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| 11:02.05 | m4D_ | hello. can anyone here tell me if xscale (armv5te-pxa272) actually does something, when i call 'pld' instruction? or is it just a stub? |
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| 11:26.30 | SpeedEvil | I'd hit up the datasheet. |
| 11:26.36 | SpeedEvil | Or programming manual. |
| 11:26.56 | SpeedEvil | I know intel used to make them - I don't remember who bought it from them |
| 11:39.37 | m4D_ | SpeedEvil: marvell did |
| 11:44.36 | SpeedEvil | ah - yes |
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| 20:07.30 | m4D_ | how to load word into wmm-register from unaligned ptr? the "intel wmmx developer guide" on p.32 says about dword, but i think 'walignr' not suitable for words |
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| 20:50.48 | roxfan | wow, people actually use wmmx? |
| 20:59.30 | m4D_ | looks like a cool thing to me. full vga screen fade (alpha-blending) at about ~30-35ms |
| 21:02.11 | roxfan | i think you can use walignr then just ignore/mask off the top word |
| 21:04.10 | m4D_ | look at how it operates with wRn:B3-B7. but data will be in B0-B3 (after i load it with wldrw) |
| 21:08.39 | roxfan | you need to use WLDRD to load 8 (aligned) bytes |
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| 21:12.39 | roxfan | hmm that example is buggy i think... line 3 should be BIC r0, r0, #7 |
| 21:16.19 | m4D_ | yeah |
| 21:17.51 | m4D_ | but do i need to load 2 near 64bit-blocks? looks to me, i only need to load one, and then shift it by 'and r1,r0, #3' - value |
| 21:18.17 | roxfan | yeah, that should work |
| 21:23.17 | m4D_ | well, it doesn't( i must be doing it wrong... http://pastebin.com/KEfB217j |
| 21:26.30 | roxfan | what's wsllwg? |
| 21:27.34 | m4D_ | logical shift left |
| 21:28.11 | m4D_ | umm, i guess we shouldn't multiply by 8... mov r6...mul r5... - wrong lines |
| 21:35.41 | roxfan | try this http://pastebin.com/TTJNBrpc |
| 21:36.20 | roxfan | you might need to mask off the top part of wR4, depending on what you need this data for |
| 21:36.47 | roxfan | why are you loading just a single word, anyway? |
| 21:37.07 | roxfan | the point of simd is to process several elements at once... |
| 21:42.01 | m4D_ | your code doesn't work. this case exists when blending image on non 8-byte boundary in framebuffer. i.e. when it's X-coordinate is 0 (or 8 for ex), it can load/store Dword, but when it's X=1 - we should read on byte-boundary |
| 21:43.05 | m4D_ | did you left wr1 empty intensionly? |
| 21:43.38 | roxfan | its contents shouldn't matter since you're only interested in the low word |
| 21:44.02 | roxfan | some of it might end up in top half of wr4 |
| 21:45.16 | m4D_ | i masked it out. still doesn't work |
| 21:47.03 | m4D_ | this code works half-way. http://pastebin.com/Bvz1Gyc5 on 8-byte boundary the image is ok, but on other - missing vertical stripes |
| 21:47.34 | roxfan | hrm |
| 21:47.36 | m4D_ | i think thats because of the way walignr works with operand wRn.. i guess i have to preshift it |
| 21:47.50 | roxfan | you're putting offset into wcgr2 but using walignr1 |
| 21:47.56 | roxfan | choose one or the other |
| 21:48.22 | m4D_ | oops,sorry |
| 21:48.26 | m4D_ | my bad, misprint |
| 21:48.34 | m4D_ | wcgr1 |
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