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[main] Combine SME slice parameters #225

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Previously the (alpha) SME intrinsics were documented to take two slice parameters: a 32-bit variable index and a 64-bit constant offset. However, it isn't very C-like to split an addition in this way, and as Sander points out, it isn't really consistent with the way that we handle vnum parameters.


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Thanks for suggesting this change Richard, I think this makes the intrinsics a little more intuitive and I'm pretty confident that compilers can do a good enough job to separate the immediate from the tile slice.

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Previously the (alpha) SME intrinsics were documented to take two
slice parameters: a 32-bit variable index and a 64-bit constant
offset.  However, it isn't very C-like to split an addition in
this way, and as Sander points out, it isn't really consistent
with the way that we handle vnum parameters.

The patch also removes a specific reference to w12-w15, since
some SME2 instructions use w8-w11.
@rsandifo-arm rsandifo-arm merged commit 6410c04 into ARM-software:main Aug 17, 2023
3 checks passed
@rsandifo-arm rsandifo-arm deleted the sme-merge-slice-arguments branch August 17, 2023 08:51
CarolineConcatto pushed a commit to CarolineConcatto/acle that referenced this pull request Dec 6, 2023
Previously the (alpha) SME intrinsics were documented to take two
slice parameters: a 32-bit variable index and a 64-bit constant
offset.  However, it isn't very C-like to split an addition in
this way, and as Sander points out, it isn't really consistent
with the way that we handle vnum parameters.

The patch also removes a specific reference to w12-w15, since
some SME2 instructions use w8-w11.

* Some SME instructions identify a slice of ZA using the sum of a 32-bit
general-purpose register and an immediate offset. The intrinsics for
these instructions have a 32-bit argument called `slice`, which is
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To be consistent, change "called" to "named" - as you did in the opening paragraph


* If the intrinsic also has a `vnum` argument, the ZA slice number
is calculated by adding `vnum` to `slice`. Both `slice` and `vnum`
can both be variable.
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can both be variable -> can be variable.

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few comments

@rsandifo-arm
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few comments

Thanks, I created #312 to address the comments.

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5 participants