https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127100
--- Comment #6 from Stefan Schulze Frielinghaus <stefansf at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #2) > The emitted instructions used to be > vll %v2,%r1,164(%r15) > I can't find documentation for it, but the %r1 in there is the value of the > 4th .LEN_LOAD operand and clearly the instruction loads %r1+1 bytes [...] Right, instruction VECTOR LOAD WITH LENGTH (vll) loads as you said %r1+1 bytes. It is a bit cryptic to read from the Principles of Operations which reads that up to the byte index specified by %r1 is read which basically means %r1+1 bytes are read. The version targeting z17 can be found here: https://www.ibm.com/docs/en/module_1678991624569/pdf/SA22-7832-14.pdf (In reply to Robin Dapp from comment #5) [...] > I can take it but won't get to it very soon. If somebody else wants to, > feel free. > > The whole len area is messy/inconsistent and something I wanted to clean up > this year but haven't found time yet... I haven't wrapped my head around this. Let me finish some patches and I will also give it a try.
