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Speedup of iPod nano 2G YUV blitting by 3%.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28825 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann
parent
298bbe8d3c
commit
abf28a9586
1 changed files with 35 additions and 37 deletions
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@ -100,7 +100,7 @@ lcd_write_yuv420_lines:
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mov r7, r2 /* r7 = loop count */
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add r8, sp, #16 /* chroma buffer */
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mov lr, r1 /* LCD data port = LCD_BASE */
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add lr, r1, #0x40 /* LCD data port = LCD_BASE + 0x40 */
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/* 1st loop start */
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10: /* loop start */
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@ -153,21 +153,21 @@ lcd_write_yuv420_lines:
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andhi r4, r4, #31
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15: /* no clamp */
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/* calculate pixel_1 and save to r5 for later pixel packing */
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/* calculate pixel_1 and save to r4 for later pixel packing */
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orr r4, r4, r3, lsl #5 /* pixel_1 = r<<11 | g<<5 | b */
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orr r5, r4, r6, lsl #11 /* r5 = pixel_1 */
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orr r4, r4, r6, lsl #11 /* r4 = pixel_1 */
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/* 1st loop, second pixel */
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ldrb r4, [r9], #1 /* r4 = *ysrc++ = *Y'_p++ */
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sub r4, r4, #16 /* r4 = (Y'-16) * 74 */
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add r3, r4, r4, asl #2
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add r4, r3, r4, asl #5
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ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
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sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
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add r3, r5, r5, asl #2
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add r5, r3, r5, asl #5
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add r6, r1, r4, asr #8 /* r6 = r = (Y >> 9) + rv */
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add r3, r2, r4, asr #7 /* r3 = g = (Y >> 8) + guv */
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add r4, r0, r4, asr #8 /* r4 = b = (Y >> 9) + bu */
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add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
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add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
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add r5, r0, r5, asr #8 /* r5 = b = (Y >> 9) + bu */
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orr r0, r6, r4 /* check if clamping is needed... */
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orr r0, r6, r5 /* check if clamping is needed... */
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orr r0, r0, r3, asr #1 /* ...at all */
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cmp r0, #31
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bls 15f /* -> no clamp */
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@ -177,23 +177,22 @@ lcd_write_yuv420_lines:
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cmp r3, #63 /* clamp g */
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mvnhi r3, r3, asr #31
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andhi r3, r3, #63
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cmp r4, #31 /* clamp b */
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mvnhi r4, r4, asr #31
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andhi r4, r4, #31
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cmp r5, #31 /* clamp b */
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mvnhi r5, r5, asr #31
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andhi r5, r5, #31
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15: /* no clamp */
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/* calculate pixel_2 and pack with pixel_1 before writing */
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orr r4, r4, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
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orr r4, r4, r6, lsl #11 /* r4 = pixel_2 */
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orr r5, r5, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
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orr r5, r5, r6, lsl #11 /* r5 = pixel_2 */
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/* wait for FIFO half full */
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.fifo_wait1:
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ldr r3, [lr, #0x1C] /* while (LCD_STATUS & 0x08); */
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ldr r3, [lr, #-0x24] /* while (LCD_STATUS & 0x08); */
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tst r3, #0x8
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bgt .fifo_wait1
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str r5, [lr, #0x40] /* write pixel_1 */
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str r4, [lr, #0x40] /* write pixel_2 */
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stmia lr, {r4,r5} /* write pixel_1 and pixel_2 */
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subs r7, r7, #2 /* check for loop end */
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bgt 10b /* back to beginning */
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@ -234,21 +233,21 @@ lcd_write_yuv420_lines:
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mvnhi r4, r4, asr #31
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andhi r4, r4, #31
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15: /* no clamp */
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/* calculate pixel_1 and save to r5 for later pixel packing */
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/* calculate pixel_1 and save to r4 for later pixel packing */
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orr r4, r4, r3, lsl #5 /* pixel_1 = r<<11 | g<<5 | b */
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orr r5, r4, r6, lsl #11 /* r5 = pixel_1 */
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orr r4, r4, r6, lsl #11 /* r4 = pixel_1 */
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/* 2nd loop, second pixel */
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ldrb r4, [r9], #1 /* r4 = *ysrc++ = *Y'_p++ */
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sub r4, r4, #16 /* r4 = (Y'-16) * 74 */
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add r3, r4, r4, asl #2
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add r4, r3, r4, asl #5
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ldrb r5, [r9], #1 /* r5 = *ysrc++ = *Y'_p++ */
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sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
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add r3, r5, r5, asl #2
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add r5, r3, r5, asl #5
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add r6, r1, r4, asr #8 /* r6 = r = (Y >> 9) + rv */
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add r3, r2, r4, asr #7 /* r3 = g = (Y >> 8) + guv */
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add r4, r0, r4, asr #8 /* r4 = b = (Y >> 9) + bu */
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add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
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add r3, r2, r5, asr #7 /* r3 = g = (Y >> 8) + guv */
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add r5, r0, r5, asr #8 /* r5 = b = (Y >> 9) + bu */
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orr r0, r6, r4 /* check if clamping is needed... */
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orr r0, r6, r5 /* check if clamping is needed... */
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orr r0, r0, r3, asr #1 /* ...at all */
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cmp r0, #31
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bls 15f /* -> no clamp */
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@ -258,23 +257,22 @@ lcd_write_yuv420_lines:
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cmp r3, #63 /* clamp g */
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mvnhi r3, r3, asr #31
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andhi r3, r3, #63
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cmp r4, #31 /* clamp b */
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mvnhi r4, r4, asr #31
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andhi r4, r4, #31
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cmp r5, #31 /* clamp b */
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mvnhi r5, r5, asr #31
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andhi r5, r5, #31
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15: /* no clamp */
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/* calculate pixel_2 and pack with pixel_1 before writing */
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orr r4, r4, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
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orr r4, r4, r6, lsl #11 /* r4 = pixel_2 */
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orr r5, r5, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
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orr r5, r5, r6, lsl #11 /* r5 = pixel_2 */
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/* wait for FIFO half full */
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.fifo_wait2:
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ldr r3, [lr, #0x1C] /* while (LCD_STATUS & 0x08); */
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ldr r3, [lr, #-0x24] /* while (LCD_STATUS & 0x08); */
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tst r3, #0x8
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bgt .fifo_wait2
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str r5, [lr, #0x40] /* write pixel_1 */
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str r4, [lr, #0x40] /* write pixel_2 */
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stmia lr, {r4,r5} /* write pixel_1 and pixel_2 */
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subs r7, r7, #2 /* check for loop end */
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bgt 20b /* back to beginning */
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