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Cut a few instructions from lcd_copy_buffer_rect.

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Change-Id: I5159534f90b041c6ffefc00c8f91abc68ca6eb42
This commit is contained in:
Michael Sevakis 2012-01-14 16:16:05 -05:00
parent bb24ac8c27
commit cc26850135
1 changed files with 13 additions and 17 deletions
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30
firmware/target/arm/lcd-as-memframe.S
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@ -51,46 +51,42 @@ lcd_copy_buffer_rect: @
ble 40f @ finish line @ next line if lt or finish
@ trailing halfword if eq
20: @ rem copy @
add r14, r2, #1 @ get remaining width mod 16 after word
sub r14, r2, #1 @ wrap remaining width mod 16 after word
@ align (rw)
and r14, r14, #0xe @ r14 = 0 (16), 2, 4, 6, 8, 10, 12, 14
and r14, r14, #0xe @ r14 = 14, 0, 2, 4, 6, 8, 10, 12
add pc, pc, r14, lsl #3 @ branch to 32-byte align
nop @
b 30f @ rw % 16 = 0 or 1? use octword loop
nop @
nop @
nop @
ldr r6, [r1], #4 @ rw % 16 = 2 or 3
ldr r6, [r1], #4 @ rw % 16 = 2 or 3 (0)
subs r2, r2, #2 @
str r6, [r0], #4 @
b 25f @ copy up done @
ldmia r1!, { r6-r7 } @ rw % 16 = 4 or 5
ldmia r1!, { r6-r7 } @ rw % 16 = 4 or 5 (2)
subs r2, r2, #4 @
stmia r0!, { r6-r7 } @
b 25f @ copy up done @
ldmia r1!, { r6-r8 } @ rw % 16 = 6 or 7
ldmia r1!, { r6-r8 } @ rw % 16 = 6 or 7 (4)
subs r2, r2, #6 @
stmia r0!, { r6-r8 } @
b 25f @ copy up done @
ldmia r1!, { r6-r9 } @ rw % 16 = 8 or 9
ldmia r1!, { r6-r9 } @ rw % 16 = 8 or 9 (6)
subs r2, r2, #8 @
stmia r0!, { r6-r9 } @
b 25f @ copy up done @
ldmia r1!, { r6-r10 } @ rw % 16 = 10 or 11
ldmia r1!, { r6-r10 } @ rw % 16 = 10 or 11 (8)
subs r2, r2, #10 @
stmia r0!, { r6-r10 } @
b 25f @ copy up done @
ldmia r1!, { r6-r11 } @ rw % 16 = 12 or 13
ldmia r1!, { r6-r11 } @ rw % 16 = 12 or 13 (10)
subs r2, r2, #12 @
stmia r0!, { r6-r11 } @
b 25f @ copy up done @
ldmia r1!, { r6-r12 } @ rw % 16 = 14 or 15
ldmia r1!, { r6-r12 } @ rw % 16 = 14 or 15 (12)
subs r2, r2, #14 @
stmia r0!, { r6-r12 } @
25: @ copy up done @
ble 40f @ finish line @ no 32-byte segments remaining?
30: @ octword loop @ copy 16 pixels per loop
ldmia r1!, { r6-r12, r14 } @
ble 40f @ finish line @
30: @ octword loop @ rw % 16 = 0 or 1 (14)
ldmia r1!, { r6-r12, r14 } @ copy 16 pixels per loop
subs r2, r2, #16 @
stmia r0!, { r6-r12, r14 } @
bgt 30b @ octword loop @
@ -102,9 +98,9 @@ lcd_copy_buffer_rect: @
subs r3, r3, #1 @ next line
bgt 10b @ copy line @
ldmpc regs=r4-r11 @ restore regs and return
.ltorg @ dump constant pool
.size lcd_copy_buffer_rect, .-lcd_copy_buffer_rect
/****************************************************************************
* void lcd_write_yuv420_lines(fb_data *dst,
* unsigned char const * const src[3],