forked from len0rd/rockbox
Sansa e200v2/Fuze: Optimize YUV blitting by writing 2 pixel at once to the DBOP and removing a few unneeded busy polling status register for fifo empty. Speed up between 50% and 80%.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24202 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz
parent
537bea5fac
commit
32b15fc08f
1 changed files with 51 additions and 52 deletions
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@ -51,14 +51,19 @@ lcd_write_yuv420_lines:
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@ r0 = yuv_src
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@ r1 = width
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@ r2 = stride
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stmfd sp!, { r4-r10, lr } @ save non-scratch
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stmfd sp!, { r4-r11, lr } @ save non-scratch
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mov r3, #0xC8000000 @
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orr r3, r3, #0x120000 @ r3 = DBOP_BASE
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ldmia r0, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p
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@ r5 = yuv_src[1] = Cb_p
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@ r6 = yuv_src[2] = Cr_p
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@ r0 = scratch
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sub r2, r2, #1 @
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mov r3, #0xC8000000 @
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orr r3, r3, #0x120000 @ r3 = DBOP_BASE
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ldr r12, [r3, #8] @
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sub r2, r2, #1 @ stride -= 1
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orr r12, r12, #3<<13 @
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str r12, [r3, #8] @ DBOP_CTRL |= (1<<13|1<<14) (32bit mode)
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10: @ loop line @
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ldrb r7, [r4], #1 @ r7 = *Y'_p++;
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ldrb r8, [r5], #1 @ r8 = *Cb_p++;
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@ -109,12 +114,7 @@ lcd_write_yuv420_lines:
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ldrb r12, [r4, r2] @ r12 = Y' = *(Y'_p + stride)
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@
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orr r0, r0, lr, lsl #11 @ r0 = (r << 11) | b
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orr r0, r0, r7, lsl #5 @ r0 = (r << 11) | (g << 5) | b
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strh r0, [r3, #0x10] @ write pixel
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1: @ busy @
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ldr r7, [r3,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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orr r11, r0, r7, lsl #5 @ r0 = (r << 11) | (g << 5) | b
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@
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sub r7, r12, #16 @ r7 = Y = (Y' - 16)*74
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add r12, r7, r7, asl #2 @
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@ -143,11 +143,8 @@ lcd_write_yuv420_lines:
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@
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orr r0, r0, lr, lsl #11 @ r0 = (r << 11) | b
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orr r0, r0, r7, lsl #5 @ r0 = (r << 11) | (g << 5) | b
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strh r0, [r3, #0x10] @ write pixel
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1: @ busy @
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ldr r7, [r3,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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orr r0, r11, r0, lsl#16 @ pack with 2nd pixel
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str r0, [r3, #0x10] @ write pixel
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@
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sub r7, r12, #16 @ r7 = Y = (Y' - 16)*74
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add r12, r7, r7, asl #2 @
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@ -176,12 +173,7 @@ lcd_write_yuv420_lines:
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@
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@
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orr r0, r0, lr, lsl #11 @ r0 = (r << 11) | b
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orr r0, r0, r7, lsl #5 @ r0 = (r << 11) | (g << 5) | b
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strh r0, [r3, #0x10] @ write pixel
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1: @ busy @
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ldr r7, [r3,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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orr r11, r0, r7, lsl #5 @ r0 = (r << 11) | (g << 5) | b
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@
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sub r7, r12, #16 @ r7 = Y = (Y' - 16)*74
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add r12, r7, r7, asl #2 @
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@ -208,16 +200,20 @@ lcd_write_yuv420_lines:
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@
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orr r0, r0, lr, lsl #11 @ r0 = (r << 11) | b
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orr r0, r0, r7, lsl #5 @ r0 = (r << 11) | (g << 5) | b
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strh r0, [r3, #0x10] @ write pixel
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1: @ busy @
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ldr r7, [r3,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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orr r0, r11, r0, lsl#16 @ pack with 2nd pixel
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str r0, [r3, #0x10] @ write pixel
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@
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subs r1, r1, #2 @ subtract block from width
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bgt 10b @ loop line @
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@
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ldmfd sp!, { r4-r10, pc } @ restore registers and return
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1: @ busy
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@ writing at max 110*32 its (LCD_WIDTH/2), the fifo is bigger
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@ so polling fifo empty after the loops is save
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ldr r7, [r3,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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ldmfd sp!, { r4-r11, pc } @ restore registers and return
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bx lr @
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.ltorg @ dump constant pool
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.size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines
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@ -263,13 +259,18 @@ lcd_write_yuv420_lines_odither:
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@ r5 = yuv_src[1] = Cb_p
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@ r6 = yuv_src[2] = Cr_p
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@
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sub r2, r2, #1 @
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ldr r14, [sp, #40] @ Line up pattern and kernel quadrant
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sub r2, r2, #1 @ stride =- 1
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eor r14, r14, r3 @
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and r14, r14, #0x2 @
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mov r14, r14, lsl #6 @ 0x00 or 0x80
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mov r3, #0xC8000000 @
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orr r3, r3, #0x120000 @ r3 = DBOP_BASE
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orr r3, r3, #0x120000 @ r3 = DBOP_BASE, need to be redone
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@ due to lack of registers
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ldr r12, [r3, #8] @
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orr r12, r12, #3<<13 @ DBOP_CTRL |= (1<<13|1<<14)
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str r12, [r3, #8] @ (32bit mode)
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10: @ loop line @
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@
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ldrb r7, [r4], #1 @ r7 = *Y'_p++;
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@ -339,13 +340,8 @@ lcd_write_yuv420_lines_odither:
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and r11, r11, #0xf800 @ pack pixel
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and r7, r7, #0x7e00 @ r0 = pixel = (r & 0xf800) |
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orr r11, r11, r7, lsr #4 @ ((g & 0x7e00) >> 4) |
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orr r0, r11, r0, lsr #10 @ (b >> 10)
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strh r0, [r3, #0x10] @ write pixel
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1: @ busy @
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ldr r7, [r3,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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@
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orr r3, r11, r0, lsr #10 @ (b >> 10)
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@ save pixel
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sub r7, r12, #16 @ r7 = Y = (Y' - 16)*149
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add r12, r7, r7, asl #2 @
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add r12, r12, r12, asl #4 @
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@ -389,11 +385,11 @@ lcd_write_yuv420_lines_odither:
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and r7, r7, #0x7e00 @ r0 = pixel = (r & 0xf800) |
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orr r11, r11, r7, lsr #4 @ ((g & 0x7e00) >> 4) |
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orr r0, r11, r0, lsr #10 @ (b >> 10)
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strh r0, [r3, #0x10] @ write pixel
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1: @ busy @
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ldr r7, [r3,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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orr r3, r3, r0, lsl#16 @ pack with 2nd pixel
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mov r0, #0xC8000000 @
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orr r0, r0, #0x120000 @ r3 = DBOP_BASE
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str r3, [r0, #0x10] @ write pixel
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@
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sub r7, r12, #16 @ r7 = Y = (Y' - 16)*149
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add r12, r7, r7, asl #2 @
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@ -439,12 +435,8 @@ lcd_write_yuv420_lines_odither:
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and r11, r11, #0xf800 @ pack pixel
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and r7, r7, #0x7e00 @ r0 = pixel = (r & 0xf800) |
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orr r11, r11, r7, lsr #4 @ ((g & 0x7e00) >> 4) |
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orr r0, r11, r0, lsr #10 @ (b >> 10)
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strh r0, [r3, #0x10] @ write pixel
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1: @ busy @
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ldr r7, [r3,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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orr r3, r11, r0, lsr #10 @ (b >> 10)
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@ save pixel
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@
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sub r7, r12, #16 @ r7 = Y = (Y' - 16)*149
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add r12, r7, r7, asl #2 @
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@ -487,15 +479,22 @@ lcd_write_yuv420_lines_odither:
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and r7, r7, #0x7e00 @ r0 = pixel = (r & 0xf800) |
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orr r11, r11, r7, lsr #4 @ ((g & 0x7e00) >> 4) |
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orr r0, r11, r0, lsr #10 @ (b >> 10)
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strh r0, [r3, #0x10] @ write pixel
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1: @ busy @
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ldr r7, [r3,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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orr r3, r3, r0, lsl#16 @ pack with 2nd pixel
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mov r0, #0xC8000000 @
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orr r0, r0, #0x120000 @ r3 = DBOP_BASE
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str r3, [r0, #0x10] @ write pixel
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@
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subs r1, r1, #2 @ subtract block from width
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bgt 10b @ loop line @
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@
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1: @ busy @
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@ writing at max 110*32 its (LCD_WIDTH/2), the fifo is bigger
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@ so polling fifo empty after the loops is save
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ldr r7, [r0,#0xc] @ r7 = DBOP_STATUS
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tst r7, #DBOP_BUSY @ fifo not empty?
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beq 1b @
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ldmfd sp!, { r4-r11, pc } @ restore registers and return
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.ltorg @ dump constant pool
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.size lcd_write_yuv420_lines_odither, .-lcd_write_yuv420_lines_odither
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