We didn't have a unit test for this and we weren't implementing it at
all.
We treated it as vmovhps/vmovhpd accidentally. Once again caught by the
libaom Intrinsics unit tests.
We can support a few combinations of guest and host vector sizes
Host: 128-bit or 256-bit
Guest: 128-bit or 256-bit
The typical case is Host = 128-bit and Guest = 256-bit now that AVX is
implemented.
On 32-bit this changes to Host=128-bit and Guest=128-bit because we
disable AVX.
In the vixl simulator 32-bit turns in to Host=256-bit and Guest=128-bit.
And then in the vixl sim 64-bit turns in to Host=256-bit and
Guest=256-bit.
We cover all four combinations of guest and host vector register sizes!
Fixes a few assumptions that SVE256 = AVX256 basically.
In regular SIB land the index register encoding of 0b100 encodes to "no
register", this feature lets you get SIB encodings without an index
register for flexibility.
In VSIB encoding this isn't expected behaviour and instead there are no
encodings where an index register is missing. Allowing you to encode all
sixteen registers as an index register.
This was causing an abort in `AVX128_LoadVSIB` because the index turned
in to an invalid register.
Working instruction:
`vgatherdps ymm2, dword [eax+ymm5*4], ymm7`
Broken instruction:
`vgatherdps ymm0, dword [eax+ymm4*4], ymm7`
This fixes a crash in libfmod where it is using gathers in the wild.
Fixing a crash in Ender Lilies.
When the source or destination is a register, the address size override
doesn't apply. We were accidentally applying it on all sources
regardless of type which was causing us to zero extend on operations
that aren't affected by address size override.
This fixes the OpenSSL cert error in every application, but most
importantly Steam.
During refactoring this was missed and rerunning unittests locally
caught it. 256-bit operations get their shift only from the lower half
of the vector register.
We can avoid a LOT of pointless work with some dedicated IR ops for specifically
overriding the round mode.
Small behaviour change here: we no longer reset FTZ. I think this is a bug fix?
But if it's not it's not hard to fix.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This does a gather load three ways, SVE256, SVE128, and ASIMD.
This operation is a bit special since it it can't quite handle all
gather loadstores in the 256-bit case and requires the frontend to
decompose the operation in the case that the striding hits a mode that
SVE doesn't support!
The 128-bit case is a lot simpler since both support all the cases where
stride doesn't match. I find this to be a nice compromise while there
aren't any SVE256 products on the market.
In the 128-bit case there is an SVE path which is utilized if the passed
in stride supports what SVE understands, otherwise it falls back to an
ASIMD implementation which manually emulates everything that is
necessary.
This instruction is very explicitly doing basically exactly what AVX
gather instructions want, because it's complex enough that we don't want
to try and make this a generic solution.
Ryan Houdek