To show current progress, the .section
.text.n_system.math.vectors$_$tvector3d_$__$$_$plus$tvector3d$tvector3d$$tvector3d,"ax"
routine ("class operator TVector3D.+(const aVector1, aVector2:
TVector3D): TVector3D;") on x86_64-win64 - before (this performs a
component-wise addition of two 4-component vectors... inputs are pointed
to by %rdx and %r8, and the result is pointed to by %rcx):
movss (%rdx),%xmm0
addss (%r8),%xmm0
movss %xmm0,(%rcx)
movss 4(%rdx),%xmm0
addss 4(%r8),%xmm0
movss %xmm0,4(%rcx)
movss 8(%rdx),%xmm0
addss 8(%r8),%xmm0
movss %xmm0,8(%rcx)
movss 12(%rdx),%xmm0
addss 12(%r8),%xmm0
movss %xmm0,12(%rcx)
ret
After:
movups (%rdx),%xmm0
addps (%r8),%xmm0
movups %xmm0,(%rcx)
ret
(Note that this unit is NOT suitable for 3D graphics because the
W-coordinate is treated the same as X, Y and Z rather than being kept at
1, say)
It's not perfect though. When vectorcall or the System V ABI is
concerned, it can produce worse code because of constantly needing to
break up the vector to manipulate individual components, and there may
be some unnecessary reads and writes between the stack and XMM
registers, but I'm working on it, bit by it.
My current branch can be found here:
https://gitlab.com/CuriousKit/optimisations/-/commits/ucomplex-x86-vector
Kit
On 23/08/2024 17:56, J. Gareth Moreton via fpc-devel wrote:
Hi everyone,
So I'm getting ready to showcase my current vector work to others. I
do have a question though...
Currently the feature is locked behind "-Sv", since this is
specificially "support vector processing" and the feature is still
experimental and inefficient in places, but is this the right
approach? I ask because the -S switches are specifically syntax
options, not code generation options (I do wonder exactly what syntax
it enables). Also, at least with the "make" script, it skips whole
program optimisation and some of the packages.
Should I use a compiler definition instead like "-dX86_VECTORS"? That
way, the feature can easily be turned off.
Kit
On 21/08/2024 15:59, J. Gareth Moreton via fpc-devel wrote:
Hi everyone,
Just thought I'd give a heads-up on what's happening with me and the
compiler improvements. Also, I've been busy with contract work and
have just had some minor surgery, so I'm not running on all cylinders
currently.
* Still waiting on administrator comments and feedback on my
assembly-level CSE feature (a couple of years old now) and the
first part of pure functions. Both of these should be ready to
merge unless someone found a bug that breaks things (someone did
find some examples with pure functions which have since been fixed).
* Haven't solved the SEH unwinding problem on aarch64-win64 yet.
This is quite a tough one!
* Also working on vectorisation for x86_64 platforms. I've got it
working on win64, and can vectorise two-operand commutative
operations like addition and multiplication, although some of the
generated code is less than optimal (unnecessarily copying
vectors to the stack). Linux (and other OSes that use the System
V ABI) is taking a bit longer since it stores pairs of floats in
single XMM registers even without vectorisation code, and some of
the internal procedures can't properly handle these if the desire
is to combine a pair of these such registers (so 4 singles) into
a single XMM vector, especially where shuffling is involved.
I'll let you know the progress.
Kit
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