Please disregard, I looked harder. I’ll look into this. > On Sep 20, 2018, at 12:13 AM, Pete Brubaker <[email protected]> wrote: > > I think you made a copy paste snafu there Scott. The second code block > doesn’t contain a foreach statement and looks very similar to the first block. > > Cheers, > > Pete > >> On Sep 19, 2018, at 11:23 PM, Scott Pakin <[email protected]> wrote: >> >> I'm using ISPC to optimize some code written by a colleague. Here's a >> snippet of ISPC code that works correctly: >> >> extern uniform int64 N, nnodes; >> extern uniform float *uniform c; >> >> export void SWAP_helper (uniform int64 qubit1, uniform int64 qubit2) { >> for (uniform int64 qbase = 0; qbase < N/nnodes; qbase += programCount) { >> int64 q = qbase + programIndex; >> int64 x = q; >> int64 b1 = (x>>qubit1)&1ll; >> int64 b2 = (x>>qubit2)&1ll; >> cif (b1 != b2) { >> int64 y = (x^(1ll<<qubit1))^(1ll<<qubit2); >> cif (y > x) { >> float aux[2]; >> aux[0] = c[2*x + 0]; >> aux[1] = c[2*x + 1]; >> c[2*x + 0] = c[2*y + 0]; >> c[2*x + 1] = c[2*y + 1]; >> c[2*y + 0] = aux[0]; >> c[2*y + 1] = aux[1]; >> } >> } >> } >> } >> >> >> I then put the swap operation in a foreach loop: >> >> extern uniform int64 N, nnodes; >> extern uniform float *uniform c; >> >> export void SWAP_helper (uniform int64 qubit1, uniform int64 qubit2) { >> for (uniform int64 qbase = 0; qbase < N/nnodes; qbase += programCount) { >> int64 q = qbase + programIndex; >> int64 x = q; >> int64 b1 = (x>>qubit1)&1ll; >> int64 b2 = (x>>qubit2)&1ll; >> cif (b1 != b2) { >> int64 y = (x^(1ll<<qubit1))^(1ll<<qubit2); >> cif (y > x) { >> float aux[2]; >> foreach (i = 0 ... 2) { >> aux[i] = c[2*x + i]; >> c[2*x + i] = c[2*y + i]; >> c[2*y + i] = aux[i]; >> } >> } >> } >> } >> } >> >> >> To my surprise, the program then failed its verification checks. Am I doing >> something stupid, or is there something about foreach I'm misunderstanding? >> >> Thanks, >> — Scott >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Intel SPMD Program Compiler Users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout.
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