diff options
Diffstat (limited to 'src/gpgpu-sim/dram.cc')
| -rw-r--r-- | src/gpgpu-sim/dram.cc | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/gpgpu-sim/dram.cc b/src/gpgpu-sim/dram.cc index 02356b2..6f3155f 100644 --- a/src/gpgpu-sim/dram.cc +++ b/src/gpgpu-sim/dram.cc @@ -207,8 +207,31 @@ dram_req_t::dram_req_t(class mem_fetch *mf, unsigned banks, } case BITWISE_XORING_BK_INDEX: { // xoring bank bits with lower bits of the page - int lbank = log2(banks); + int lbank = LOGB2(banks); bk = tlx.bk ^ (tlx.row & ((1 << lbank) - 1)); + break; + } + case IPOLY_BK_INDEX: + { + /*IPOLY for bank indexing function from "Pseudo-randomly interleaved memory." + * Rau, B. R et al. + * ISCA 1991 + * http://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=348DEA37A3E440473B3C075EAABC63B6?doi=10.1.1.12.7149&rep=rep1&type=pdf + */ + if (banks == 16) { + std::bitset<64> a(tlx.row); + std::bitset<4> b(tlx.bk); + b[0] = a[11]^a[10]^a[9]^a[8]^a[6]^a[4]^a[3]^a[0]^b[0]; + b[1] = a[12]^a[8]^a[7]^a[6]^a[5]^a[3]^a[1]^a[0]^b[1]; + b[2] = a[9]^a[8]^a[7]^a[6]^a[4]^a[2]^a[1]^b[2]; + b[3] = a[10]^a[9]^a[8]^a[7]^a[5]^a[3]^a[2]^b[3]; + bk = b.to_ulong(); + assert(bk < banks); + } + else{ /* Else incorrect number of channels for the hashing function */ + assert("\nGPGPU-Sim memory_banking indexing error: The number of banks should be " + "16 for the hashing IPOLY index function.\n" && 0); + } break; } case CUSTOM_BK_INDEX: |