Displaying 7 results from an estimated 7 matches for "__builtin_nontemporal_load".
2018 Jan 20
2
Non-Temporal hints from Loop Vectorizer
...!1
>
> so that i can offload load, add, store to accelerator hardware. is it
> possible here? do i need a separate pass to detect whether the loop has non
> temporal data or polly will help here? what do you say?
>
> From C/C++ you just need to use the __builtin_nontemporal_store/__builtin_nontemporal_load
> builtins to tag the stores/loads with the nontemporal flag.
>
> for(i=0;i<2048;i++) {
> __builtin_nontemporal_store( __builtin_nontemporal_load(b+i) +
> __builtin_nontemporal_load(c + i), a + i );
> }
>
> There may be an attribute you can tag pointers with instead but...
2018 Jan 20
0
Non-Temporal hints from Loop Vectorizer
...mporal !1
>
> so that i can offload load, add, store to accelerator hardware. is it
> possible here? do i need a separate pass to detect whether the loop
> has non temporal data or polly will help here? what do you say?
From C/C++ you just need to use the
__builtin_nontemporal_store/__builtin_nontemporal_load builtins to tag
the stores/loads with the nontemporal flag.
for(i=0;i<2048;i++) {
__builtin_nontemporal_store( __builtin_nontemporal_load(b+i) +
__builtin_nontemporal_load(c + i), a + i );
}
There may be an attribute you can tag pointers with instead but I don't
know off hand.
>...
2018 Jan 21
0
Non-Temporal hints from Loop Vectorizer
...oad, add, store to accelerator hardware.
>> is it possible here? do i need a separate pass to detect whether
>> the loop has non temporal data or polly will help here? what do
>> you say?
> From C/C++ you just need to use the
> __builtin_nontemporal_store/__builtin_nontemporal_load builtins to
> tag the stores/loads with the nontemporal flag.
>
> for(i=0;i<2048;i++) {
> __builtin_nontemporal_store( __builtin_nontemporal_load(b+i) +
> __builtin_nontemporal_load(c + i), a + i );
> }
>
> There may be an attribute you can tag p...
2018 Jan 20
2
Non-Temporal hints from Loop Vectorizer
Actually i am working on vector accelerator which will perform those
instructions which are non temporal.
for instance if i have this loop
for(i=0;i<2048;i++)
a[i]=b[i]+c[i];
currently it emits following IR;
%0 = getelementptr inbounds [2048 x i32], [2048 x i32]* @b, i64 0, i64
%index
%1 = bitcast i32* %0 to <16 x i32>*
%wide.load = load <16 x i32>, <16 x i32>* %1,
2016 Jan 14
2
RFC: non-temporal fencing in LLVM IR
Hi JF, Philip,
Clang currently has __builtin_nontemporal_store and __builtin_nontemporal_load. How will the usage model for those change?
Thanks again,
Hal
----- Original Message -----
> From: "Philip Reames via llvm-dev" <llvm-dev at lists.llvm.org>
> To: "JF Bastien" <jfb at google.com>, "llvm-dev"
> <llvm-dev at lists.llvm.org>...
2016 May 03
6
[RFC] Non-Temporal hints from Loop Vectorizer
Hello all,
I've been wondering why Clang doesn't generate non-temporal stores when
compiling the STREAM benchmark [1] and therefore doesn't yield optimal
results.
It turned out that the Loop Vectorizer correctly vectorizes the arithmetic
operations and also merges the loads and stores into vector operations.
However it doesn't add the '!nontemporal' metadata which would
2016 Jan 13
4
RFC: non-temporal fencing in LLVM IR
Hello, fencing enthusiasts!
*TL;DR:* We'd like to propose an addition to the LLVM memory model
requiring non-temporal accesses be surrounded by non-temporal load barriers
and non-temporal store barriers, and we'd like to add such orderings to the
fence IR opcode.
We are open to different approaches, hence this email instead of a patch.
*Who's "we"?*
Philip Reames brought