfer second LCD byte */
add.l %d7, %d0
add.l %a4, %d1
move.l %d2, %d6
and.l #0x80808080, %d6 /* %d6 = 0.......1.......2.......3....... */
eor.l %d6, %d2
add.l (%a0)+, %d2 /* add values to first 4 phases */
move.l %d3, %d7
and.l #0x80808080, %d7 /* %d7 = 4.......5.......6.......7....... */
eor.l %d7, %d3
add.l (%a0)+, %d3 /* add values to second 4 phases */
lsr.l #4, %d7 /* %d7 = ....4.......5.......6.......7... */
or.l %d7, %d6 /* %d6 = 0...4...1...5...2...6...3...7... */
@ -216,24 +219,53 @@ lcd_grey_data:
not.l %d6 /* negate bits */
lsr.l %d4, %d6 /* %d6 = ........................01234567 */
add.l %a5, %d2
add.l %a6, %d3
move.w %d6, (%a3) /* transfer first LCD byte */
move.w %d6, (%a3) /* transfer second LCD byte */
movem.l %d0-%d3, (%a1) /* store 2 * 8 new pixel phases */
lea.l (16, %a1), %a1 /* advance pointer */
move.w %d6, (%a3) /* transfer second LCD byte */
cmp.l %a2, %a1
bls.s .g_line_loop
.g_line_end:
lea.l (8, %a2), %a2
.g_lend:
addq.l #8, %a2
cmp.l %a1, %a2
bls.s .g_end
bra.w .g_head_tail
bls.s .g_tend
.g_end:
movem.l (%sp), %d2-%d7/%a2-%a3
lea.l (8*4, %sp), %sp
/* process tail pixels */
movem.l (%a1), %d0-%d1 /* fetch 8 pixel phases */
move.l %d0, %d2
and.l #0x80808080, %d2 /* %d2 = 0.......1.......2.......3....... */
eor.l %d2, %d0
add.l (%a0)+, %d0 /* add values to first 4 phases */
move.l %d1, %d3
and.l #0x80808080, %d3 /* %d3 = 4.......5.......6.......7....... */
eor.l %d3, %d1
add.l (%a0)+, %d1 /* add values to second 4 phases */
lsr.l #4, %d3 /* %d3 = ....4.......5.......6.......7... */
or.l %d3, %d2 /* %d2 = 0...4...1...5...2...6...3...7... */
mulu.l %d5, %d2 /* %d2 = 01234567123.567.23..67..3...7... */
not.l %d2 /* negate bits */
lsr.l %d4, %d2 /* %d2 = ........................01234567 */
move.w %d2, (%a3) /* transfer first LCD byte */
movem.l %d0-%d1, (%a1) /* store 8 new pixel phases */
/* addq.l #8, %a1 not needed anymore */
move.w %d2, (%a3) /* transfer second LCD byte */
.g_tend:
movem.l (%sp), %d2-%d7/%a2-%a6
lea.l (11*4, %sp), %sp
rts
.grey_end:
.size lcd_grey_data,.grey_end-lcd_grey_data