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Csimbi
I post too much
 Reputation: 97
Joined: 14 Jul 2007
Posts: 3320
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 Posted: Mon Jan 27, 2025 3:30 pm Post subject: ASM - Extend float in XMM to 128 bits |
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Hi all,
this is what CE shows in the XMM register as float:
| Code: | | XMM0:0.00 _ 0.00 _ 0.02 _ 0.02 |
XMM0 contains 4 floats, as it were a 4D vector.
I would like to multiply each float with the same float value while not using movups to load 4 floats; I want to load just one float and extend it.
To move a float into XMM, we use movss.
E.g.
| Code: | | movss xmm1,[fMyVal] |
Is there an instruction to copy the float from the first 32 bits of XMM1 to the other 3 dwords of the XMM register so it would look like this:
| Code: | | XMM1:0.50 _ 0.50 _ 0.50 _ 0.50 |
Or, use something else instead of movss to get the same result, loading the same float into all 4 dwords at once?
In the end, I would like to use mulps xmm0,xmm1 to do the multiplication.
Thank you!
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Dark Byte
Site Admin
 Reputation: 470
Joined: 09 May 2003
Posts: 25778
Location: The netherlands
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| Posted: Mon Jan 27, 2025 3:47 pm Post subject: |
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i'm not 100% on this, but try
| Code: |
shufps xmm1, xmm1, 0x00
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to replicate the 0.50 to the other 3 spots
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ParkourPenguin
I post too much
 Reputation: 152
Joined: 06 Jul 2014
Posts: 4695
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| Posted: Mon Jan 27, 2025 4:06 pm Post subject: |
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If AVX is available, there's `vbroadcastss`
But if the game isn't using AVX (no `v` prefix on SSE instructions), stick with `movss` / `shufps` as DB said
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Csimbi
I post too much
Reputation: 97
Joined: 14 Jul 2007
Posts: 3320
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| Posted: Tue Jan 28, 2025 4:36 am Post subject: |
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| Dark Byte wrote: | i'm not 100% on this, but try
| Code: |
shufps xmm1, xmm1, 0x00
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to replicate the 0.50 to the other 3 spots |
Tested, this is 100% correct, thank you!
| ParkourPenguin wrote: | If AVX is available, there's `vbroadcastss`
But if the game isn't using AVX (no `v` prefix on SSE instructions), stick with `movss` / `shufps` as DB said |
No, there's no AVX, it's an older title.
Thank you though, I will take a mental note on this one.
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