may be other can check out if my suspiciion is correct. The arrays are
global arrays. By pre-emption rule, they are pre-emptible, meaning
their value can be changed by dependent libraries (shared libraries).
If you use "static" or "local", things should work fine. If my claim
is correct, this is an ABI issue, not compiler optimization issue
Sun
On Fri, Jan 18, 2013 at 8:51 AM, Huan Luo <luo_huan...@126.com> wrote:
> Hi,
> There seems to be a problem. Open64 cannot vectorize the loop...
> $ opencc -O3 -msse2 -ffast-math -LNO:simd=2 -LNO:simd_verbose=ON fun.c
> And the output is:
> (fun.c:6) Expression rooted at op "OPC_I4MPY"(line 7) is not vectorizable.
> Loop was not vectorized.
> I don't see why it cannot vectorize such a simple loop.
>
> fun.c
>
> ==========================
> int i, j;
> int a[1024], b[1024], c[1024];
>
> main()
> {
> for (i=0; i<1024; i++) {
>
> a[i]=a[i]+b[i]*c[i];
> }
> }
> ==========================
>
>
>
>
> --
> Best wishes.
>
> Huan Luo
>
>
> 在 2013-01-17 17:07:13，"Das, Dibyendu" <dibyendu....@amd.com> 写道：
>
> Try –LNO:simd_verbose=ON
>
>
>
> From: Huan Luo [mailto:luo_huan...@126.com]
> Sent: Thursday, January 17, 2013 2:31 PM
> To: Das, Dibyendu
> Subject: Re:RE: [Open64-devel] How to dump the ir tree after vectorization?
>
>
>
> Thank you very much. That works.
> And any idea on how to dump the internal structure after vectorization?
>
> --
>
> Best wishes.
>
> Huan Luo
>
>
>
>
> 在 2013-01-17 16:45:58，"Das, Dibyendu" <dibyendu....@amd.com> 写道：
>
> At –O3 and above you should be able to use –LNO:simd=1,2,3 for
> vectorization.
>
> -dibyendu
>
>
>
> From: Huan Luo [mailto:luo_huan...@126.com]
> Sent: Thursday, January 17, 2013 12:56 PM
> To: open64 mailing list
> Subject: [Open64-devel] How to dump the ir tree after vectorization?
>
>
>
> Hi,
> Lately we've been trying to use open64 to vectorize our
> program and dump the tree for later analysis. But we are not
> sure which option is available. Could anybody tell us?
> A similar purpose can be achieved by gcc. For example:
> fun.c
> ===========================================
> int i, j;
> int a[1024], b[1024], c[1024];
>
> main()
> {
> for (i=0; i<100; i++) {
> a[i]=a[i]+b[i]*c[i];
> }
> }
> ============================================
> We use the option -ftree-vectorize to apply vectorization, and
> -fdump-tree-uncprop to dump the functions after vectorization.
> the command is:
> gcc -O -dA -msse2 -ffast-math -ftree-vectorize -fdump-tree-uncprop fun.c
> and the file looks like this:
> fun.c.136t.uncprop
> ============================================
>
> ;; Function main (main) (executed once)
>
> main ()
> {
> long unsigned int ivtmp.30;
> vector(4) int vect_var_.21;
> vector(4) int vect_var_.20;
> vector(4) int vect_var_.19;
> vector(4) int vect_var_.14;
> vector(4) int vect_var_.9;
>
> <bb 2>:
>
> <bb 3>:
> # ivtmp.30_15 = PHI <ivtmp.30_7(3), 0(2)>
> vect_var_.9_18 = MEM[symbol: a, index: ivtmp.30_15, offset: 0B];
> vect_var_.14_22 = MEM[symbol: b, index: ivtmp.30_15, offset: 0B];
> vect_var_.19_26 = MEM[symbol: c, index: ivtmp.30_15, offset: 0B];
> vect_var_.20_27 = vect_var_.14_22 * vect_var_.19_26;
> vect_var_.21_28 = vect_var_.9_18 + vect_var_.20_27;
> MEM[symbol: a, index: ivtmp.30_15, offset: 0B] = vect_var_.21_28;
> ivtmp.30_7 = ivtmp.30_15 + 16;
> if (ivtmp.30_7 != 400)
> goto <bb 3>;
> else
> goto <bb 4>;
>
> <bb 4>:
> i = 100;
> return;
>
> }
> ============================================
> However, gcc is not enough for analysis. So I wonder if there is a way to do
> it in open64
> and maybe it will provide more convenience than gcc.
> Your help would be greatly appreciated.
>
> --
>
> Best wishes.
>
> Huan Luo
>
>
>
>
>
>
>
>
>
>
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