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Greyscale library: Very slight speedup on archos.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16021 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2008-01-08 01:09:31 +00:00
parent 54aeadaa6b
commit 08e6c6bc2a
1 changed files with 29 additions and 30 deletions
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59
firmware/target/sh/archos/lcd-as-archos-bitmap.S
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@ -240,112 +240,111 @@ _lcd_grey_data:
* this would significantly decrease performance. */
mov.b @r3, r0 /* r0 = PBDRL */
mov r4, r8 /* copy start address */
mov #0x80, r9 /* for phase modification - "or #imm,xx" only allows r0 */
mov.b @r4+, r6 /* fetch first pixel phase */
or #(LCD_DS|LCD_SD), r0 /* r0 |= LCD_DS|LCD_SD */
and #(~(LCD_CS|LCD_SC)), r0 /* r0 &= ~(LCD_CS|LCD_SC) */
neg r0, r2 /* r2 = 0 - r0 */
mov #0x80, r9 /* for phase modification - "or #imm,xx" only allows r0 */
mov #-3, r0 /* offset for storing phase */
/* loop exploits that SD is on bit 0 for recorders and Ondios */
.greyloop:
cmp/pz r6 /* phase non-negative? */
mov.b @r4+, r0 /* fetch pixel value */
mov.b @r4+, r8 /* fetch pixel value */
negc r2, r1 /* T -> SD, SC low */
mov.b r1, @r3 /* set port */
or r9, r6 /* r6 -= (r6 >= 0) ? 128 : 0; */
mov.b @r4+, r7 /* fetch next pixel phase */
add #(LCD_SC), r1 /* rise SC */
mov.b r1, @r3 /* set port */
add r6, r0 /* calculate new phase */
mov.b r0, @r8 /* store phase */
add r8, r6 /* calculate new phase */
mov.b r6, @(r0,r4) /* store phase */
cmp/pz r7
mov.b @r4+, r0
mov.b @r4+, r8
negc r2, r1
mov.b r1, @r3
or r9, r7
mov.b @r4+, r6
add #(LCD_SC), r1
mov.b r1, @r3
add r7, r0
mov.b r0, @(2,r8)
add r8, r7
mov.b r7, @(r0,r4)
cmp/pz r6
mov.b @r4+, r0
mov.b @r4+, r8
negc r2, r1
mov.b r1, @r3
or r9, r6
mov.b @r4+, r7
add #(LCD_SC), r1
mov.b r1, @r3
add r6, r0
mov.b r0, @(4,r8)
add r8, r6
mov.b r6, @(r0,r4)
cmp/pz r7
mov.b @r4+, r0
mov.b @r4+, r8
negc r2, r1
mov.b r1, @r3
or r9, r7
mov.b @r4+, r6
add #(LCD_SC), r1
mov.b r1, @r3
add r7, r0
mov.b r0, @(6,r8)
add r8, r7
mov.b r7, @(r0,r4)
cmp/pz r6
mov.b @r4+, r0
mov.b @r4+, r8
negc r2, r1
mov.b r1, @r3
or r9, r6
mov.b @r4+, r7
add #(LCD_SC), r1
mov.b r1, @r3
add r6, r0
mov.b r0, @(8,r8)
add r8, r6
mov.b r6, @(r0,r4)
cmp/pz r7
mov.b @r4+, r0
mov.b @r4+, r8
negc r2, r1
mov.b r1, @r3
or r9, r7
mov.b @r4+, r6
add #(LCD_SC), r1
mov.b r1, @r3
add r7, r0
mov.b r0, @(10,r8)
add r8, r7
mov.b r7, @(r0,r4)
cmp/pz r6
mov.b @r4+, r0
mov.b @r4+, r8
negc r2, r1
mov.b r1, @r3
or r9, r6
mov.b @r4+, r7
add #(LCD_SC), r1
mov.b r1, @r3
add r6, r0
mov.b r0, @(12,r8)
add r8, r6
mov.b r6, @(r0,r4)
cmp/pz r7
mov.b @r4+, r0
mov.b @r4+, r8
negc r2, r1
mov.b r1, @r3
or r9, r7
mov.b @r4+, r6
add #(LCD_SC), r1
mov.b r1, @r3
add r7, r0
mov.b r0, @(14,r8)
add r8, r7
mov.b r7, @(r0,r4)
add #16, r8 /* advance current block address */
cmp/hi r4, r5 /* some blocks left? */
bt .greyloop
mov.l @r15+, r9 /* restore r9 */
mov #(LCD_CS|LCD_DS|LCD_SD|LCD_SC), r0
mov.l @r15+, r8 /* restore r8 */
mov.l @r15+, r9 /* restore r9 */
or r0, r1 /* restore port */
mov.l @r15+, r8 /* restore r8 */
rts
mov.b r1, @r3