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N
naukkis
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N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
I haven't named them. Vector cpu load vectors either from continuous memory location or non-continuous indexed memory. After that costly...
Yesterday at 2:01 PM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
Not everything is worth vectorization but vector ISA does about everything to get most of vectorization. Vector cpus do data reordering...
Yesterday at 12:35 PM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
RVV is vector ISA not SIMD. You are talking about SIMD arch, vector ISA is totally different. Vector ISA vectors aren't fixed size but...
Yesterday at 10:42 AM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
The complex addressing mode the worse performing it usually is. If compiler does some optimization like loop unrolling it pretty much...
Sunday at 8:58 AM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
Let's see what Intel optimization guide has to say: "The micro-op queue decouples the front end and the out-of order engine. It stays...
Sunday at 2:15 AM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
There isn't such a limitations involved. What that immediate size will make is that data localisation is effectively used. If code...
Saturday at 10:10 AM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
Those general code optimization rules will stay as long as hardware is page-based. Optimal data access patterns are full pages as those...
Saturday at 9:11 AM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
Fastpath only needs to calculate lower address. Whether if ISA supports longer immediates or don't well written code is optimized to...
Saturday at 8:28 AM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
That's near pointer from cpu hardware point, operating in 4KB range. RV design is very well done, there's not much which could be done...
Saturday at 8:15 AM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
Yeah, those simple predictable addressing modes can be handled pretty much with fixed function logic. But hardware needs massive...
Saturday at 7:00 AM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
Every high performance designs is heading to thousand instruction window and over.
Saturday at 6:55 AM
N
naukkis
replied to the thread
Question
Are scalable vectors the ultimate solution to fixed width SIMD?
.
Vector ISA like RV or those 70-80's Crays express vectors as loops of scalar instructions. Vectors can be any length, with RV there's...
Saturday at 6:48 AM
N
naukkis
replied to the thread
Discussion
Qualcomm Snapdragon Thread
.
It doesn't. But it has to split if code wants to create addresses few thousands instructions before actual load. No. Risc-V doesn't...
Saturday at 6:38 AM
N
naukkis
replied to the thread
Discussion
Qualcomm Snapdragon Thread
.
RISV-C is about keeping instructions as independent as possible. Indexed addressing modes and pre/post incrementing addresses combine...
Saturday at 2:16 AM
N
naukkis
replied to the thread
Discussion
Intel Meteor, Arrow, Lunar & Panther Lakes Discussion Threads
.
See that there isn't any extreme performance-oriented SMT-less design out yet. Intel seems to be first - if have to bet I would say...
Jun 25, 2024
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