Displaying 6 results from an estimated 6 matches for "ptr_i".
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2008 May 20
2
[LLVMdev] Making use of SSE intrinsics
Hi all,
I'd like to make use of some specific x86 Streaming SIMD Extension
instructions, but I don't know where to start. For instance the 'rcpps'
instructions computes a low precision but fast reciprocal. I've noticed that
LLVM supports intrinsics, but I couldn't find any information on how to use
them. I've tried digging through the LLVM-GCC code but it's just
2008 May 20
0
[LLVMdev] Making use of SSE intrinsics
On Tue, May 20, 2008 at 5:03 AM, Nicolas Capens <nicolas at capens.net> wrote:
> LoadInst *x = new LoadInst(ptr_x, "", false, basicBlock);
>
> // y = rcpps(x) // FIXME
> StoreInst *storeResult = new StoreInst(y, ptr_y, false, basicBlock);
Using an IRBuilder, something like the following (uncompiled, but it's
at least approximately right):
Value* x =
2008 May 08
0
[LLVMdev] Vector code
Hi Matthijs,
Yes, I've turned off the link-time optimizations (otherwise it just
propagates my constant vectors and immediate prints the result). :-)
Here's essentially what I try to generate:
void add(float z[4], float x[4], float y[4])
{
z[0] = x[0] + y[0];
z[1] = x[1] + y[1];
z[2] = x[2] + y[2];
z[3] = x[3] + y[3];
}
And here's part of the output from the online
2008 May 08
2
[LLVMdev] Vector code
llvm does not automatically vectorize your scalar code (as least for
now). You have to write gcc generic vector code or use vector builtins.
Evan
On May 8, 2008, at 1:46 PM, Nicolas Capens wrote:
> Hi Matthijs,
>
> Yes, I've turned off the link-time optimizations (otherwise it just
> propagates my constant vectors and immediate prints the result). :-)
>
> Here's
2008 May 08
3
[LLVMdev] Vector code
Hi Nicolas (at least, I suspect your signing of your mail with "Anton" was not
intentional :-p),
> I assume that's the same as the online demo's "Show LLVM C++ API code"
> option (http://llvm.org/demo/)? I've tried that with a structure containing
> four floating-point components but it also appears to add them individually
> using extract/insert. Maybe
2008 May 09
0
[LLVMdev] Vector code
Hi Evan,
Please note that I'm not trying to compile from C code, I try to generate
functions at run-time directly. I want to keep it target-independent too, so
I can't use intrinsics either.
Cheers,
-Nicolas
-----Original Message-----
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of Evan Cheng
Sent: Thursday, 08 May, 2008 23:31
To: LLVM